WO2017101875A1

WO2017101875A1 - Transmission rate control method and device based on iscsi protocol

Info

Publication number: WO2017101875A1
Application number: PCT/CN2016/110470
Authority: WO
Inventors: 刘洪军; 吴勇
Original assignee: 华为技术有限公司
Priority date: 2015-12-18
Filing date: 2016-12-16
Publication date: 2017-06-22
Also published as: CN106899510A; CN106899510B

Abstract

Disclosed is a transmission rate control method based on an iSCSI protocol. The method comprises: acquiring a session transmission rate of an iSCSI session at the current moment; determining whether the session transmission rate of the iSCSI session in the current moment is smaller than a pre-set transmission rate requirement value; and if so, adding a new TCP connection in the iSCSI session. Also disclosed is a transmission rate control device based on an iSCSI protocol. By means of the present invention, the transmission rate of an iSCSI session can be adaptively adjusted according to transmission requirements.

Description

Transmission rate control method and device based on iSCSI protocol

Technical field

The present invention relates to the field of communications, and in particular, to a transmission rate control method and apparatus based on an iSCSI protocol.

Background technique

The iSCSI (Internet Small Computer System Interface, iSCSI) technology can implement the SCSI protocol on an IP network. Users can use the current mature IP network to build a storage area network.

Referring to FIG. 1 , a system structure diagram based on the iSCSI protocol, the initiator is used as a client, the target is used as a server, the initiator and the target are transmitted through an established iSCSI session, and the iSCSI session includes one or more TCPs (Transmission Control). Protocol, Transmission Control Protocol (TCP) connection. Since the iSCSI protocol is carried over the TCP protocol, a TCP connection needs to be established before establishing an iSCSI session. IP-based iSCSI protocol transmission relies on a TCP connection, an iSCSI request sent over a TCP connection, and the corresponding response and acknowledgment response data of the iSCSI request must be returned via the same TCP connection.

When the initiator and the target end transmit data through the iSCSI session, a certain transmission resource is allocated for the iSCSI. In the subsequent transmission process, the transmission resource occupied by the iSCSI session does not change, but the amount of data between the initiator and the target end fluctuates. When it is not well adapted to the complex and variable transmission environment.

Summary of the invention

The technical problem to be solved by the embodiments of the present invention is to provide a transmission rate control method and apparatus based on the iSCSI protocol. The transfer rate of the iSCSI session can be adaptively adjusted according to the transmission requirements.

In a first aspect, an embodiment of the present application provides a transmission rate control method based on an iSCSI protocol, including:

The execution body of the embodiment of the present invention is included as a sending end, and the sending end may be an originating end or a target end in the iSCSI protocol. The sender presets the transmission rate requirement value. The transmission rate requirement value is the expected value that the iSCSI session needs to reach. The sender periodically obtains the session transmission rate of the iSCSI session at the current time, and determines whether the session transmission rate of the iSCSI session at the current time is Less than the preset transmission rate requirement value; if yes, establish a new TCP connection, allocate transmission resources for the new TCP connection, add a new TCP connection in the iSCSI session, thereby increasing the session transmission rate of the iSCSI session, enabling the iSCSI session The session transfer rate reaches the preset transfer rate demand value. If the session transmission rate at the current time is greater than or equal to the preset transmission rate requirement value, indicating that the transmission requirement is met, the sender stops adding a new TCP connection to the iSCSI session.

In a design, the sender determines whether the session transmission rate of the iSCSI session at the current time is increased compared with the previous time before determining whether the session transmission rate of the iSCSI session at the current time is less than a preset transmission rate requirement value. If yes, perform the step of determining whether the session transmission rate of the iSCSI session at the current time is less than a preset transmission rate requirement value. After the sender adds a new TCP connection to the iSCSI session at the current time, if the transmission resource (such as memory, CPU, or bandwidth) of the system is still idle, then the sender acquires the iSCSI session at the next moment, and the iSCSI session The session transfer rate will increase accordingly; if the session transfer rate of the iSCSI session does not increase at the next moment, indicating that the system's transmission resources are saturated and there is no idle, continuing to add a new TCP connection to the iSCSI session will not increase the session transfer rate. .

In another possible design, the method for the sender to obtain the session transmission rate of the iSCSI session at the current moment may be:

First, the sender determines which TCP connections are included in the iSCSI session. For each TCP connection included in the iSCSI session, the sender obtains the response message received by the TCP connection at the current time and the response message received at the previous time, according to the two responses. The timestamp and serial number of the message calculate the TCP transmission rate of the TCP connection, and the formula is specifically: S _n = (ACK _{n -} ACK _n-1 ) / (T _{n -} T _n-1 ), and ACK _n represents the current The sequence number of the response message received at the moment, ACK _n-1 indicates the sequence number of the response message received at the previous time, T _n indicates the time stamp of the response message received at the current time, and T _n-1 indicates the reception at the previous time. the response packet timestamp, S _n represents the current time of the TCP connection is a TCP transmission rate, the transmitting side according to the above formula to calculate the TCP transmission rate of the iSCSI session comprises all TCP connection, TCP transport all TCP connections The rate is summed to obtain the session transmission rate S _{n of the} iSCSI session at the current time.

In another design, after the sender obtains the session transmission rate of the iSCSI session at the current time, it needs to smooth the session transmission rate of the iSCSI session at the current moment according to the formula α×S _n-1 +β×S _n ; , α and β are constants greater than 0, α + β = 1, S _n is the session transmission rate of the current moment of the iSCSI session, and Sn _-1 is the session transmission rate of the iSCSI session at the previous moment. The historical session transmission rate is introduced, and the session transmission rate calculated at the current time is smoothed to prevent the session transmission rate from being excessively played.

In another design, when the sender needs to reduce the session transmission rate of the iSCSI session, firstly, the preset transmission rate requirement value corresponding to the ISCSI session is reduced from R1 to R2, and then the sender periodically acquires the iSCSI session at the current time. The session transmission rate of the moment, determining that the session transmission rate of the iSCSI session can continue to decrease, the method of determining may be: determining whether the session transmission rate of the iSCSI session at the current time is less than the session transmission rate of the R2 or the iSCSI session at the current time and the R2. Whether the difference is less than the TCP transmission rate of any one of the TCP connections included in the iSCSI session. If yes, it indicates that the reduction can continue. If the session transmission rate of the iSCSI session can continue to decrease, the TCP connection with the smallest absolute value of the difference between the TCP transmission rate and the T at the current moment is removed from the iSCSI session, and the transmission resource occupied by the removed TCP connection is released; T = R1 - R2.

In another possible design, the method for determining whether the session transmission rate of the iSCSI session needs to be reduced may be: determining whether the session transmission rate of the iSCSI session at the current time is less than the session transmission rate of the R2 or iSCSI session at the current moment. Whether the difference of R2 is smaller than the TCP transmission rate of any one of the TCP connections included in the iSCSI session; if so, the session transmission rate of the iSCSI session does not need to be lowered; if not, the session transmission rate of the iSCSI session needs to be lowered.

In another possible design, the sender acquires the load parameter value at the current time; When the load parameter value is greater than the preset value, the preset transmission rate demand value is decreased;

When the load parameter value is less than or equal to the preset value, the preset transmission rate demand value is increased.

In a second aspect, an embodiment of the present application provides a transmission rate control apparatus based on an iSCSI protocol, where the apparatus includes: an acquisition module, a first determination module, and an adjustment module.

The obtaining module obtains the session transmission rate of the iSCSI session at the current time, and the first determining module determines whether the session transmission rate obtained by the acquiring module is less than a preset transmission rate requirement value; if the judgment result of the first determining module is yes, the adjusting module is in the iSCSI Add a new TCP connection to the session.

In one possible design, the apparatus further includes: a second determining module.

The second determining module determines whether the session transmission rate of the current time in the iSCSI session is increased compared with the previous time. If the determination result is yes, the first determining module is instructed to start working.

In another possible design, the obtaining module determines a plurality of TCP connections included in the iSCSI session; and respectively calculates a TCP transmission rate corresponding to each of the plurality of TCP connections at the current time according to the sequence number and the timestamp of the at least two acknowledgement messages; The TCP transmission rates corresponding to the current time are summed by the plurality of TCP connections to obtain the session transmission rate S _{n of the} iSCSI session at the current time.

In another possible design, the apparatus further includes a smoothing module.

Smoothing processing module according to the formula _{α × S n-1 + β} × S n iSCSI session smoothing session transmission rate at the current time; wherein, α and beta] is greater than 0 constant, α + β = 1, S n is The session transfer rate of the current time of the iSCSI session, and Sn _-1 is the session transfer rate of the iSCSI session at the previous moment.

In another possible design, the device also includes a speed reduction module. In the case where the session transmission rate of the iSCSI session needs to be slowed down, the transmission rate requirement value corresponding to the iSCSI session is lowered, from R1 to R2, and R1>R2. The deceleration module periodically determines whether the session transmission rate of the iSCSI session continues to decrease at the current time. If yes, the TCP connection with the smallest absolute value of the difference between the TCP transmission rate and the T at the current moment is removed from the iSCSI session. And release the transmission resource occupied by the removed TCP connection; T=R1-R2.

In another possible design, the deceleration module determines whether the session transmission rate of the iSCSI session at the current time is less than R2 or whether the difference between the session transmission rate and the R2 of the iSCSI session at the current time is less than any TCP included in the iSCSI session. The TCP transmission rate of the connection; if so, there is no need to reduce the session transfer rate of the iSCSI session; if not, the session transfer rate of the iSCSI session needs to be reduced.

In another possible design, the apparatus further includes: a threshold adjustment module.

The threshold adjustment module obtains the load parameter value at the current time; when the load parameter value is greater than the preset value, decreases the preset transmission rate demand value; and when the load parameter value is less than or equal to the preset value, the pre-up is increased. Set the transmission rate demand value.

In a third aspect, an embodiment of the present application provides a terminal device, including any of the foregoing iSCSI protocol-based transmission rate control devices.

In a fourth aspect, the embodiment of the present application provides a transmission rate control apparatus based on an iSCSI protocol, including:

One or more processors, memories, bus systems, transceivers, and one or more programs, the processors, memories, and transceivers are coupled by a bus system;

One or more programs are stored in the memory, and the one or more programs include instructions that, when executed by the device, cause the device to perform any of the first aspect and the fifth possible implementation of the first aspect The method of the item.

In a fifth aspect, an embodiment of the present application provides a computer readable storage medium storing one or more programs, where one or more programs include instructions that, when executed by the device, cause the device to perform the first aspect to the first A method of any of the sixth possible implementations of aspects.

Embodiments of the present invention have the following beneficial effects:

Real-time access to the session transfer rate of the iSCSI session. When the session transfer rate is less than the preset transfer rate requirement, a new TCP connection is added to the iSCSI session to make full use of the idle transmission resources, thereby increasing the transmission rate of the iSCSI session. .

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

1 is a schematic structural diagram of a conventional transmission system based on an iSCSI protocol;

2 is a schematic flowchart of a method for controlling a transmission rate based on an iSCSI protocol according to an embodiment of the present invention;

3 is another schematic flowchart of a method for controlling a transmission rate based on an iSCSI protocol according to an embodiment of the present invention;

FIG. 4 is still another schematic flowchart of a method for controlling a transmission rate based on an iSCSI protocol according to an embodiment of the present disclosure;

5 is a schematic structural diagram of a transmission rate control apparatus based on an iSCSI protocol according to an embodiment of the present invention;

FIG. 6 is another schematic structural diagram of a transmission rate control apparatus based on an iSCSI protocol according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

2 is a method for controlling a transmission rate based on the iSCSI protocol according to an embodiment of the present invention. In the embodiment of the present invention, an execution entity is a sender, and a sender may be an initiator or a destination. , the method includes:

S201. Obtain a session transmission rate of the iSCSI session at the current moment.

Specifically, the iSCSI session includes multiple TCP connections, and the initiator is connected. A plurality of TCP connections are included in the iSCSI session to transmit a Protocol Data Unit (PDU) to the target. The current time indicates the time when the sequence number is n. For example, the initiator obtains the session transmission rate of the iSCSI session at intervals. The first acquisition time is time 1, the second acquisition time is time 2, and so on. For the current time, the session transmission rate of the initiating end to obtain the iSCSI session may be a periodic acquisition or an aperiodic acquisition, which is not limited in the present invention. Preferably, the initiator uses a periodic acquisition rate of the iSCSI session, that is, the time interval between the current time and the next time is a fixed value.

S202. Determine whether the session transmission rate of the iSCSI session at the current time is less than a preset transmission rate requirement value.

Specifically, the transmission rate requirement value indicates a transmission rate that the iSCSI session expects to reach, and a specific transmission rate requirement value is set in advance according to requirements. The initiator determines the size relationship between the session transmission rate of the current time and the preset transmission rate requirement value of the iSCCI session.

S203. If the determination result is yes, add a new TCP connection in the iSCSI session.

Specifically, in a case where the determination result in S102 is YES, the initiator re-establishes a new TCP connection, allocates a transmission resource for the new TCP connection, and adds a new TCP connection to the iSCSI session to improve the transmission rate of the iSCSI session. .

If the result of the determination in S102 is NO, the originating end does not add a new TCP connection, and exits the transmission rate control procedure of the iSCSI session.

As can be seen from the above, the session transmission rate of the iSCSI session is obtained in real time, and when the session transmission rate is less than the preset transmission rate requirement value, a new TCP connection is added in the iSCSI session, and the idle transmission resource is fully utilized. Increase the transfer rate of iSCSI sessions.

FIG. 3 is a schematic flowchart of another method for controlling a transmission rate based on the iSCSI protocol according to an embodiment of the present invention. In the embodiment of the present invention, the method includes:

S301. Determine a plurality of TCP connections included in the current time of the iSCSI session.

Specifically, the iSCSI session includes multiple TCP connections, at different times, due to The number of TCP connections included in the iSCSI session varies dynamically. Different TCP connections have different ID identities. The initiator can determine the multiple TCP connections included in the iSCSI session at the current time according to the identity of the TCP connection.

S302. Calculate, according to a sequence number and a timestamp of the at least two acknowledgement messages, a TCP transmission rate corresponding to each of the plurality of TCP connections at the current time.

Specifically, the initiator calculates a TCP transmission rate corresponding to each of the multiple TCP connections included in the iSCSI session, and the method for calculating the TCP transmission rate of the TCP connection may be: the initiator sends the protocol data unit PDU to be sent, and the initiator passes the TCP. When the connection sends the protocol data unit to the destination end, the protocol data unit carries the sequence number. When the destination end successfully receives the protocol data unit through the TCP connection, the destination end acquires the sequence number carried in the protocol data unit, and returns to the initiator to carry the sequence number. The response packet of the sequence number is received by the initiator, and the timestamp of the response packet is received, and the sequence number carried in the response packet is obtained. The initiator receives the at least two response messages, obtains the timestamp and sequence number corresponding to each response message, and calculates the TCP transmission rate of the TCP connection at the current time according to the timestamp and the sequence number: S _n =(ACK _n -ACK _N-1 )/(T _n -T _n-1 ), ACK _n represents the sequence number of the response message received at the current time, ACK _n-1 represents the sequence number of the response message received at the previous time, and T _n represents the current time stamp the received response packet, T _n-1 denotes a timing of receiving the response message timestamp, S _n represents the current time of the TCP connection is a TCP transmission rate, the above example is based on two consecutive received The sequence number and the timestamp of the response packet are used to calculate the TCP transmission rate of the TCP connection at the current time. However, the calculation method of the TCP transmission rate is not limited thereto. For example, the initiator may use the sequence number and time stamp of two or more response packets. The TCP transmission rate of the TCP connection is calculated, and the two response packets received are grouped according to the above formula, and the calculated plurality of sets of TCP transmission rates are weighted and averaged to obtain the TCP transmission speed of the TCP connection at the current time. rate.

S303. A plurality of TCP connections are respectively summed at a current TCP transmission rate at the current time to obtain a session transmission rate of the iSCSI session at the current time.

Specifically, the initiator calculates the TCP transmission rate of each TCP connection included in the iSCSI session according to the method of S302, and obtains the TCP transmission rates after summing each TCP transmission rate. The TCP transfer rate to the iSCSI session at the current time.

S304. Smooth the session transmission rate of the iSCSI session at the current time.

Specifically, the session transmission rate of the iSCSI session calculated by the initiator at the current time has a large fluctuation due to the delay confirmation mechanism of the response packet and the network congestion. In order to facilitate the calculation of the calculated session transmission rate, the initiation is initiated. The session transmission rate of the iSCSI session history is introduced to smooth the session transmission rate at the current time. The smoothing process may be: smoothing the session transmission rate of the iSCSI session at the current time according to the formula α×S _n-1 +β×S _n ; wherein α and β are constants greater than 0, α+β=1 S _n is the session transmission rate of the current time of the iSCSI session, and S _n-1 is the session transmission rate of the iSCSI session at the last moment. The values of α and β can be adjusted as needed, which is not limited in the present invention. For example, α = 0.9 and β = 0.1.

S305. Whether the session transmission rate of the iSCSI session at the current time is increased compared to the session transmission at the previous moment.

Specifically, the session transmission rate of the iSCSI session at the current moment and the session transmission rate of the previous moment are the session transmission rate after smoothing by S304, or the session transmission rate without smoothing, and the initiator determines that the iSCSI session is currently Whether the session transmission rate of the moment increases compared with the session transmission rate of the previous moment. If the judgment result is yes, indicating that the session transmission rate of the iSCSI session has a possibility of further increase, perform S306; if the judgment result is no, indicate the iSCSI session. The session transmission rate has no possibility of further increase, and S307 is performed.

S306. Whether the transmission rate of the iSCSI session at the current time is less than a preset transmission rate requirement value.

Specifically, the transmission rate requirement value is an expected value of the session transmission rate of the set iSCSI session, and a specific value may be preset according to requirements. The initiator determines whether the transmission rate of the iSCSI session obtained at S304 is less than the preset transmission rate requirement value. If the determination result is yes, indicating that the session transmission rate of the iSCSI session at the current time does not reach the expected value, the session transmission needs to be further improved. Rate; if the result of the judgment is no, the expected value is reached.

S307. Stop adding a TCP connection in the iSCSI session.

Specifically, the purpose of adding a TCP connection in an iSCSI session is to increase the session transmission rate of the iSCSI session. The session transmission rate of the iSCSI session at the current time does not increase compared with the session transmission rate at the previous moment, indicating that the network bandwidth is saturated, and continues. Adding a TCP connection to an iSCSI session does not increase its session transfer rate. The initiator stops adding a new TCP connection to the iSCSI session at this time. Or, the session transfer rate of the iSCSI session has reached the preset transmission rate requirement. The initiator also stops adding new TCP connections to the iSCSI session.

S308. Add a new TCP connection in the iSCSI session.

S301-S308 is a step of cyclic execution, and the initiator periodically performs the steps of S301 and S308 until the process is exited. When the initiator determines that a new TCP connection needs to be added in the iSCSI session, the initiator establishes a new TCP connection, allocates transmission resources for the established new TCP connection, adds the new TCP connection to the iSCSI session, and adds a new TCP connection. Thereafter, the number of TCP connections in the iSCSI session increases, and when the next time is reached, the initiator continues to perform S301-S308 according to the above description.

FIG. 4 is still another schematic flowchart of a method for controlling a transmission rate based on an iSCSI protocol according to an embodiment of the present invention. In the embodiment of the present invention, the method includes:

S401. Determine a plurality of TCP connections included in the current time of the iSCSI session.

Specifically, the iSCSI session includes multiple TCP connections. At different times, the number of TCP connections included in the iSCSI session changes dynamically due to different transmission requirements. Different TCP connections have different ID identities, and the initiator can be based on The identity of the TCP connection determines the number of TCP connections included in the iSCSI session at the current time.

S402. Calculate, according to a sequence number and a timestamp of the at least two acknowledgement messages, a TCP transmission rate corresponding to each of the plurality of TCP connections at the current time.

Specifically, the initiator calculates a TCP transmission rate corresponding to each of the multiple TCP connections included in the iSCSI session, and the method for calculating the TCP transmission rate of the TCP connection may be: the initiator sends the protocol data unit PDU to be sent, and the initiator transmits the TCP. When the connection sends the protocol data unit to the destination end, the protocol data unit carries the sequence number. When the destination end successfully receives the protocol data unit through the TCP connection, the destination end acquires the sequence number carried in the protocol data unit, and returns to the initiator to carry the sequence number. The response packet of the sequence number is received by the initiator, and the timestamp of the response packet is received, and the sequence number carried in the response packet is obtained. The initiator receives the at least two response messages, obtains the timestamp and sequence number corresponding to each response message, and calculates the TCP transmission rate of the TCP connection at the current time according to the timestamp and the sequence number: S _n =(ACK _n -ACK _N-1 )/(T _n -T _n-1 ), ACK _n represents the sequence number of the response message received at the current time, ACK _n-1 represents the sequence number of the response message received at the previous time, and T _n represents the current time stamp the received response packet, T _n-1 denotes a timing of receiving the response message timestamp, S _n represents the current time of the TCP connection is a TCP transmission rate, the above example is based on two consecutive received The sequence number and the timestamp of the response packet are used to calculate the TCP transmission rate of the TCP connection at the current time. However, the calculation method of the TCP transmission rate is not limited thereto. For example, the initiator may use the sequence number and time stamp of two or more response packets. The TCP transmission rate of the TCP connection is calculated, and the two response packets received are grouped according to the above formula, and the calculated plurality of sets of TCP transmission rates are weighted and averaged to obtain the TCP transmission speed of the TCP connection at the current time. rate.

S403. A plurality of TCP connections are respectively summed at a current TCP transmission rate corresponding to the current time to obtain a session transmission rate of the iSCSI session at the current time.

Specifically, the initiator calculates the TCP transmission rate of each TCP connection included in the iSCSI session according to the method of S402, and sums the respective TCP transmission rates to obtain the TCP transmission rate of the iSCSI session at the current time.

S404. Whether the session transmission rate of the iSCSI session continues to decrease at the current time.

Specifically, multiple TCP connections included in an iSCSI session may be created when the system load is reduced, which occupies more transmission resources. If a new iSCSI session needs to be created, the new iSCSI session may be allocated. Sufficient transmission resources. In this case, some TCP connections in the original iSCSI session need to be removed, so that the transmission rate requirement of the original iSCSI session is reduced from R1 to R2, and R1>R2.

The initiator of the iSCSI session determines whether the transmission rate of the iSCSI session at the current time needs to be lowered. If the determination result is yes, S405 is performed, and if the determination result is no, S407 is performed. The method for determining whether the session transmission rate of the current time needs to be reduced is: determining whether the session transmission rate of the iSCSI session at the current time is less than R2 or whether the difference between the session transmission rate and the R2 of the iSCSI session at the current time is less than the The TCP transmission rate of any one of the TCP connections included in the iSCSI session; if yes, the session transmission rate of the iSCSI session at the current time has met the requirement of the transmission rate requirement value R2, and does not need to adjust the session transmission rate of the iSCSI session; No, the session transmission rate of the iSCSI session at the current time does not meet the requirement of the transmission rate requirement value R2, and the session transmission rate of the iSCSI session needs to be adjusted.

S405. Select a TCP connection in the iSCSI session to remove.

Specifically, the TCP connection that minimizes the absolute value of the difference between the TCP transmission rate and the T at the current time is removed from the iSCSI session by T=R1-R2.

S406. Release the transmission resource occupied by the removed TCP connection.

Specifically, the transmission resource includes one or more of a CPU resource, a memory resource, and a bandwidth resource.

S407. Stop removing the TCP connection included in the iSCSI session.

Optionally, in some embodiments of the present invention, acquiring a load parameter value at a current time;

When the load parameter value is greater than a preset value, reducing the preset transmission rate demand value;

And adding, in the case that the load parameter value is less than or equal to the preset value, the preset transmission rate requirement value.

Wherein, the load parameter value indicates the parameter value of the load degree of the system, and the magnitude of the load parameter value and the load degree are positively correlated. When the load parameter value is greater than the preset value, the initiator needs to reduce the session transmission rate of the iSCSI session, minus Small corresponding to the iSCSI session The transmission rate requirement value is used to reduce the load of the system. When the load parameter value is less than or equal to the preset value, the initiator needs to increase the transmission rate of the iSCSI session and increase the preset transmission rate requirement value to improve the system transmission resource. Utilization. After changing the transmission rate requirement value of the iSCSI session, the transmission rate of the iSCSI session is adjusted to the adjusted transmission rate requirement value according to the method of the foregoing embodiment.

5 is a schematic structural diagram of a transmission rate control apparatus based on an iSCSI protocol according to an embodiment of the present invention. Hereinafter, the apparatus is used to perform an iSCSI-based protocol shown in FIG. 1 . A transmission rate control method, in which the examples and terms involved may refer to the description of FIG. 2. The device 5 includes an acquisition module 501, a first determination module 502, and an adjustment module 503.

The obtaining module 501 is configured to obtain a session transmission rate of the iSCSI session at the current moment.

The first determining module 502 is configured to determine whether the session transmission rate obtained by the acquiring module is less than a preset transmission rate requirement value.

The adjusting module 503 is configured to add a new TCP connection in the iSCSI session if the determining result of the first determining module is yes.

The embodiment of the present invention and the method embodiment 1 are based on the same concept, and the technical effects thereof are also the same. For the specific principle, reference may be made to the description of the method embodiment 1 in FIG. 2, and details are not described herein again.

Optionally, the device 5 further includes: a first determining module.

a second determining module, configured to determine whether the session transmission rate of the iSCSI session at the current time is increased compared with the previous time,

If the determination result of the second determining module is yes, the first determining module is instructed to start working.

Optionally, the obtaining module 501 is configured to:

Determining a plurality of TCP connections included in the iSCSI session;

Calculating, according to a sequence number and a timestamp of the at least two acknowledgement messages, a TCP transmission rate corresponding to each of the multiple TCP connections at the current time;

The plurality of TCP connections are each summed at a current TCP transmission rate corresponding to the current time to obtain a session transmission rate S _{n of} the iSCSI session at the current time.

Optionally, the device 5 further includes: a smoothing processing module.

a smoothing processing module, configured to smooth a session transmission rate of the iSCSI session at a current time according to a formula α×S _n-1 +β×S _n ; wherein α and β are constants greater than 0, α+β= 1, S _n is the session transmission rate of the current moment of the iSCSI session, and Sn _-1 is the session transmission rate of the iSCSI session at the previous moment.

Optionally, the device 5 further includes: a speed reduction module.

a speed reduction module, configured to determine whether the session transmission rate of the iSCSI session continues to decrease at a current time; wherein, the transmission rate requirement value corresponding to the iSCSI session is previously reduced from R1 to R2;

If yes, the TCP connection with the smallest absolute value of the difference between the TCP transmission rate and the T at the current moment is removed from the iSCSI session, and the transmission resource occupied by the removed TCP connection is released; T=R1 -R2.

Optionally, the speed reduction module is used to:

Determining whether the session transmission rate of the iSCSI session at the current time is less than R2 or whether the difference between the session transmission rate and the R2 of the iSCSI session at the current time is less than a TCP transmission rate of any one of the TCP connections included in the iSCSI session;

If yes, there is no need to reduce the session transfer rate of the iSCSI session;

If not, the session transfer rate of the iSCSI session needs to be reduced.

Optionally, the device 5 further includes: a threshold adjustment module.

a threshold adjustment module, configured to acquire a load parameter value at a current time; and if the load parameter value is greater than a preset value, reduce the preset transmission rate demand value; where the load parameter value is less than or equal to In the case of the preset value, the preset transmission rate demand value is increased.

Embodiments 2 and 3 of the present invention are based on the same concept, and the technical effects thereof are also the same. For the specific principles, reference may be made to the description of the embodiment of FIG. 3 and FIG. 4, and details are not described herein again.

FIG. 6 is another schematic structural diagram of a transmission rate control apparatus based on an iSCSI protocol according to an embodiment of the present invention. Hereinafter, the apparatus 6 includes a processor 601, a memory 602, and a transceiver 603. The transceiver 603 is configured to transmit and receive data with and from an external device. The number of processors 601 in device 6 may be one or more. The invention In some embodiments, processor 601, memory 602, and transceiver 603 can be connected by a bus system or other means. Apparatus 6 can be used to perform the method illustrated in FIG. For the meaning and examples of the terms involved in the embodiment, reference may be made to the corresponding embodiment of FIG. 2. I will not repeat them here.

The program code is stored in the memory 602. The processor 601 is configured to call the program code stored in the memory 602 for performing the following operations:

Obtain the session transmission rate of the iSCSI session at the current time;

Determining whether the session transmission rate of the iSCSI session at the current time is less than a preset transmission rate requirement value;

If so, add a new TCP connection to the iSCSI session.

In some embodiments of the present invention, the processor 601 performs the determining whether the session transmission rate of the iSCSI session at the current time is less than a preset transmission rate requirement value, and is further configured to:

Determining whether the session transmission rate of the iSCSI session at the current time is increased compared with the previous time,

If yes, performing the step of determining whether the session transmission rate of the iSCSI session at the current time is less than a preset transmission rate requirement value.

In some embodiments of the present invention, the performing, by the processor 601, the session transmission rate of the acquiring the iSCSI session at the current moment includes:

Determining a plurality of TCP connections included in the iSCSI session;

In some embodiments of the present invention, the processor 601 performs the acquiring the iSCSI session at the current time of the session transmission rate, and is further configured to:

Smoothing the session transmission rate of the iSCSI session at the current time according to the formula α×S _n-1 +β×S _n ; wherein α and β are constants greater than 0, α+β=1, and S _n is The session transmission rate of the iSCSI session at the current moment, and Sn _-1 is the session transmission rate of the iSCSI session at the previous moment.

In some embodiments of the present invention, the processor 601 is further configured to:

Determining whether the session transmission rate of the iSCSI session continues to decrease at the current time; wherein the transmission rate requirement value corresponding to the iSCSI session is previously lowered from R1 to R2;

In some embodiments of the present invention, the processor 601 performing the determining whether the session transmission rate of the iSCSI session at the current moment continues to decrease includes:

If not, the session transfer rate of the iSCSI session needs to be reduced.

Obtain the load parameter value at the current time;

One of ordinary skill in the art can understand that all or part of the process of implementing the foregoing embodiments can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable storage medium. When executed, the flow of an embodiment of the methods as described above may be included. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

The above disclosure is only a preferred embodiment of the present invention, and of course, the scope of the present invention is not limited thereto, and those skilled in the art can understand all or part of the process of implementing the above embodiments, and according to the present invention. The equivalent changes required are still within the scope of the invention.

Claims

A transmission rate control method based on the iSCSI protocol, comprising:

Obtaining the session transmission rate of the iSCSI session of the Internet small computer system interface at the current time;

Determining whether the session transmission rate of the iSCSI session at the current time is less than a preset transmission rate requirement value;

If so, a new Transmission Control Protocol TCP connection is added to the iSCSI session.
The method of claim 1, wherein the determining whether the session transmission rate of the iSCSI session at the current time is less than a preset transmission rate requirement value further includes:

Determining whether the session transmission rate of the iSCSI session at the current time is increased compared with the previous time,

If yes, performing the step of determining whether the session transmission rate of the iSCSI session at the current time is less than a preset transmission rate requirement value.
The method according to claim 1 or 2, wherein the obtaining the session transmission rate of the Internet small computer system interface iSCSI session at the current time comprises:

Determining a plurality of TCP connections included in the iSCSI session;

Calculating, according to a sequence number and a timestamp of the at least two acknowledgement messages, a TCP transmission rate corresponding to each of the multiple TCP connections at the current time;

The plurality of TCP connections are each summed at a current TCP transmission rate corresponding to the current time to obtain a session transmission rate S n of the iSCSI session at the current time.
The method of claim 3, wherein the obtaining the Internet small computer system interface iSCSI session after the current session transmission rate further comprises:

Smoothing the session transmission rate of the iSCSI session at the current time according to the formula α×S n-1 +β×S n ; wherein α and β are constants greater than 0, α+β=1, and S n is The session transmission rate of the iSCSI session at the current moment, and Sn -1 is the session transmission rate of the iSCSI session at the previous moment.
The method of claim 1 further comprising:

Determining whether the session transmission rate of the iSCSI session continues to decrease at the current time; wherein the transmission rate requirement value corresponding to the iSCSI session is previously lowered from R1 to R2;

If yes, the TCP connection with the smallest absolute value of the difference between the TCP transmission rate and the T at the current moment is removed from the iSCSI session, and the transmission resource occupied by the removed TCP connection is released; T=R1 -R2.
The method of claim 5, wherein the determining whether the session transmission rate of the iSCSI session at the current time continues to decrease comprises:

Determining whether the session transmission rate of the iSCSI session at the current time is less than R2 or whether the difference between the session transmission rate and the R2 of the iSCSI session at the current time is less than a TCP transmission rate of any one of the TCP connections included in the iSCSI session;

If yes, there is no need to reduce the session transfer rate of the iSCSI session;

If not, the session transfer rate of the iSCSI session needs to be reduced.
The method of any of claims 1-6, further comprising:

Obtain the load parameter value at the current time;

When the load parameter value is greater than a preset value, reducing the preset transmission rate demand value;

And adding, in the case that the load parameter value is less than or equal to the preset value, the preset transmission rate requirement value.
A transmission rate control device based on the iSCSI protocol, comprising:

An obtaining module, configured to acquire a session transmission rate of an iSCSI session at a current time;

a first determining module, configured to determine whether a session transmission rate obtained by the acquiring module is less than a preset transmission rate requirement value;

And an adjustment module, configured to add a new TCP connection in the iSCSI session if the determination result of the first determining module is yes.
The device of claim 8 further comprising:

a second determining module, configured to determine whether the session transmission rate of the iSCSI session at the current time is increased compared with the previous time,

If the determination result of the second determining module is yes, the first determining module is instructed to start working.
The method according to claim 8 or 9, wherein the obtaining module is configured to:

Determining a plurality of TCP connections included in the iSCSI session;

Calculating, according to a sequence number and a timestamp of the at least two acknowledgement messages, a TCP transmission rate corresponding to each of the multiple TCP connections at the current time;

The plurality of TCP connections are each summed at a current TCP transmission rate corresponding to the current time to obtain a session transmission rate S n of the iSCSI session at the current time.
The method of claim 10, further comprising:

a smoothing processing module, configured to smooth a session transmission rate of the iSCSI session at a current time according to a formula α×S n-1 +β×S n ; wherein α and β are constants greater than 0, α+β= 1, S n is the session transmission rate of the current moment of the iSCSI session, and Sn -1 is the session transmission rate of the iSCSI session at the previous moment.
The device of claim 8 further comprising:

a speed reduction module, configured to determine whether a session transmission rate of the iSCSI session continues to decrease at a current time; wherein, the transmission rate requirement value corresponding to the iSCSI session is pre- R1 is reduced to R2;

If yes, the TCP connection with the smallest absolute value of the difference between the TCP transmission rate and the T at the current moment is removed from the iSCSI session, and the transmission resource occupied by the removed TCP connection is released; T=R1 -R2.
The apparatus of claim 12 wherein said speed reduction module is for:

Determining whether the session transmission rate of the iSCSI session at the current time is less than R2 or whether the difference between the session transmission rate and the R2 of the iSCSI session at the current time is less than a TCP transmission rate of any one of the TCP connections included in the iSCSI session;

If yes, there is no need to reduce the session transfer rate of the iSCSI session;

If not, the session transfer rate of the iSCSI session needs to be reduced.
The device of any of claims 7-13, further comprising:

a threshold adjustment module, configured to acquire a load parameter value at a current time; and if the load parameter value is greater than a preset value, reduce the preset transmission rate demand value; where the load parameter value is less than or equal to In the case of the preset value, the preset transmission rate demand value is increased.