CN106027412A - TCP (Transmission Control Protocol) congestion control method based on congestion queue length - Google Patents
TCP (Transmission Control Protocol) congestion control method based on congestion queue length Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/26—Flow control; Congestion control using explicit feedback to the source, e.g. choke packets
- H04L47/263—Rate modification at the source after receiving feedback
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/19—Flow control; Congestion control at layers above the network layer
- H04L47/193—Flow control; Congestion control at layers above the network layer at the transport layer, e.g. TCP related
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/27—Evaluation or update of window size, e.g. using information derived from acknowledged [ACK] packets
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Abstract
The invention discloses a TCP (Transmission Control Protocol) congestion control method based on a congestion queue length for use in a data center SDN (Software Defined Networking) environment. The method comprises the following steps that: a queue management module monitors a queue length of a switch port; when the queue length exceeds a certain threshold, a current network is considered to be in a congestion state, and congestion announcement information is transmitted to a controller through an SDN/OpenFlow protocol; after the controller receives the information, a flow table is issued to a switch, and an ACK (Acknowledgement) message reversely flowing through the port is modified in order that the ACK message carries queue length information of a network congestion point; and after a transmitting end receives the ACK message, the transmission rate of the transmitting end is lowered according to the queue length information in the ACK message in order to relieve network congestion. According to the method, a congestion degree is represented by direct feedback at the network congestion point, so that the problem of data center network congestion can be solved effectively, and the network throughput is increased. Meanwhile, an SDN/OpenFlow technology is utilized in the method, so that the method is more flexible and efficient.
Description
Technical field
The invention belongs to TCP jamming control method, under particularly a kind of data center SDN architecture environment, base
TCP jamming control method in congested queue length.
Background technology
Transmission Control Protocol is one of two kinds of agreements that computer network transport layer uses, it provide connection-oriented, can
The data transport service leaned on, and wherein TCP jamming control method is the core of Transmission Control Protocol.But, pass
The TCP congestion avoidance algorithm of system is Internet environment and designs generation, in current data central site network
Under environment, use traditional TCP jamming control method that network performance can be made drastically to decline.Therefore, it is necessary to
Design meets the TCP Congestion control protocol of data center network feature.
Currently, the TCP jamming control method for data center network environment has a lot, from judging congested position
From the perspective of, can be divided three classes:
1) the congested judgement of transmitting terminal.This method is to use most common congestion control mechanism, most typical generation
Table is conventional TCP congestion control mechanism (TCP Tahoe, TCP Reno, TCP New Reno), this mechanism
Congested criterion be that transmitting terminal receives three repeat ACK messages.Additionally also by sending the past of data
Return the time (Round-Trip Time, RTT) as judging congested standard, such as TCP Vegas, DC-Vegas
With TIMELY etc..(1.Jacobson,V.,Congestion Avoidance and Control,Computer
Communication Review,vol.18,no.4,pp.314-329,Aug.1988.2.Jacobson,V.,
Modified TCP Congestion Avoidance Algorithm,end2end-interest mailing list,April
30,1990.3.Sally Floyd and Tom Henderson.The NewReno modificatian to TCP’s
fast recovery algorithm.RFC 2582,April 1999.4.Brakmo LS,O'Malley SW,
Peterson LL.TCP Vegas:new techniques for congestion detection and avoidance.
Proceedings of ACM SIGCOMM 2002,p.24–35,1994.5.Jingyuan Wang,Jiangtao
Wen,Chao Li,Zhang Xiong,Yuxing HanDC-Vegas:A delay-based TCP congestion
control algorithm for datacenter applications,Journal of Network and Computer
Applications,53,pp.103-114,2015.6.Radhika Mittal,Vinh The Lam,Nandita
Dukkipati,etc.TIMELY:RTT-based Congestion Control for the Datacenter,
Proceeding of SIGCOMM’15,August 17-21,London,United Kingdom,pp.537-550,
2015.).The advantage of this method is the existing attribute utilized in Transmission Control Protocol, it is achieved relatively simple, but
Transmitting terminal judges that congested method accuracy is the highest, or needs to repair the tcp protocol stack of present terminal
Changing, utilization cost is higher.
2) network side judges congested.This method is most typical for DCTCP with D2TCP, these mechanism exist
When switch queue length exceedes threshold value, the method labelling of ECN is used to exceed the message of threshold value, transmitting terminal root
Adjusting congestion window size according to the ratio of labeled data message, labeled ratio is the biggest, and the amplitude of reduction is more
Greatly.(7.Alizadeh,M.,Greenberg,A.,Greenberg,Maltz,D.,etc.Data center TCP
(DCTCP).Proceedings of SIGCOMM 2010,NEW DELHI,INDIA,30August-3
September,pp.63-74.ACM,New York,NY,USA.8.B.Vamanan,J.Hasan,T.N.
Vijaykumar,Deadline-aware datacenter tcp,In Proc.of ACM SIGCOMM conference
on Applications,technologies,architectures,and protocols for computer
communication,New York,NY,USA,2012,pp.115-126.).Network side judges congested method
Directly judging congested by the queue situation of switch, the accuracy of the most congested judgement increases, but this
Planting ECN labeling method have to switch support.
3) receiving terminal judges congested.The representative achievements of this method is ICTCP, and ICTCP is according to receiving terminal
TCP connection, it is judged that Congestion Level SPCC, each TCP of active accommodation connect reception window size,
Thus avoid the generation of network congestion.(9.Wu,H.,Feng,Z.,Guo,C.and Zhang,Y.ICTCP:
Incast Congestion Control for TCP in Data Center Networks.Proceedings of
CoNEXT 2010,Philadelphia,PA,30November-03December,pp.13.ACM,New
York,NY,USA.).This method can effectively solve the problem that network congestion problem, but it is disadvantageous in that
Being suitable for scene limited, the most congested generation just can tell on the switch of receiving terminal time.
Summary of the invention
It is an object of the invention under data center network SDN framework, utilize and congested switch queue occurs
Length is as the foundation of adjustment congestion window, and this design TCP jamming control method, thus solves network
Congestion problems.
The technical solution realizing the object of the invention is: a kind of TCP congestion control based on congested queue length
Method, the method is applied to meet in the data center network of SDN framework, this network environment comprise transmitting terminal,
Switch, SDN controller node, above-mentioned transmitting terminal is all connected with switch with SDN controller node,
And between them, carry out data transmission, SDN controller and inter-exchange use OpenFlow agreement；The method
Specifically include following steps:
Step 1, switch queue is managed, particularly as follows: the switch in network monitors switch in real time
Port queue length, when queue length exceedes the threshold value of setting, namely when network is in congested, switch to
SDN controller sends congestion notification information, and this congestion notification information includes congested switch numbering letter
Breath and congested port numbering information；Otherwise, process according to normal switch queue administrative mechanism；
After step 2, SDN controller node receive congestion notification information, send stream to there is congested switch
Table, the interface that enters of this stream table is that congested switch ports themselves number occurs, and the Actions item of stream table is amendment ACK
Message action；
Step 3, processing message, after new stream table arrives switch, switch is according to step 2
Stream table, increases current queue size information to the ACK message meeting this stream table；
After step 4, transmitting terminal receive ACK message, after recalculating congestion window, adjust the transmission of transmitting terminal
Speed, completes the congested process of TCP of current period, returns step 1 afterwards and carries out the congested of next cycle
Process.
Compared with prior art, its remarkable advantage is the present invention: the method for (1) present invention directly utilizes network and sends out
Raw congested switch queue length information characterizes congested degree, therefore judges that congested accuracy is higher；
(2) when switch queue length exceedes the threshold value of setting, SDN/OpenFlow technology is utilized to control to SDN
Device processed sends congestion notification message, issues stream table subsequently so that switch adds queue from trend ACK message
Length information, therefore, the motility of the present invention is higher, and autgmentability is higher, can be according to concrete requirement definition
Threshold information；(3) present invention the most directly uses the rate of change of switch queue length to adjust congestion window,
In hgher efficiency, effect is more preferable.
Below in conjunction with the accompanying drawings the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the application scenarios of the present invention.
Fig. 2 is the flow chart of present invention TCP based on queue length jamming control method.
Fig. 3 switch status transition figure.
Fig. 4 switch end data process chart.
Fig. 5 amended ACK message.
Detailed description of the invention
In conjunction with Fig. 1, a kind of based on congested queue length the TCP jamming control method of the present invention, the method should
In the data center network meeting SDN framework, this network environment comprises transmitting terminal, switch, SDN
Controller node, above-mentioned transmitting terminal is all connected with switch with SDN controller node, and enters between them
Row data are transmitted, and SDN controller and inter-exchange use OpenFlow agreement；The method specifically includes following
Step:
Step 1, switch queue is managed, particularly as follows: the switch in network monitors switch in real time
Port queue length, when queue length exceedes the threshold value of setting, namely when network is in congested, switch to
SDN controller sends congestion notification information, and this congestion notification information includes congested switch numbering letter
Breath and congested port numbering information；Otherwise, process according to normal switch queue administrative mechanism；To friendship
Queue of changing planes be managed particularly as follows:
The queue length of step 1-1, in real time monitoring switch ports themselves, is designated as Q by current queue sizecur；
Step 1-2, judge whether current queue size exceedes threshold k, work as QcurDuring ＜ K, represent at switch
In normal condition NOR, current SWITCH state State=NOR is set, according to normal switch queue pipe
Reason mechanism processes；Otherwise, step 1-3 is entered；
Step 1-3, as K≤Qcur≤QmaxTime, wherein QmaxFor the greatest length of queue, represent switch
It is in congestion state CNG, current SWITCH state State=CNG is set, and enters step 1-4；Otherwise enter
Enter step 1-5；
Step 1-4, utilize OpenFlow protocol generation Packet_In message, and congested port numbers will occur
With switch identification as the data division of Packet_In message, this message is sent to SDN controller；
Step 1-5, work as Qcur＞ Qmax, switch abandons the data message entering this port.
After step 2, SDN controller node receive congestion notification information, send stream to there is congested switch
Table, the interface that enters of this stream table is that congested switch ports themselves number occurs, and the Actions item of stream table is amendment ACK
Message action；
Step 3, processing message, after the stream table of step 2 arrives switch, switch is according to this stream
Table, increases current queue size information to the ACK message meeting stream table；To the ACK message meeting stream table
Increase current queue size information, specifically comprise the following steps that
Step 3-1, when data message arrive there is congested switch ports themselves time, it is judged that present port queue
State, if state State is CNG, then enters step 3-2, otherwise, enters step 3-7；
Step 3-2, check whether this message is ACK message, if this message is not ACK message, then enter
Enter step 3-7, otherwise, enter step 3-3；
Step 3-3, from this ACK message, extract congestion flag field be entered as CN, extract ACK simultaneously
The value of the queue length field in message is also entered as Qack, enter step 3-4；Described CN represents congested mark
Will, QackRepresent the summation of congested queue length on transmission path；
Step 3-4, judge whether congestion flag is 1, if 1, then it represents that have other in this data flow path
Congestion point, enter step 3-6, otherwise enter step 3-5；
Step 3-5, network congestion field CN=1 of ACK message is set, assignment Qack=0, enter step
3-6；
Step 3-6, the value arranging ACK message queue length are Qcur+Qack, subsequently enter step 3-7；
Step 3-7, message normal process and forwarding.
After step 4, transmitting terminal receive ACK message, after recalculating congestion window, adjust the transmission of transmitting terminal
Speed, completes the congested process of TCP of current period, returns step 1 afterwards and carries out the congested of next cycle
Process.The transmission rate adjusting transmitting terminal after calculating congestion window specifically comprises the following steps that
Step 4-1, when receiving ACK message, extract the CN field in this message, if CN field
It is 1, then enters step 4-2, otherwise, enter step 4-5；
Step 4-2, from ACK message extract queue length field, be entered as QackIf, Qack<QminOr
Person Qack>Qmax, then enter step 4-3, otherwise, enter step 4-4；Above-mentioned QminAnd QmaxFor algorithm
The minimum and maximum queue length value of record in running；
If step 4-3 Qack<Qmin, then Qmin=Qack, Q else ifack>Qmax, then
Qmax=Qack, enter step 4-4 afterwards；
Step 4-4, compare QackAnd Qlast, wherein QlastRepresent and received the queue length in ACK message last time,
If Qack≤Qlast, then congestion window cwnd is constant, adjusts the most as follows,
cwndnew=(1-α/2) * cwndold
Wherein, α=(1-g) * α+g*R,Δ=Qmax-Qmin, g is [0,1]
A factor, cwndoldRepresent the congestion window in last cycle, Q is set subsequentlylast=Qack, enter step
Rapid 4-6；
Step 4-5, according to original Transmission Control Protocol calculate cwndnew；Enter step 4-6；
Step 4-6, according to cwndnewSend data, cwnd is set subsequentlyold=cwndnew。
The method of the present invention characterizes congested degree not only by the directly feedback utilizing network congestion point, permissible
The effective data center network congestion problems that solves, raising network throughput, this process employs simultaneously
SDN/OpenFlow technology so that the present invention is more flexibly with efficient.
Below in conjunction with embodiment, the present invention is done further detailed description.
Embodiment
In conjunction with Fig. 1 and Fig. 2, present invention TCP based on congested queue length jamming control method, step is as follows:
The first step as it is shown on figure 3, switch use tail drop Queue Management Algorithm process, switch
Monitor port queue length in real time, when the queue length that switch ports themselves number is 1 is 70KB, exceed threshold k
(in this example, we take the half that K is queue length, 64KB), switch is in congestion state, switch
Sending congestion notification information to SDN controller, this congestion notification information includes congested switch identification
With port numbers 1.
After second step, SDN controller receive congestion notification information, send new stream to there is congested switch
Table, the entrance interface end slogan 1 of this stream table, the Actions of stream table points to amendment ACK message action；
3rd step, as shown in Figure 4, when data message arrives No. 1 port of switch, now switch ports themselves
It is in congestion state, specifically comprises the following steps that
A () checks data message type, if not ACK message, then process by normal flow, otherwise
From ACK, propose the value of congestion flag field, extract the queue length word in ACK message simultaneously
The value of section, as it is shown in figure 5, in this example embodiment, congestion flag CN field is ACK message format
0, queue length is also 0, represents do not have other congested generation on path before this；
B () arranges ACK packet congestion field is 1, arranges the queue length field of ACK message for working as
Value 70KB of front queue length.
(c) message normal process and forwarding.
4th step, after transmitting terminal receives this ACK message, the congestion field extracted in message is 1 and team
Row length Qack=70KB, specifically comprises the following steps that
The Q of (a) currently transmitted end recordmin=65KB, Qmax=95KB, therefore need not more cenotype
The Q answeredmin, or Qmax。
B () judges QackWith QlastSize, the Q of currently transmitted endlast=67KB, therefore by following public
Formula adjusts,
cwndnew=(1-α/2) * cwndold
Wherein, α=(1-g) * α+g*R,Δ=Qmax-Qmin, g takes
Value is 0.5, and existing α is 0.4, cwndold=8
Δ=30KB can be calculated according to known conditions,α=0.5*0.4+
0.5*0.1=0.25, finally draws cwndnew=(1-0.125) * 8=7
C () is according to cwndnew=7 send data, arrange cwnd subsequentlyold=cwndnew=7.
From the foregoing, it will be observed that this method can be directly according to the congestion window of the length adjustment transmitting terminal of switch congestion queue
Mouthful, in this example, congested serious time (queue length exceedes threshold value 5KB size), under congestion window is slight
Fall (will be 7 from original 8), therefore while transfer rate slightly decreases, can alleviate again switch
Queue length.When congested serious time, transmitting terminal congestion window declines relatively big, and switch queue length declines also
More, it is to avoid congested deterioration.Therefore, this method has the congested accuracy of higher judgement so that transmitting terminal energy
Enough adjust transmission rate more efficiently, under the conditions of ensureing self reasonable transmission rate, it is possible to effectively alleviate friendship
Change planes the generation of queue congestion, finally improve network throughput.
Claims (4)
1. a TCP jamming control method based on congested queue length, it is characterised in that the method is applied
In the data center network meeting SDN framework, this network environment comprises transmitting terminal, switch, SDN control
Device node processed, above-mentioned transmitting terminal is all connected with switch with SDN controller node, and carries out between them
Data are transmitted, and SDN controller and inter-exchange use OpenFlow agreement；The method specifically includes following step
Rapid:
Step 1, switch queue is managed, particularly as follows: the switch in network monitors switch in real time
Port queue length, when queue length exceedes the threshold value of setting, namely when network is in congested, switch to
SDN controller sends congestion notification information, and this congestion notification information includes congested switch numbering letter
Breath and congested port numbering information；Otherwise, process according to normal switch queue administrative mechanism；
After step 2, SDN controller node receive congestion notification information, send stream to there is congested switch
Table, the interface that enters of this stream table is that congested switch ports themselves number occurs, and the Actions item of stream table is amendment ACK
Message action；
Step 3, processing message, after the stream table of step 2 arrives switch, switch is according to this stream
Table, increases current queue size information to the ACK message meeting stream table；
After step 4, transmitting terminal receive ACK message, after recalculating congestion window, adjust the transmission of transmitting terminal
Speed, completes the congested process of TCP of current period, returns step 1 afterwards and carries out the congested of next cycle
Process.
TCP jamming control method based on congested queue length the most according to claim 1, its feature
Be, switch queue is managed by step 1 particularly as follows:
The queue length of step 1-1, in real time monitoring switch ports themselves, is designated as Q by current queue sizecur；
Step 1-2, judge whether current queue size exceedes threshold k, work as Qcur< during K, represent at switch
In normal condition NOR, current SWITCH state State=NOR is set, according to normal switch queue pipe
Reason mechanism processes；Otherwise, step 1-3 is entered；
Step 1-3, as K≤Qcur≤QmaxTime, wherein QmaxFor the greatest length of queue, represent switch
It is in congestion state CNG, current SWITCH state State=CNG is set, and enters step 1-4；Otherwise enter
Enter step 1-5；
Step 1-4, utilize OpenFlow protocol generation Packet_In message, and congested port numbers will occur
With switch identification as the data division of Packet_In message, this message is sent to SDN controller；
Step 1-5, work as Qcur>Qmax, switch abandons the data message entering this port.
TCP jamming control method based on congested queue length the most according to claim 1, its feature
Being, step 3 increases current queue size information to the ACK message meeting stream table, specifically comprises the following steps that
Step 3-1, when data message arrive there is congested switch ports themselves time, it is judged that present port queue
State, if state State is CNG, then enters step 3-2, otherwise, enters step 3-7；
Step 3-2, check whether this message is ACK message, if this message is not ACK message, then enter
Enter step 3-7, otherwise, enter step 3-3；
Step 3-3, from this ACK message, extract congestion flag field be entered as CN, extract ACK simultaneously
The value of the queue length field in message is also entered as Qack, enter step 3-4；Described CN represents congested mark
Will, QackRepresent the summation of congested queue length on transmission path；
Step 3-4, judge whether congestion flag is 1, if 1, then it represents that have other in this data flow path
Congestion point, enter step 3-6, otherwise enter step 3-5；
Step 3-5, network congestion field CN=1 of ACK message is set, assignment Qack=0, enter step
3-6；
Step 3-6, the value arranging ACK message queue length are Qcur+Qack, subsequently enter step 3-7；
Step 3-7, message normal process and forwarding.
TCP jamming control method based on congested queue length the most according to claim 1, its feature
Being, the transmission rate adjusting transmitting terminal after calculating congestion window in step 4 specifically comprises the following steps that
Step 4-1, when receiving ACK message, extract the CN field in this message, if CN field
It is 1, then enters step 4-2, otherwise, enter step 4-5；
Step 4-2, from ACK message extract queue length field, be entered as QackIf, Qack<QminOr
Person Qack>Qmax, then enter step 4-3, otherwise, enter step 4-4；Above-mentioned QminAnd QmaxFor algorithm
The minimum and maximum queue length value of record in running；
If step 4-3 Qack<Qmin, then Qmin=Qack, Q else ifack>Qmax, then
Qmax=Qack, enter step 4-4 afterwards；
Step 4-4, compare QackAnd Qlast, wherein QlastRepresent and received the queue length in ACK message last time,
If Qack≤Qlast, then congestion window cwnd is constant, adjusts the most as follows,
cwndnew=(1-α/2) * cwndold
Wherein, α=(1-g) * α+g*R,Δ=Qmax-Qmin, g is [0,1]
A factor, cwndoldRepresent the congestion window in last cycle, Q is set subsequentlylast=Qack, enter step
Rapid 4-6；
Step 4-5, according to original Transmission Control Protocol calculate cwndnew；Enter step 4-6；
Step 4-6, according to cwndnewSend data, cwnd is set subsequentlyold=cwndnew。
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| CN112532535A (en) * | 2019-09-17 | 2021-03-19 | 华为技术有限公司 | Method and device for optimizing network congestion |
| CN111464452B (en) * | 2020-03-30 | 2022-10-14 | 南京理工大学 | Fast congestion feedback method based on DCTCP |
| CN111464452A (en) * | 2020-03-30 | 2020-07-28 | 南京理工大学 | Fast congestion feedback method based on DCTCP |
| CN113630337A (en) * | 2020-05-06 | 2021-11-09 | 华为技术有限公司 | Data stream receiving method, device and system and computer readable storage medium |
| CN113726671A (en) * | 2020-05-26 | 2021-11-30 | 华为技术有限公司 | Network congestion control method and related product |
| CN113746743A (en) * | 2020-05-29 | 2021-12-03 | 华为技术有限公司 | Data message transmission method and device |
| CN113746743B (en) * | 2020-05-29 | 2023-08-08 | 华为技术有限公司 | Data message transmission method and device |
| CN112383450A (en) * | 2020-11-30 | 2021-02-19 | 盛科网络（苏州）有限公司 | Network congestion detection method and device |
| CN115484210A (en) * | 2022-08-16 | 2022-12-16 | 北京百度网讯科技有限公司 | Method, device and system for determining congestion window |
| CN115484210B (en) * | 2022-08-16 | 2023-07-25 | 北京百度网讯科技有限公司 | Congestion window determining method, device and system |
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