JP7417773B1 - Network interface card and transmission performance monitoring method - Google Patents

Abstract

A technique is provided that allows monitoring the performance of data transmission in a NIC with respect to the stability of an optical output signal. [Solution] A network interface card is connected to a controller that controls the transmission and reception of data between the server and an external server via a bus interface inside the server, and is connected to the controller, and converts data input from the controller into electrical signals and optical signals. A communication optical module that converts the data into a signal and outputs the converted data to an optical branch circuit connected to the network, and a monitoring optical module that converts the returned data branched by the optical branch circuit from an optical signal to an electrical signal. and a monitoring unit that monitors data transmission performance based on the normality of return data input from the monitoring optical module. Notify a system or application. [Selection diagram] Figure 1

Description

The present disclosure relates to a network interface card and a transmission performance monitoring method.

Servers may be required to be used without any problems. However, the network interface card (hereinafter referred to as NIC) provided in the server may continue to be used with performance degradation occurring, resulting in a serious problem.

Patent Document 1 describes a method of detecting abnormality in transmission using a packet for confirming the communication path by using a loop-back dedicated circuit provided inside an interface connected to a LAN.

Japanese Patent Application Publication No. 2021-034907

However, although the method described in Patent Document 1 can detect an abnormality that occurs inside the NIC, it cannot detect the presence or absence of an abnormality in which the optical output signal is unstable in the optical module actually used for communication with the outside of the server.

One example objective of the present disclosure is to provide a technique that allows monitoring the performance of data transmission in a NIC with respect to the stability of the optical output signal.

A network interface card in one aspect of the present disclosure is connected to a controller that controls transmission and reception of data between the server and an external server via a bus interface inside the server, and is connected to the controller to transmit data input from the controller into electrical signals. A communication optical module that converts the data into an optical signal and outputs the converted data to an optical branch circuit connected to the network, and a monitoring module that converts the return data branched by the optical branch circuit from an optical signal to an electrical signal. an optical module; and a monitoring unit that monitors data transmission performance by monitoring the normality of return data input from the monitoring optical module, and the monitoring unit is configured to: Notify the operating system or application inside the server.

In a transmission performance monitoring method according to an aspect of the present disclosure, in a network interface card that is included in a server and that transmits and receives data between the server and a network, a computer outputs an output from a controller included in the network interface card, and a communication The data transmission performance is monitored by monitoring the normality of input return data that is converted into an optical signal by the monitoring optical module and then converted into an electrical signal by the monitoring optical module. If transmission performance deteriorates, a notification is sent to the server's internal operating system or application.

One example of the benefits of the present disclosure is that the performance of data transmission at the NIC can be monitored with respect to the stability of the optical output signal.

FIG. 2 is a block diagram showing an example of the configuration of a network interface unit including a NIC and an optical branch circuit. FIG. 1 is a block diagram illustrating an example of a communication system including a server including a NIC and a connected device. FIG. 3 is a sequence diagram showing the operation of each component related to monitoring transmission performance. 3 is a flowchart showing the operation of the monitoring section. FIG. 2 is a block diagram showing an example of the configuration of a NIC. FIG. 2 is a block diagram showing an example of the configuration of a network interface unit including a NIC and an optical branch circuit.

Embodiments of the present disclosure will be described in detail with reference to the drawings.

[Embodiment]
FIG. 1 is a block diagram illustrating an example of the configuration of a network interface section including an NIC 100 and an optical branch circuit 200 in the embodiment. Referring to FIG. 1, the NIC 100 includes a controller 101, a communication optical module 102, a monitoring optical module 103, and a monitoring unit 104. Further, the communication optical module 102 and the monitoring optical module 103 of the NIC 100 are communicably connected to the optical branch circuit 200. Further, the optical branch circuit 200 is communicably connected to the network 300.

The NIC 100 is a device for realizing communication between network-related devices and a network. In the present disclosure, the NIC 100 is provided in a server that is a network-related device.

FIG. 2 is a block diagram illustrating an example of a communication system including the server 10 including the NIC 100 and connected devices in the embodiment. Referring to FIG. 2, the server 10 includes a memory 11, a memory controller 12, a processor 13, an input/output controller 14, an input/output card slot 15, a system bus 18, and a bus interface 19. Further, an active NIC 16 and a standby NIC 17 are inserted into the input/output card slot 15 . Further, the server 10 is communicably connected to a network switch 30. Here, the active NIC 16 of the server 10 is connected to the network switch 30 via the optical branch circuit 200. Further, the standby NIC of the server 10 is connected to the network switch 30. Furthermore, the network switch 30 is communicably connected to other servers 40. The network switch 30 connects devices such as a plurality of servers. In the network 300, a network switch 30, a server 10 connected to the network switch 30, and a plurality of other servers 40 are connected, and mutually transmit data.

In FIG. 2, the active NIC 16 is the NIC 100 in FIG. Further, the standby NIC 17 may be the NIC 100 or a well-known NIC. Further, the backup NIC 17 may be connected to the network switch 30 via the optical branch circuit 200, similarly to the active NIC 16.

Another configuration of the server 10 in FIG. 2 will be described. In server 10, memory 11 stores data. The memory 11 may be a RAM (Random Access Memory) or a ROM (Read Only Memory). The memory control unit 12 manages the memory 11. The memory control unit 12 allocates a part of the memory 11 or releases the allocated part of the memory 11, for example, in response to a request from the processor 13. The processor 13 performs information processing described in a program. The program is, for example, an operating system (hereinafter also referred to as OS), an application, or the like. When receiving an input/output command from the processor, the input/output control unit 14 inputs/outputs data to/from an input/output device that inputs/outputs data to/from the server. The input/output card slot 15 includes an expansion device insertion port for connecting to various input/output devices. As described above, the active NIC 16 and the backup NIC 17 are inserted into the input/output card slot 15 in the server 10 . System bus 18 is a data transmission path that connects processor 13 and other components. The bus interface 19 is a data transmission path that connects the input/output control unit 14 to the active NIC 16 and the backup NIC 17, respectively.

In FIG. 2, the server 10 includes an active NIC 16 and a standby NIC 17 as NICs. A configuration in which a plurality of devices are prepared in this way is called a redundant configuration. The server 10 according to the present disclosure has a redundant NIC configuration, so that even if one NIC fails, the other NIC can be used to continue operating the server 10 while repairing or replacing the failed NIC. It is possible to do so. Such a configuration is used in a mission-critical server, that is, a server that must not stop or malfunction.

Up to this point, the server 10 in FIG. 2 has been described, but the configuration of the server provided with the NIC 100 is not limited to this.

The general functions of the NIC 100 will be described with reference to FIGS. 1 and 2. In FIGS. 1 and 2, the NIC 100 transmits data input from the server 10 via the bus interface 19 to the network 300. For example, the NIC 100 transmits data input from the server 10 via the bus interface 19 to another server 40 via the optical branch circuit 200 and the network switch 30. Further, the NIC 100 receives data from the network 300. For example, the NIC 100 receives data transmitted by another server 40 via the network switch 30 and the optical branch circuit 200, and inputs the data to the server 10.

Next, each configuration of the NIC 100 of this embodiment will be described in detail.

The controller 101 controls the transmission and reception of data between the server 10 and the external server 40 via the bus interface 19 inside the server 10 . When the NIC 100 is a LAN interface card, the controller 101 is also called a LAN controller.

In FIG. 1, a communication optical module 102 is a device that converts data from an electrical signal to an optical signal and from an optical signal to an electrical signal. The communication optical module 102 is connected to the controller 101 and converts data input from the controller 101 from electrical signals to optical signals. The communication optical module 102 then outputs the converted data to the optical branch circuit 200 connected to the network. The optical branch circuit 200 will be described later.

The communication optical module 102 is, for example, an SFP (Small Form-Factor Pluggable) module, an SFP+ module, etc., but is not limited to these examples. When converting data from an electrical signal to an optical signal, the communication optical module 102 may experience a unique failure in which the optical output signal is unstable. The fact that an optical signal is not stable is visualized when an eye pattern, which is displayed by superimposing a large number of signal waveform transitions, is disrupted during transmission, including optical communication.

Here, the optical branching circuit 200 is a circuit that physically branches an input optical signal and outputs each branched optical signal. The optical branch circuit 200 is connected to the NIC 100 of the server 10 and the network 300. More specifically, the optical branch circuit 200 is connected to the communication optical module 102 and the monitoring optical module 103 of the NIC 100 through the optical interface 20, respectively. Further, the optical branch circuit 200 is connected to a network switch 30 that is connected to other servers 40.

The optical branching circuit 200 branches the optical signal input from the communication optical module 102. The optical branch circuit 200 outputs one of the branched optical signals to a connection destination included in the network 300, for example, the network switch 30. The optical branch circuit 200 then outputs the other of the branched optical signals to the monitoring optical module 103. In the following description, data transmitted from the server 10 to the network 300 or other servers 40 will be referred to as transmission data, and data branched by the optical branching circuit 200 and output to the monitoring optical module 103 will be referred to as return data.

The monitoring optical module 103 is a device that converts data from optical signals to electrical signals. The monitoring optical module 103 is connected to the optical branching circuit 200 and converts the return data branched by the optical branching circuit 200 from an optical signal to an electrical signal. The monitoring optical module 103 outputs the return data converted into an electrical signal to the monitoring unit 104.

Note that in the present disclosure, Rx and Tx included in a communication optical module, an optical branch circuit, a monitoring optical module, etc. are a reception connector and a transmission connector, respectively.

The monitoring unit 104 monitors data transmission performance. For example, the monitoring unit 104 determines that data transmission performance has deteriorated. More specifically, the monitoring unit 104 monitors the data transmission performance of the NIC 100. The monitoring unit 104 monitors data transmission performance based on the normality of return data input from the monitoring optical module 103. Monitoring of the normality of return data and monitoring of data transmission performance by the monitoring unit 104 will be described later. Further, when the data transmission performance has deteriorated, the monitoring unit 104 notifies the operating system or application inside the server 10 via the controller 101 that the data transmission performance has deteriorated. This notification will be described later.

First, monitoring of data transmission performance by the monitoring unit 104 will be described. The monitoring unit 104 monitors the data transmission performance based on a value related to abnormality detection calculated by a predetermined method from the error detection code of the return data. An error detection code is a code configured to be able to detect errors in data during data communication. For example, when transmitting data, the data transmitting side adds data calculated from the data to be transmitted using a certain procedure as an error detection code to the data to be transmitted. The data receiving side then detects errors using the error detection code added to the received data. For example, the monitoring unit 104 compares the error detection code added to the frame of return data with a value calculated from the frame data of return data using the same method as the error detection calculation used during data transmission. Errors in returned data may also be detected. The error detection code is, for example, FCS (Frame Check Sequence) or CRC (Cyclic Redundancy Code), but is not limited to these examples.

When the monitoring unit 104 detects that there is an abnormality in the return data using the error detection code, the monitoring unit 104 counts the number of times the abnormality is detected as the first error number. The monitoring unit 104 may determine that the performance of data transmission has deteriorated when the first number of errors relative to the number of transmitted data is equal to or greater than a threshold value.

Furthermore, the monitoring unit 104 may monitor the performance of data transmission by taking into account abnormalities in the transmission data input to the controller 101 in addition to abnormalities in the return data. Here, it is assumed that an abnormality in the transmission data input to the controller 101 is counted as the second error number. The second error count may be monitored by the controller 101 or may be monitored by another additional configuration. In this case, the monitoring unit 104 calculates the total number of errors including the first number of errors and the second number of errors, and if the total number of errors with respect to the number of transmitted data is equal to or greater than a threshold value, the performance of data transmission has deteriorated. It can be determined that

Note that the threshold value for determining that data transmission performance has deteriorated may be set in advance. The threshold value is, for example, 0.025%. The threshold value is not limited to this example, and may be determined as appropriate.

Next, a notification regarding a decrease in data transmission performance by the monitoring unit 104 when the data transmission performance has decreased will be described. As described above, when the data transmission performance deteriorates, the monitoring unit 104 notifies the operating system or application inside the server 10 via the controller 101 that the data transmission performance has deteriorated. This allows the server 10 to detect a decline in the data transmission performance of the NIC 100 and take necessary measures accordingly. Here, the necessary response includes switching NICs in a redundant configuration, or notifying an administrator or the like that repair or replacement is necessary. Further, for example, when the data transmission performance deteriorates, the monitoring unit 104 notifies the operating system or application inside the server 10 via the controller 101 that the NIC needs to be switched. Good too. Switching the NIC means switching the currently used NIC (for example, the active NIC 16) to the standby NIC (for example, the standby NIC 17).

Further, the monitoring unit 104 may stop the data transmission and reception by the NIC 100 when the data transmission performance deteriorates. For example, the monitoring unit 104 stops data transmission by the network interface card by stopping data transmission by the controller 101 and returning an error return in response to a transmission request from a network adapter driver provided inside the server 10. .

The operation of data transmission performance monitoring by the NIC 100 and peripheral devices configured as described above will be described with reference to the sequence diagram of FIG. 3.

As shown in FIG. 3, first, the communication optical module 102 converts transmission data (electrical signal) input from the controller 101 from an electrical signal to an optical signal (step S101). The communication optical module 102 then outputs the converted transmission data (optical signal) to the optical branching circuit 200 (step S102).

Next, the optical branch circuit 200 branches the transmission data (optical signal) input from the communication optical module 102 (step S103). The optical branching circuit 200 outputs one of the branched optical signals to the network 300 as transmission data (optical signal) (step S104). Then, the optical branching circuit 200 outputs the other of the branched optical signals to the monitoring optical module 103 as return data (optical signal) (step S105).

Next, the monitoring optical module 103 converts the input return data (optical signal) from an optical signal to an electrical signal (step S106). Then, the monitoring optical module 103 outputs the converted return data (electrical signal) to the monitoring unit 104 (step S107).

Then, the monitoring unit 104 monitors the normality of the return data (electrical signal) input from the monitoring optical module 103 (step S108). The operation of the monitoring unit 104 after step S108 will be described later with reference to the flowchart in FIG.

With this, the NIC 100 and the peripheral device complete a series of operations. These series of operations may be performed sequentially with respect to data transmission by the server 10.

Next, the operation of the monitoring unit 104 will be explained with reference to the flowchart in FIG.

The monitoring unit 104 first receives return data (electrical signal) from the monitoring optical module 103 (step S201).

The monitoring unit 104 determines whether there is an abnormality in the return data (electrical signal) (step S202). The monitoring unit 104 determines whether there is an abnormality using, for example, FCS or CRC, which are error detection codes.

If there is an abnormality in the return data (electrical signal) (step S202: Yes), the monitoring unit 104 counts the first error number by registering an error counter (step S203). If there is no abnormality in the return data (electrical signal) (step S202: No), the monitoring unit 104 returns to the operation of step S201.

Then, the monitoring unit 104 determines whether the rate of data abnormality occurrence exceeds a threshold (step S204). As described above, the rate of data abnormality occurrence may be the number of first errors relative to the number of transmitted data, or the total number of errors of the first error number and second error number relative to the number of transmitted data.

If the monitoring unit 104 determines that the data abnormality occurrence rate exceeds the threshold (step S204: Yes), the monitoring unit 104 determines that the data transmission performance of the NIC 100 has deteriorated, and notifies the operating system and applications of the server 10. (Step S205). Further, if it is determined that the rate of data abnormality occurrence exceeds the threshold value, the monitoring unit 104 may stop the transmission and reception of data by the NIC 100, as described above. Furthermore, if it is determined that the data abnormality occurrence rate exceeds the threshold (step S204: No), the monitoring unit 104 returns to the operation of step S201.

With this, the monitoring unit 104 ends the series of operations.

The NIC in this embodiment described above includes a controller, a communication optical module, a monitoring optical module, and a monitoring section. The communication optical module and the monitoring optical module are each connected to an optical branch circuit. The communication optical module converts the server's transmission data from an electrical signal to an optical signal, and inputs the converted optical signal to the optical branch circuit. The optical signal, which is the return data branched by the optical branch circuit, is input to the monitoring optical module. The monitoring optical module converts the return data from an optical signal to an electrical signal and inputs it to the monitoring section. The monitoring unit then monitors the data transmission performance by monitoring the normality of the return data.

As a result, the NIC in this embodiment can monitor data transmission performance in the NIC.

In a NIC that includes an optical module that converts an electrical signal into an optical signal, a failure peculiar to the optical module may occur in which the optical output signal is unstable.

If the optical output signal is unstable, the connection destination, such as a LAN (Local Area Network) switch that receives data transmitted from the NIC provided in the server, may go down due to a decrease in the optical reception strength. Not detected. At a connection destination that receives data transmitted from a NIC provided in a server, an abnormality in the received data is detected and the received data is discarded. An abnormality in the data received at the connection destination is, for example, a bit garbled such as an FCS (Frame Check Sequence) error. Then, the error count of the MIB (Management Information Base) of the corresponding reception port of the network switch is incremented, thereby leaving a history of abnormalities in the received frame. Further, in the upper TCP (Transmission Control Protocol) layer between servers, if there is no reception response from the other party, recovery is performed by retransmitting the frame according to the specifications of the TCP/IP (Internet Protocol) network.

However, in this case, the NIC provided in the server does not have a means to recognize that the transmitted data has been detected as abnormal and discarded at the connection destination. For this reason, the upper level application software of the server cannot recognize that communication performance has deteriorated.

On the other hand, the monitoring unit monitors the normality of return data that is converted from an electrical signal to an optical signal by the communication optical module and branched by the optical branch circuit. This makes it possible to detect errors that occur in the communication optical module, which could not be detected by the server that is the data transmission source. Thereby, a server equipped with a NIC can take measures against performance degradation of the NIC including errors occurring in the communication optical module.

[Modified example]
Next, a modification of the embodiment will be described with reference to the drawings.

FIG. 5 is a diagram showing the functional configuration of the NIC 100A including the optical branching circuit 200. As shown in FIG. 5, the NIC may be configured to include an optical branch circuit within the NIC.

Further, FIG. 6 is a block diagram showing the functional configuration of the NIC 100 and the optical branch circuit 200A. As shown in FIG. 6, the optical branching circuit 200A may be configured to branch an input optical signal and output the branched optical signal. That is, compared to the optical branch circuit 200 in the embodiment, the optical branch circuit 200A does not include a reception connector that receives data from the network 300 and a transmission connector that outputs the input data. In this case, the communication optical module 102 of the NIC 100 may receive data directly from the network 300.

Note that the optical branch circuit 200A may also be provided within the NIC, similarly to the optical branch circuit 200.

Although the present invention has been described above with reference to each embodiment, the present invention is not limited to the above embodiments. Various changes can be made to the configuration and details of the present invention that can be understood by those skilled in the art within the scope of the present invention.

Furthermore, although the plurality of operations are described in order in the form of a flowchart, the order in which they are described does not limit the order in which the plurality of operations are executed. Therefore, when implementing each embodiment, the order of the plurality of operations may be changed within a range that does not interfere with the content.

Part or all of the above embodiments may be described as in the following additional notes, but are not limited to the following.

(Additional note 1)
A controller that controls data transmission and reception between the server and an external server via a bus interface inside the server;
a communication optical module connected to the controller, converting data input from the controller from an electrical signal to an optical signal, and outputting the converted data to an optical branch circuit connected to a network;
a monitoring optical module that converts the return data branched by the optical branch circuit from an optical signal to an electrical signal;
a monitoring unit that monitors data transmission performance based on the normality of the return data input from the monitoring optical module;
The monitoring unit notifies an operating system or an application inside the server when data transmission performance deteriorates.
network interface card.

(Additional note 2)
The network interface card according to supplementary note 1, wherein the monitoring unit monitors data transmission performance based on a value related to abnormality detection calculated by a predetermined method from an error detection code of the return data.

(Additional note 3)
If there is an abnormality in the return data, the monitoring unit counts it as a first error number, and if the first error number with respect to the number of transmitted data is equal to or more than a threshold value, it is determined that the performance of data transmission has deteriorated. Supplementary Note 1 or 2 Network interface cards listed in .

(Additional note 4)
The monitoring unit calculates the total number of errors of the second number of errors, which is the number of abnormalities in the transmission data input to the controller, and the first number of errors, and calculates the total number of errors with respect to the number of transmission data. If the number is equal to or greater than the threshold, it is determined that the data transmission performance has deteriorated. The network interface card according to appendix 3.

(Appendix 5)
The network interface card according to any one of appendices 1 to 4, wherein the monitoring unit stops data transmission and reception by the network interface card when data transmission and reception performance deteriorates.

(Appendix 6)
When the data transmission performance deteriorates, the monitoring unit stops data transmission of the controller and returns an error return in response to a transmission request from a network adapter driver provided inside the server, thereby controlling the network interface card. Stop sending and receiving data by the network interface card described in Appendix 5.

(Appendix 7)
When the data transmission performance deteriorates, the monitoring unit notifies an operating system or an application inside the server that the data transmission performance has deteriorated.
The network interface card according to any one of Supplementary Notes 1 to 6.

(Appendix 8)
The monitoring unit notifies an operating system or an application inside the server that a network interface card needs to be switched when data transmission performance deteriorates;
The network interface card according to any one of Supplementary Notes 1 to 7.

(Appendix 9)
further comprising the optical branch circuit;
The network interface card according to any one of Supplementary Notes 1 to 8.

(Appendix 10)
A network interface card provided in a server and configured to transmit and receive data between the server and a network,
The computer is
The controller provided in the network interface card outputs the data, which is converted into an optical signal by the communication optical module, and further converted into an electrical signal by the monitoring optical module.Based on the normality of input return data, the data is Monitor transmit and receive performance,
As a result of monitoring, if the performance of data transmission and reception deteriorates, notifying the operating system or application inside the server;
Monitoring method.

10 Server 11 Memory 12 Memory Control Unit 13 Processor 14 Input/Output Control Unit 15 Input/Output Card Slot 16 Active Network Interface Card 17 Standby Network Interface Card 18 System Bus 19 Bus Interface 20 Optical Interface 30 Network Switch 40 Server 100 Network Interface Card 100A Network interface card 101 Controller 102 Communication optical module 103 Monitoring optical module 104 Monitoring section 200 Optical branch circuit 200A Optical branch circuit 300 Network

Claims (10)

A controller that controls data transmission and reception between the server and an external server via a bus interface inside the server;
A first transmission connector connected to the controller, converts data input from the controller from an electrical signal to an optical signal, and outputs the converted data to the external server via an optical branch circuit connected to a network. a communication optical module that converts data input from the external server to the first receiving connector from an optical signal to an electrical signal ;
a monitoring optical module that converts return data that is branched from the optical signal output to the external server by the optical branch circuit and input to the second reception connector from an optical signal to an electrical signal;
a monitoring unit that monitors data transmission performance based on the normality of the return data input from the monitoring optical module;
The monitoring unit notifies an operating system or an application inside the server when data transmission performance deteriorates.
network interface card. The network interface card according to claim 1, wherein the monitoring unit monitors data transmission performance based on a value related to abnormality detection calculated by a predetermined method from an error detection code of the return data. The monitoring unit counts as a first error number when there is an abnormality in the return data, and determines that data transmission performance has deteriorated when the first error number with respect to the number of transmitted data is equal to or more than a threshold value. Network interface card listed. The monitoring unit calculates the total number of errors of the second number of errors, which is the number of abnormalities in the transmission data input to the controller, and the first number of errors, and calculates the total number of errors with respect to the number of transmission data. The network interface card according to claim 3, wherein when the number is equal to or greater than a threshold value, data transmission performance is determined to have deteriorated. The network interface card according to claim 1, wherein the monitoring unit stops data transmission and reception by the network interface card when data transmission and reception performance deteriorates. When the data transmission performance deteriorates, the monitoring unit stops data transmission of the controller and returns an error return in response to a transmission request from a network adapter driver provided inside the server, thereby controlling the network interface card. The network interface card according to claim 5, wherein data transmission and reception by the network interface card is stopped. When the data transmission performance deteriorates, the monitoring unit notifies an operating system or an application inside the server that the data transmission performance has deteriorated.
The network interface card according to claim 1. The monitoring unit notifies an operating system or an application inside the server that a network interface card needs to be switched when data transmission performance deteriorates;
The network interface card according to claim 1. further comprising the optical branch circuit;
A network interface card according to any one of claims 1 to 8. A network interface card provided in a server and configured to transmit and receive data between the server and an external server ,
A communication optical module included in the network interface card,
Data input from the controller is converted from an electrical signal to an optical signal, the converted data is output from the first transmission connector to the external server via an optical branch circuit connected to a network, and the data is transmitted from the external server to the first transmission connector. Converts the data input to the receiving connector of 1 from an optical signal to an electrical signal,
A monitoring optical module included in the network interface card,
Converting return data that is branched from the optical signal output to the external server by the optical branch circuit and input to the second reception connector from an optical signal to an electrical signal;
The computer is
Monitoring data transmission performance based on the normality of the return data input from the monitoring optical module;
If the data transmission performance deteriorates as a result of monitoring, notifying the operating system or application inside the server;
Transmission performance monitoring method.

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