Data stream long-tail optimization method for RC communication mode of RDMA network

A technology of communication mode and optimization method, which is applied in the direction of digital transmission system, using return channel for error prevention/detection, electrical components, etc. It can solve the problems that the requester cannot perceive loss, affect application performance, and data packet loss, etc., and achieve Reduce the probability of overtime retransmission, improve performance, and reduce latency

Active Publication Date: 2022-03-22
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the requester is unaware of the loss and continues transmitting until it times out
[0009] Second, the packet is lost twice
[0010] The timeout retransmission problem caused by the above two situations seriously affects the performance of the application and brings a very high long-tail delay

Method used

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  • Data stream long-tail optimization method for RC communication mode of RDMA network
  • Data stream long-tail optimization method for RC communication mode of RDMA network
  • Data stream long-tail optimization method for RC communication mode of RDMA network

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Embodiment Construction

[0040] The present invention is described in further detail now in conjunction with accompanying drawing.

[0041]It should be noted that terms such as "upper", "lower", "left", "right", "front", and "rear" quoted in the invention are only for clarity of description, not for Limiting the practicable scope of the present invention, and changes or adjustments in their relative relationships, without substantial changes in the technical content, shall also be regarded as the practicable scope of the present invention.

[0042] Figure 6 It is a flow chart of the long-tail optimization method of the data flow in the RC communication mode of the RDMA network according to the embodiment of the present invention, and 1 to 6 in the figure are the program numbers of the data interaction. see Figure 6 , the requester and the responder perform data interaction through the first ToR switch and the second ToR switch respectively; the optimization method includes the following steps:

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Abstract

The invention discloses a data stream long tail optimization method of an RDMA network RC communication mode, which comprises the following steps: a second ToR switch (a ToR switch close to a responder) receives a data packet sent by the responder and judges an operation code contained in the data packet, if the data packet contains an ACK extended transmission head, the second ToR switch analyzes the ACK extended transmission head, and if the ACK extended transmission head is not contained in the data packet, the second ToR switch sends the analyzed ACK extended transmission head to the RDMA network; if the analysis result is that the data packet represents the NAK packet with the disordered packet serial number, copying the NAK packet and sending the NAK packet to the requester; and the first ToR switch (the ToR switch close to the requester) receives the NAK packet, analyzes the NAK packet, records the serial number of the data packet carried in the NAK packet, copies one copy of the data packet when detecting that the requester sends the data packet with the same serial number, and then deletes the recorded serial number of the data packet. According to the method, the probability of timeout retransmission can be greatly reduced, the system performance is effectively improved, and the method has great practical application value.

Description

technical field [0001] The invention relates to the technical field of data center network communication, in particular to a long-tail optimization method of data flow in RDMA network RC communication mode. Background technique [0002] Remote Direct Memory Access (RDMA) has emerged as a state-of-the-art high-performance networking technology for data centers. It significantly reduces the latency of client-side and server-side data processing in network transmission. It transfers data directly from one computer's memory to another without the intervention of both operating systems, providing extremely low latency (about 3-5μs) and high throughput. [0003] The reliable connection transmission (Reliable Connection, RC) in the RDMA transmission mode is designed based on a lossless network (no packet loss caused by buffer overflow), and has low tolerance to packet loss. It adopts the Go-back-to-N retransmission mechanism, and the sender needs to retransmit all unconfirmed dat...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H04L49/20H04L1/16
CPCH04L49/208H04L1/1607
Inventor田臣龚媛媛高翼枭陈贵海
OwnerNANJING UNIV