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Data packet retransmission method and node in quick path interconnect system

A data packet and retransmission technology, applied in the computer field, can solve the problem of waste of system bandwidth resources, and achieve the effect of improving utilization rate, ensuring reliability and saving system resources.

Active Publication Date: 2014-11-05
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When the existing QPI system transmits an error in the data packet, the remote link layer retransmits all data packets sent after the error data packet, including the data packets that the remote link layer has sent to the local, thus Causes waste of system bandwidth resources

Method used

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  • Data packet retransmission method and node in quick path interconnect system
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  • Data packet retransmission method and node in quick path interconnect system

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Embodiment Construction

[0028] In the embodiment of the present invention, the first node and the second node communicate based on the QPI bus, and the interface protocol layers between each end and the QPI bus include: a physical layer, a link layer and a protocol layer. For ease of description, in the embodiment of the present invention, the protocol layers included in the first node are referred to as: the first physical layer, the first link layer, and the first protocol layer; the protocol layers included in the second node are referred to as: the second The physical layer, the second link layer, and the second protocol layer; the data packet, retransmission request, retransmission response, and reception confirmation information sent by the first node to the second node are respectively referred to as: the first data packet, the second A retransmission request, a second retransmission response, and second reception confirmation information; the data packet, retransmission request, retransmission...

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Abstract

Disclosed are a data packet retransmission method and node in a quick path interconnect system. When a first node acts as a sender, only a first data packet detected to be faulty is retransmitted to a second node, so as avoid repeatedly sending to the second node the first data packet already correctly received by the second node, thereby saving system resources occupied by data packet retransmission, and therefore increasing the utilization of the system resources. When the first node acts as a receiver, a first link layer of the first node buffers a second data packet correctly received within the period from sending of a first retransmission request to receiving of a first retransmission response, and upon correctly receiving a second data packet retransmitted by a second node, sends to a first protocol layer the second data packet buffered during said period, so that when the second node only retransmits the second data packet detected to be faulty, the first node does not lose any packet, thereby ensuring the reliability of QPI-bus-based data packet transmission.

Description

technical field [0001] The invention relates to computer technology, in particular to a data packet retransmission method and node in a fast channel interconnection system. Background technique [0002] Quick Path Interconnect (Quick Path Interconnect, referred to as QPI) technology, widely used in data exchange between central processing units (Central Processing Unit, referred to as CPU) of multi-processor platforms, is a serial high-speed transfer based on data packets The point-to-point connection protocol uses differential signals and special clocks for data transmission, which is used to realize direct interconnection between CPUs and provide high access bandwidth. The interface protocol based on the QPI bus includes: a physical layer (also called a lower layer, Lower Layer), a link layer (Link Layer) and a protocol layer (also called an upper layer, Upper Layer). The physical layer is responsible for receiving data packets sent by the external CPU and sending data pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/16H04L1/18H04L29/08H04L12/931
Inventor 刘建根刘钢蔡卫光
Owner HUAWEI TECH CO LTD
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