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Rapid and simple quantitative congestion notification method

A simple technology of congestion notification, applied in the direction of digital transmission system, electrical components, transmission system, etc., can solve the problem of long idle time of the link, and achieve the effect of avoiding the waste of bandwidth

Active Publication Date: 2016-08-31
CENT SOUTH UNIV
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AI Technical Summary

Problems solved by technology

If the current sending rate is small when the network environment changes, QCN may take a long time to detect the bandwidth, making the link idle for a long time

Method used

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  • Rapid and simple quantitative congestion notification method
  • Rapid and simple quantitative congestion notification method
  • Rapid and simple quantitative congestion notification method

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Embodiment Construction

[0042] In order to make the purpose, content and advantages of the present invention clearer, the implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0043] The fast and simple quantitative congestion notification method described in the present invention is an improvement for two shortcomings of QCN. First of all, QCN cannot find a suitable sending rate that just saturates the bottleneck bandwidth through the half-search algorithm. As a result, QCN adds an additional supplementary mechanism (active increase, super-active increase) to the half-search algorithm, which makes the design of QCN complicated.

[0044] In order to verify that QCN cannot find a suitable sending rate through the half-search algorithm, the supplementary mechanisms of QCN such as active increase and super active increase are removed in the simulation experiment. The simulation scenario adopts a many-to-one topology, with a tot...

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Abstract

The invention discloses a rapid and simple quantitative congestion notification method. The method is cooperatively completed by a congestion point and a response point; the response point (namely a source end) initializes the sending rate into the link rate, determines whether to decrease the speed and reset the sending rate according to the type of a feedback packet received by self, or adjusts the sending rate by adopting a binary searching algorithm while not receiving the feedback packet; and the congestion point (namely a switch) initializes a variable congested to identify whether the switch is congested, samples to generate the feedback packet according to the queue length and the variable quantity of the queue length in a sampling period, and sends the feedback packet to the response point. According to the rapid and simple quantitative congestion notification method disclosed by the invention, the quantitative congestion notification (QCN) of a link layer congestion control standard protocol established by an IEEE 802.1Qau working team is simplified and improved; the spare bandwidth can be rapidly obtained; and thus, the rapid and simple quantitative congestion notification method is particularly applied to a data centre network environment.

Description

technical field [0001] The invention relates to a link layer congestion control algorithm, in particular to a fast and simple quantitative congestion notification method. Background technique [0002] Many different online application services are deployed in the current data centers for users to use, such as search services, social network services, game services, file transfer and storage services, and so on. The traffic types generated by these different services are not the same, and these different traffics are carried and transmitted by different networks. For example, TCP / IP traffic runs on Ethernet, block storage network traffic runs on Fiber Channel, and high-performance computing traffic runs on Infiniband networks. These different networking technologies complicate the management of the data center and increase the operating cost of the data center. In order to deal with these problems, the IEEE 802.1 Data Center Bridging Working Group designed Data Center Ether...

Claims

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Application Information

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IPC IPC(8): H04L12/801H04L12/825
CPCH04L47/12H04L47/263
Inventor 蒋万春阮昌王建新
Owner CENT SOUTH UNIV
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