TCP congestion control method for centralized end network coordination in data center network

Abstract

The invention discloses a TCP congestion control method for centralized end network coordination in a data center network. The method comprises the steps that a queue length of each port is obtained,and when the ports are in a congested state, according to queue length thresholds of different congestion levels, the congestion levels of the ports are marked; a source IP, source TCP port, and Packet byte size of each data packet newly queued in the ports in the congested state are extracted, the extracted information and the congestion levels of the ports are adopted to generate congestion messages; a controller receives the congestion messages uploaded by an exchanger, scheduling flows and deceleration factors of the ports which need to be decelerated are selected according to the congestion levels of the ports corresponding to the congestion messages; the scheduling flow and deceleration factor of each congested port is adopted to generate an adjustment message, and the adjustment messages are sent to a host side corresponding to the scheduling flows by means of TCP Socket communication; and the host side adjusts the transmission rates of the scheduling flows according to the scheduling flows and deceleration factors in the adjustment messages.

Description

technical field [0001] The invention relates to an adjustment method when the network is congested, in particular to a TCP congestion control method coordinated by a centralized end network in a data center network. Background technique [0002] With the rapid development of cloud computing and the substantial increase of Internet application services, the traffic in the data center network has increased sharply, and the traffic growth has led to the tension of network bandwidth resources. Congestion occurs, queue accumulation, packet loss, and delay increase occur, seriously affecting network performance and user experience. In order to alleviate the congestion problem in the data center and make the network meet the requirements of traffic with different characteristics as much as possible, the congestion control mechanism in the data center network has become a research hotspot. [0003] Aiming at the congestion control mechanism under the data center network, the distri...

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Problems solved by technology

[0003] Aiming at the congestion control mechanism under the data center network, the distributed congestion control mechanism specially designed for the data center network is commonly used at present. The congestion control algorithm of TCP is improved through active queue management and the advantages of centralized control of SDN technology are utilized. The controller centrally makes decisions on congestion according to the reported network status information and adjusts the congestion under the network. Although these two methods can reduce the congestion level of the data center network to a certain extent, the first mechanism is easy to cause concurrency and bursts. Synchronization of conflicts and frequent changes of routes, while the second type needs to maintain and detect information such as the real-time survival time and flow size of all flows. On the switch side, it is also necessary to update the TCP notification window value, which makes the overhead of switch parsing and caching bigger

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