数据中心网络中高并发TCP传输的随机退避方法  

Random Backoff Method for Highly Concurrent TCP Transmission in Data Center Network

作　　者：郭月月 黄家玮[1] 刘敬玲[1] 王建新 GUO Yueyue;HUANG Jiawei;LIU Jingling;WANG Jianxin(School of Information Science and Engineering,Central South University,Changsha 410083,China)

机构地区：[1]中南大学信息科学与工程学院,长沙410083

出　　处：《计算机工程》2018年第4期135-139,144,共6页Computer Engineering

基　　金：国家自然科学基金(61572530);赛尔网络下一代互联网技术创新项目(NGII20160113)

摘　　要：在现代数据中心网络中,分散聚合的传输模式容易导致瓶颈链路上的吞吐率崩塌,产生TCP Incast现象。为此,提出一种随机退避的方法,来降低TCP流突发传输的并发程度,通过计算最优的随机退避时间,控制瓶颈链路的瞬时拥塞程度,有效解决TCP Incast问题。从理论上建模分析随机退避时间区间内随机退避各TCP流时的超时概率和吞吐率。实验结果表明,该方法可以有效避免传输超时事件,将TCP流并发度和网络吞吐率分别提升2倍和80倍。In the modern data center network,the partition aggregation transmission pattern easily leads to the throughput collapse on the bottleneck link,resulting in TCP Incast phenomenon.This paper proposes a random backoff method to reduce the concurrency degree of TCP flow burst transmission.By calculating the optimal random backoff time,the instantaneous congestion degree of bottleneck link is controlled and the TCP Incast problem is solved effectively.And it models and analyzes in theory the time-out probability and throughput when all TCP flows retreat randomly in the random backoff time interval.Experimental results show that the method can effectively avoid the transmission timeout event.The TCP flow concurrency and network throughput are increased by 2 times and 80 times respectively.

关 键 词：数据中心网络 TCP Incast现象 分散聚合传输模式 随机退避 传输控制协议 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]