基于Openflow解决TCP incast问题的流控机制研究.doc

文档介绍：
基于 Openflow 解决 TCP incast 问题的流控
机制研究
徐建华,张东旭,郭宏翔**
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(北京邮电大学信息光子学与光通信国家重点实验室,北京市 100876)
摘要:TCP incast,是在多对一的通信模型中,特定的应用场景下,因链路丢包带来的网络
性能急剧下降的问题,主要表现为吞吐率远低于链路带宽,导致链路利用率不足。这种应用
场景多出现在数据中心中,如分布式存储,MapReduce,和 web-search。本课题研究了基于
OpenFlow 解决 TCP incast 问题的集中控制机制,并设计出针对流控机制的 OpenFlow 协议
扩展。在 SDN 网络中,通过集中控制解决 TCP incast 是一种灵活有效的方案。
关键词:通信网络技术;OpenFlow;流控机制;TCP incast
中图分类号:
Research to Flow Control Mechanism for TCP incast based
on OpenFlow
Xu Jianhua, Zhang Dongxu, Guo Hongxiang
(State Key Laboratory of Information Photonics and munications, Beijing University
of Posts and munications, Beijing 100876)
Abstract: TCP incast, occurred in many to munication model,leads to work
performance suffer sharp collapse due to the link packet loss. After incast happens, the throughput
of the shared link is far below the link bandwidth. TCP incast appears in some specific application
scenarios in data center, such as distributed storage,MapReduce and web-search. Our research
studied centralized control mechanism for TCP incast based on OpenFlow protocol, and designed
the implementation of OpenFlow. We found that the mechanism is a flexible and effective
solution to incast in work.
Key words: work technology;OpenFlow;Flow control;TCP incast
0 引言
数据中心中的 TCP incast 问题带来的影响逐渐增大,吸引了越来越多业界人士的关注。
在多对一的通信模型中,TCP incast 带来的问题是链路利用率远低于链路带宽。到目前为