TCP连接传输速率限制因素的测量和诊断

TCP连接的传输速率是很重要的一个网络性能指标.由于很多应用的性能都取决于它,我们往往需要找出TCP连接传输速率的瓶颈并进而提高.然而,TCP连接传输速率受到多种因素如丢包、瓶颈带宽以及发送接收端缓存的限制,分析起来比较复杂.本文描述了我们设计的一个工具,它通过分析TCP数据trace文件来确定连接发送窗口的受限因素并测量连接的RTT,使我们很容易确定连接传输速率的受限因素.实际网络测量表明该工具能够分辨多种传输速率限制因素.

The Measurement and Diagnosis of TCP Throughput Limiting Factors

TCP throughput is one of important network performance metrics. As the performance of many applications depends on it, we usually need to identify its limiting factors in order to increase it. However, TCP throughput is affected by many factors such as loss, bottleneck bandwidth, and sender/receiver buffer. In this paper, we describe our tool which identifies the limiting factor of sender window size, and measures the average RTT of the connection based on packet traces dumped at the TCP sender side. The output of the tool enable us to determine the limiting factors of TCP throughput. Testbed measurements validated our method.