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首页> 外文会议>ACM SIGCOMM Internet Measurement Conference(IMC 2003); 20031027-20031029; Miami Beach,FL; US >Is the Round-trip Time Correlated with the Number of Packets in Flight ?
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Is the Round-trip Time Correlated with the Number of Packets in Flight ?

机译：往返时间是否与飞行中的数据包数量相关？

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摘要

TCP uses packet loss as a feedback from the network to adapt its sending rate. TCP keeps increasing its sending rate as long as no packet loss occurs (unless constrained by buffer size). Alternative congestion avoidance techniques (CATs) have been proposed to avoid such "aggressive" behavior. These CATs use simple statistics on observed round-trip times and/or throughput of a TCP connection in response to variations in congestion window size. These CATs have a supposed ability to detect queue build-up. The objective of this paper is to question the ability of these CATs to reliably detect queue build-up under real network conditions. For this purpose, the sample coefficient of correlation between round-trip time and the number of packets in flight is analyzed for 14,218 connections over 737 Internet paths. These coefficients of correlation were extracted from a set of tcpdump traces collected by Vern Paxson. The coefficients of correlation measured confirm that the correlation between RTT and window size is often weak.
机译：TCP使用数据包丢失作为网络的反馈来调整其发送速率。只要不发生数据包丢失（除非受到缓冲区大小的限制），TCP就会不断提高其发送速率。已经提出了替代的拥塞避免技术（CAT）来避免这种“攻击性”行为。这些CAT使用简单的统计信息，以响应于拥塞窗口大小的变化而观察到的往返时间和/或TCP连接的吞吐量。这些CAT具有检测队列建立的假定功能。本文的目的是质疑这些CAT在真实网络条件下可靠地检测队列建立的能力。为此，针对737个Internet路径上的14,218个连接，分析了往返时间和飞行中的数据包数量之间的样本相关系数。这些相关系数是从Vern Paxson收集的一组tcpdump跟踪中提取的。测得的相关系数证实RTT和窗口大小之间的相关性通常很弱。

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