On Wednesday 02 Mar 2011 20:48:42 artur wrote: > Hi, > > I recently found this article from google research. > It is related to your question. > > An Argument for Increasing TCP's Initial Congestion Window > Abstract (http://research.google.com/pubs/pub36640.html) > > TCP flows start with an initial congestion window of at most four > segments or approximately 4KB of data. Because most Web transactions are > short-lived, the initial congestion window is a critical TCP parameter > in determining how quickly flows can finish. While the global network > access speeds increased dramatically on average in the past decade, the > standard value of TCP?s initial congestion window has remained > unchanged. In this paper, we propose to increase TCP?s initial > congestion window to at least ten segments (about 15KB). Through > large-scale Internet experiments, we quantify the latency benefits and > costs of using a larger window, as functions of network bandwidth, > round-trip time (RTT), bandwidthdelay product (BDP), and nature of > applications. We show that the average latency of HTTP responses > improved by approximately 10% with the largest benefits being > demonstrated in high RTT and BDP networks. The latency of low bandwidth > networks also improved by a significant amount in our experiments. The > average retransmission rate increased by a modest 0.5%, with most of the > increase coming from applications that effectively circumvent TCP?s slow > start algorithm by using multiple concurrent connections. Based on the > results from our experiments, we believe the initial congestion window > should be at least ten segments and the same be investigated for > standardization by the IETF. > > The article: > http://research.google.com/pubs/archive/36640.pdf > Not really relevant, we have long lived connections.
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