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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