[Tmrg] Proposal to increase TCP initial CWND

fred at cisco.com (Fred Baker) Sun, 18 July 2010 06:53 UTC

From: fred at cisco.com (Fred Baker)
Date: Sat, 17 Jul 2010 23:53:33 -0700
Subject: [Tmrg] Proposal to increase TCP initial CWND
In-Reply-To: <AANLkTil937lyUzRvUtdqd2qdl9RN7AZ-Mo_cT-dtmqXz@mail.gmail.com>
References: <AANLkTil937lyUzRvUtdqd2qdl9RN7AZ-Mo_cT-dtmqXz@mail.gmail.com>
Message-ID: <923833DA-FC31-4D30-96A5-48D4D072DBD3@cisco.com>

This is essentially the point of concern I raised to them; I also raised the point that what works well in the broadband Internet is quite a bit different than Internet access in parts of the world that have slower typical access rates.

On Jul 17, 2010, at 11:27 PM, Lachlan Andrew wrote:

> - An increase in retransmissions from 3.94% to 5.79% seems very
> significant, if that rate reflects the loss rate.  Although described
> as a 1.85% increase, it seems likely to cause competing traffic to
> slow down by a factor of  sqrt(5.79/3.94).  Moreover, that is the
> increase in loss when (presumably) a *single* flow on that bottleneck
> increases its initial window.  How can we estimate the impact of *all*
> flows increasing their initial windows?

http://www.ipinc.net/IPv4.GIF