From: Stephen Hemminger <shemminger@linux-foundation.org>
Date: Thu, 29 Nov 2007 14:10:55 +0000 (+1100)
Subject: [TCP] illinois: Incorrect beta usage
X-Git-Tag: v2.6.24-rc4~8^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a357dde9df33f28611e6a3d4f88265e39bcc8880;p=pandora-kernel.git

[TCP] illinois: Incorrect beta usage

Lachlan Andrew observed that my TCP-Illinois implementation uses the
beta value incorrectly:
  The parameter  beta  in the paper specifies the amount to decrease
  *by*:  that is, on loss,
     W <-  W -  beta*W
  but in   tcp_illinois_ssthresh() uses  beta  as the amount
  to decrease  *to*: W <- beta*W

This bug makes the Linux TCP-Illinois get less-aggressive on uncongested network,
hurting performance. Note: since the base beta value is .5, it has no
impact on a congested network.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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