lkml.org 
[lkml]   [1999]   [Feb]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Weird tcp performance differences with 2.0 and 2.2 kernels
   Date: 	Fri, 12 Feb 1999 16:29:55 +0100 (CET)
From: Mike Galbraith <mikeg@weiden.de>

It's the same either on or off. This is something that snuck in
fairly recently. One day I was trying to get to ftp.x.org, and
this happened. I figured they :) were having troubles and ignored
it. When 'their' problem didn't go away in a couple of days, I got
suspicious. When the same exact failure happened with porcupine, I
remembered hearing about /proc/sys/net/ipv4/tcp_timestamps and gave
it a shot. This snuck in after a kernel upgrade, not an isdn
upgrade fwiw.

It's a bug in the other end.

How do I know this? :-) Because now that you mention ftp.x.org I have
seen this problem too and watched the traces carefully. What I saw is
that with timestamps enabled, if there is a dropped packet and either
a fast or normal retransmit happena, ftp.x.org backs off for a _long_
time and takes forever to retransmit.

I think ftp.x.org need to apply any updates necessary to their (what
appears to be a) BSD derived system. It's definately a bug in the
sender (ftp.x.org) and not in Linux-2.2.x

Later,
David S. Miller
davem@redhat.com

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:50    [W:0.032 / U:0.524 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site