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SubjectRe: Weird tcp performance differences with 2.0 and 2.2 kernels
I spent quite a bit of time working tracking down an instance of this
problem, and in my case it was not NetBSD (as I originally thought)
but a router.

--
Raul

David Miller <davem@twiddle.net> wrote:
> 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
>
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