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Date: Wed, 4 Feb 2004 13:08:39 -0800
From: "David S. Miller" <davem@redhat.com>
To: Andrew Morton <akpm@osdl.org>
Cc: jfaulkne@ccs.neu.edu, linux-kernel@vger.kernel.org, kraxel@bytesex.org
Subject: Re: major network performance difference between 2.4 and 2.6.2-rc2
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On Wed, 4 Feb 2004 12:54:44 -0800
Andrew Morton <akpm@osdl.org> wrote:

> Jim Faulkner <jfaulkne@ccs.neu.edu> wrote:
> >   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
> >   3 root      35  19     0    0    0 S 45.9  0.0   0:46.98 ksoftirqd/0
> >   6 root       5 -10     0    0    0 S 43.3  0.0   1:56.63 events/0
> >   12008 dogshu 15   0  4800 2356 3828 S  5.3  0.2   0:05.98 proftpd
> >   12 root      15   0     0    0    0 S  0.3  0.0   0:00.41 pdflush
> >   9778 root    16   0  5888 1724 5516 R  0.3  0.2   0:00.12 sshd
> > 
> > the load before that network transfer was 0.01, and the load after the
> > network transfer was 1.45.
> 
> Could be a networking problem, but boy that's a lot of CPU time.

Andrew maybe something bolixed in the MAX_SOFTIRQ_RESTART stuff
we put into kernel/softirq.c?  Just a guess...