From owner-freebsd-hackers@FreeBSD.ORG  Fri Oct  3 00:45:31 2003
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Date: Fri, 3 Oct 2003 11:45:27 +0400 (MSD)
From: Igor Sysoev <is@rambler-co.ru>
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To: Will Froning <wfroning@pacific.edu>
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cc: freebsd-hackers@freebsd.org
Subject: Re: 4.6.2-p23 and [tcp bad cksum]
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On Thu, 2 Oct 2003, Will Froning wrote:

> > Which is which? 
> 
> The 2 boxes that didn't work, one had a Fiber EM and the other had a
> copper BGE running at 100 full (Dell 1650 and 2550 respectively)
> 
> The 4.9-pre is a Fiber EM (dell 2600).
> 
> > Which one was causing large amount of checksum errors?
> 
> Both of the 4.6.2 boxes.
> 
> > Which one fixed it? etc etc etc etc.
> 
> Upgrading the 4.6.2 boxes to 4.8 fixed the problem allowed the messages
> to pass through.  Although I didn't record a tcpdump when it started
> working, as it scrolled by I noticed a reduction in the number of
> errors.

I'm not sure but I think you had built your kernels with -O2 and encountered
a seldom bug that was fixed in 4.6-STABLE:
http://docs.freebsd.org/cgi/getmsg.cgi?fetch=727930+0+/usr/local/www/db/text/2002/cvs-all/20020707.cvs-all


Igor Sysoev
http://sysoev.ru/en/