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Date: Thu, 20 Jun 2002 19:03:40 +0200
From: Andrea Arcangeli <andrea@suse.de>
To: linux-kernel@vger.kernel.org
Cc: andy@spylog.ru
Subject: Re: 2.4.19pre10aa3
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On Thu, Jun 20, 2002 at 03:19:51PM +0200, Andrea Arcangeli wrote:
> On Thu, Jun 20, 2002 at 03:44:59PM +0400, Andrey Nekrasov wrote:
> > Hello Andrea Arcangeli,
> > 
> > 
> > Kernel 2.4.19pre10aa3 + hidden_arp (from LVS)
> > 
> > 
> > 
> > ...
> > Intel(R) PRO/100 Fast Ethernet Adapter - Loadable driver, ver 1.8.38
> > Copyright (c) 2002 Intel Corporation
> > 
> > eth0: Intel(R) 8255x-based Ethernet Adapter
> >   Mem:0xfb101000  IRQ:18  Speed:100 Mbps  Dx:Full
> >   Hardware receive checksums enabled
> >   cpu cycle saver enabled
> > ...
> > 
> > ...
> > eth0 e100_wait_exec_cmd: Wait failed.
> > hw tcp v4 csum failed
> > hw tcp v4 csum failed
> > hw tcp v4 csum failed
> > hw tcp v4 csum failed
> > hw tcp v4 csum failed
> > hw tcp v4 csum failed
> > hw tcp v4 csum failed
> > ...
> > 
> > 
> > Than this message is caused? It something serious also can be problems?
> 
> probably a driver issue with hw checksum. btw interestingly the stack
> computes the cksum by hand for every tcp incoming packet (unless
> ip_summed is set by the driver to CHECKSUM_UNNECESSARY), this is how it
> noticed the hw checksum was wrong. I guess it's either an e100 driver
> issue, or an hardware issue. Maybe it's setting DF_CSUM_OFFLOAD for your
> card despite your hardware doesn't support that feature, or maybe
> there's something wrong in the logic that sets the skb->csum.

you may want to try again with aa4, it has a newer e100 driver taken
from jam2 that might make difference here.

Andrea
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