linux-kernel - Re: Soft lockup 2.6.23.14-uc0

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Message-ID: <65230.82874.qm@web52008.mail.re2.yahoo.com>
Date:	Sat, 9 Feb 2008 05:19:55 -0800 (PST)
From:	Doug Kehn <rdkehn@...oo.com>
To:	Mikael Pettersson <mikpe@...uu.se>
Cc:	linux-kernel@...r.kernel.org, uClinux <uclinux-dev@...inux.org>
Subject: Re: Soft lockup 2.6.23.14-uc0

Hi Mikael/All,

--- Mikael Pettersson wrote:


> Anyway, I can think of two things:
> 
> 1. There was some very recent patches by Peter
> Zijlstra
>    addressing hrtimer breakage on arm and some other
>    archs in 2.6.24-git. If uclinux has backported
> some
>    of that stuff then it might explain this issue.
> 
> 2. There is a new native Linux driver for ixp4xx
>    ethernet. Patches for the 2.6.23.14 kernel can
>    be found in the nslu2-linux group's subversion
>    repository. (You'll need new firmware files
> though.)
>    Replacing Intel's IXP400 drivers with this driver
>    should at least tell you if the lockups are
>    related to your use of the Intel drivers.
> 

I'm working through Mikael's suggestions.

A new piece of information is that the soft lockups
only occur when the IXP420 is transmitting.  I started
using unidirectional streams; I don't observe soft
lockups when receiving.  I only observe them when
transmitting.

Thanks,
...doug



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