[uClinux-dev] Re: Soft lockup 2.6.23.14-uc0

[David Wu]

On Sat, 09 Feb 2008 08:19:55 -0500, Doug Kehn <rdkehn at yahoo.com> wrote:

> 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.
 from previous work, if a user application does not exit
and still own a socket the soft lockups most likely happen(
2.6.21 kernel). We did not try to fix the problem
but just kill that process. This may be related to close() in the
kernel and not the ethernel driver.
I hope this may help.

>
> Thanks,
> ...doug
>
>
>
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-- 
David Wu