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Date: Wed, 18 Sep 2002 13:00:58 +0200
Subject: Re: Oops in sched.c on PPro SMP
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Cc: linux-kernel@vger.kernel.org, mingo@redhat.com
To: Andrea Arcangeli <andrea@suse.de>
From: Peter Waechtler <pwaechtler@mac.com>
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Am Dienstag den, 17. September 2002, um 19:41, schrieb Andrea Arcangeli:

> On Tue, Sep 17, 2002 at 07:11:52PM +0200, Peter Waechtler wrote:
>> Once I had a machine check exception - sine then I lowered the CPU 
>> clock.
>> After the box was running fine with 180MHz I switched to 200MHz
>> (yes, I overclocked the CPUs with 233MHz 2 or 3 years - without 
>> problems)
>
> I guess this explain the corruption. Please make sure the cpu are not
> overclocked at all and then try to reproduce. You cannot choose 180mhz
> or 200mhz randomly based on which kernel crashes or not, if the cpu are
> 180mhz ppro you should use 180mhz only, 200mhz will break.  It won't
> break so easily as 233mhz, but it will, the timings are strict on smp.
> So please try to reproduce at 180mhz if the cpu should run at 180mhz.
>
> I don't want to sound boring but please next times try if you can
> reproduce on non overclocked hardware before reporting anything to l-k.
>

They are 200MHz PPros. So don't be bored.
To minimize the risk, I underclocked them, eh?

I slowed down memory timings - the box survived one night - but it
would be too early to count on this.

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