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Date: Fri, 28 Mar 2003 09:57:56 -0500 (EST)
From: Zwane Mwaikambo <zwane@linuxpower.ca>
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To: Linux Kernel <linux-kernel@vger.kernel.org>
cc: Linus Torvalds <torvalds@transmeta.com>
Subject: Re: [PATCH][2.5] reproducible smp_call_function/_interrupt cache
 update race.
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On Fri, 28 Mar 2003, Zwane Mwaikambo wrote:

> Hi
> 	I'm not quite sure how to describe this. I have a 3 Processor 
> Pentium 133 system which has been oopsing reliably (i have over 5 of 
> these oopses). What appears to be the problem is that the current memory 
> barrier in smp_call_function is a simple gcc anti optimisation barrier, we 
> really need a memory barrier there so that the other cpu's get the right 
> value when they get IPI'd immediately afterwards. The system was going 
> down reliably under my test load in under 5minutes, i have run with this 
> patch for;
> 
> 02:11:24  up 45 min,  5 users,  load average: 175.21, 174.89, 160.77

 11:00:31  up  8:29,  5 users,  load average: 2.06, 2.28, 2.33

And still going strong, it finally even completed the dbench 128 run 
(first time since 2.5.66 got released).

Linus please apply.

	Zwane
-- 
function.linuxpower.ca
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