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Date: Fri, 8 Jul 2005 11:45:31 +0200
From: Ingo Molnar <mingo@elte.hu>
To: William Weston <weston@sysex.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Real-Time Preemption, -RT-2.6.12-final-V0.7.51-08
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* Ingo Molnar <mingo@elte.hu> wrote:

> > > -51-06 and -51-08 are looking stable on the UP Athlon box with the 
> > > following patch which causes edge triggered hardirqs to be masked when 
> > > pending _and/or_ disabled (instead of both pending _and_ disabled) and 
> > > backs out a change from -50-44 that prevents pending edge triggered 
> > > irqs from being unmasked:
> > 
> > ok, you are right, the edge case was mishandled - but i think it was 
> > already mishandled upstream, we just never (or rarely) triggered it.  
> > I've reworked this area based on your patch, could you check -51-15, 
> > does it work for you?
> 
> if it doesnt work, could you disable CONFIG_X86_IOAPIC_FAST?

or rather, please try -51-16. One of my testsystems produced weird 
interrupt storms, which were caused by the IOAPIC_POSTFLUSH 
optimization. In -51-16 i've turned that optimization off, globally.  
Maybe this explains some of the other lockups reported.

	Ingo