linux-kernel - Re: [PATCH 00 of 31] x86: unification and xen updates

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Message-ID: <20080319235212.GA22786@elte.hu>
Date:	Thu, 20 Mar 2008 00:52:12 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Ian Campbell <ijc@...lion.org.uk>
Subject: Re: [PATCH 00 of 31] x86: unification and xen updates

* Jeremy Fitzhardinge <jeremy@...p.org> wrote:

>> simple bootup triggered it.
>
> Haven't managed to repro it yet, but DEBUG_PAGE_ALLOC turned up 
> another case of doing tlb flushes with preempt on:

turns out that i have another bug which causes a screaming IRQ#0 that 
floods the box at 70K irqs/sec. That is what triggered that crash in 
your patch most likely.

so either figure out the bug by review or try turning your IRQ#0 into a 
screaming one for debug purposes. (hint: turning irq#0's trigger mode 
from 'edge' to 'level' in mpparse.c or ioapic.c does wonders to that end 
;-)

	Ingo
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