linux-kernel - Re: nmi_watchdog fix for x86

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Date:	Tue, 2 Oct 2007 00:47:12 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Andi Kleen <ak@...e.de>
cc:	Arjan van de Ven <arjan@...radead.org>,
	David Bahi <dbahi@...ell.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-rt-users@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Gregory Haskins <GHaskins@...ell.com>
Subject: Re: nmi_watchdog fix for x86_64 to be more like i386

On Tue, 2 Oct 2007, Andi Kleen wrote:
> 
> > OTOH, the accounting hook would allow us to remove the IRQ#0 -> CPU#0
> > restriction. Not sure whether it's worth the trouble.
> 
> Some SIS chipsets hang the machine when you migrate irq 0 to another
> CPU. It's better to keep that Also I wouldn't be surprised if there are some
> other assumptions about this elsewhere.
> 
> Ok in theory it could be done only on SIS, but that probably would really
> not be worth the trouble

Agreed.

I just got a x8664-hrt report, where I found the following oddity:

 0:       1197     172881   IO-APIC-edge      timer

That's one of those infamous AMD C1E boxen. Strange, all my systems have 
IRQ#0 on CPU#0 and nowhere else. Any idea ?

	tglx

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