linux-kernel - Re: [PATCH] i386: disable local apic timer via command line or dmi quirk

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Date:	Wed, 21 Mar 2007 16:14:33 +0100
From:	"Grzegorz Chwesewicz" <grzegorz.chwesewicz@...lan.com>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>
Cc:	Stefan Prechtel <stefan.prechtel@...glemail.com>,
	Andi Kleen <ak@...e.de>, linux-kernel@...r.kernel.org,
	Len Brown <lenb@...nel.org>, john stultz <johnstul@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Adrian Bunk <bunk@...sta.de>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [PATCH] i386: disable local apic timer via command line or dmi quirk

On Wed, 21 Mar 2007 15:09:30 +0100, Ingo Molnar wrote
> * Thomas Gleixner <tglx@...utronix.de> wrote:
> 
> > The local APIC timer stops to work in deeper C-States. This is handled 
> > by the ACPI code and a broadcast mechanism in the clockevents / tick 
> > managment code.
> > 
> > Some systems do not expose the deeper C-States to the kernel, but 
> > switch into deeper C-States behind the kernels back. This delays the 
> > local apic timer interrupts for ever and makes the systems unusable.
> > 
> > Add a command line option to disable the local apic timer and a dmi 
> > quirk for known broken systems.

Confirming that my machine on 2.6-git with this patch works just like on
2.6.20. Great work.

--
Greetings - Grzegorz Chwesewicz

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