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

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Date:	Wed, 21 Mar 2007 15:09:30 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Stefan Prechtel <stefan.prechtel@...glemail.com>,
	Andi Kleen <ak@...e.de>,
	Grzegorz Chwesewicz <grzegorz.chwesewicz@...lan.com>,
	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


* 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.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

Acked-by: Ingo Molnar <mingo@...e.hu>

nice work!

	Ingo
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