linux-kernel - Re: [patch 13/19] GTOD: Mark TSC unusable for highres timers

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Date:	Fri, 10 Nov 2006 12:13:16 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Andi Kleen <ak@...e.de>, Andrew Morton <akpm@...l.org>,
	tglx@...utronix.de, john stultz <johnstul@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>, Len Brown <lenb@...nel.org>,
	Roman Zippel <zippel@...ux-m68k.org>
Subject: Re: [patch 13/19] GTOD: Mark TSC unusable for highres timers


* Arjan van de Ven <arjan@...radead.org> wrote:

> > Most systems don't have C3 right now. And on those that have 
> > (laptops) it tends to be not that critical because they normally 
> > don't run workload where gettimeofday() is really time critical (and 
> > nobody expects them to be particularly fast anyways)
> 
> and that got changed when the blade people decided to start using 
> laptop processors ......

and some systems disable the lapic in C2 already: BIOSs started doing 
lowlevel-C3 in their C2 functionality and lie to the OS about it.

	Ingo
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