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

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Date:	Fri, 10 Nov 2006 12:28:27 +0100
From:	Andi Kleen <ak@...e.de>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Andrew Morton <akpm@...l.org>, Ingo Molnar <mingo@...e.hu>,
	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

On Friday 10 November 2006 11:55, Arjan van de Ven 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 ......

Well those will be handled eventually. Currently they just have
a slower gettimeofday.

But the majority of systems is not impacted.

BTW if someone really wants to have fast gettimeofday on a blade
they can just disable C3 and force TSC.

-Andi
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