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

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Message-Id: <1163156158.3138.677.camel@laptopd505.fenrus.org>
Date:	Fri, 10 Nov 2006 11:55:58 +0100
From:	Arjan van de Ven <arjan@...radead.org>
To:	Andi Kleen <ak@...e.de>
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


> 
> Do we? Where?  AFAIK we just do some resetting after cpu frequency
> changes, but on C3 TSC is just disabled globally.
> 
> That is better than it sounds.

is it?
> 
> 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 ......

-- 
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