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

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Message-ID: <20061110111231.GB3291@elf.ucw.cz>
Date:	Fri, 10 Nov 2006 12:12:31 +0100
From:	Pavel Machek <pavel@....cz>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Andrew Morton <akpm@...l.org>, tglx@...utronix.de,
	Andi Kleen <ak@...e.de>, john stultz <johnstul@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>, Len Brown <lenb@...nel.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Roman Zippel <zippel@...ux-m68k.org>
Subject: Re: [patch 13/19] GTOD: Mark TSC unusable for highres timers

Hi!

> > If so, could that function use the PIT/pmtimer/etc for working out if 
> > the TSC is bust, rather than directly using jiffies?
> 
> there's no realiable way to figure out the TSC is bust: some CPUs have a 
> slight 'skew' between cores for example. On some systems the TSC might 
> skew between sockets. A CPU might break its TSC only once some 

But we could still do a whitelist?
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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