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

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Date:	Sat, 11 Nov 2006 15:08:52 +0100
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Andi Kleen <ak@...e.de>
Cc:	Andrew Morton <akpm@...l.org>, Ingo Molnar <mingo@...e.hu>,
	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

On Sat, 2006-11-11 at 14:59 +0100, Andi Kleen wrote:
> On Saturday 11 November 2006 14:58, Thomas Gleixner wrote:
> 
> > > 
> > > > > My guess is that some of the checks in there are just broken and need
> > > > > to be fixed.
> > > > 
> > > > It's the unconditional mark_unstable call in ACPI C2 state. /me looks.
> > > 
> > > The system doesn't support C2 states. It's an older single socket Athlon 64 
> > > with VIA chipset. I haven't looked in detail on why it fails.
> > 
> > Does it have cpu freqency changing ?
> 
> Yep. But only OS controlled one (powernow).
> 
> Most likely it happens when ondemand starts doing its thing.

Yes, thats one of the criterias the tsc clocksource is using. I'm
looking into that right now.

	tglx


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