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

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Message-Id: <1163155026.3138.673.camel@laptopd505.fenrus.org>
Date:	Fri, 10 Nov 2006 11:37:05 +0100
From:	Arjan van de Ven <arjan@...radead.org>
To:	Andi Kleen <ak@...e.de>
Cc:	john stultz <johnstul@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...l.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Len Brown <lenb@...nel.org>,
	Roman Zippel <zippel@...ux-m68k.org>
Subject: Re: [patch 13/19] GTOD: Mark TSC unusable for highres timers

On Fri, 2006-11-10 at 11:30 +0100, Andi Kleen wrote:
> On Friday 10 November 2006 11:28, Arjan van de Ven wrote:
> > On Fri, 2006-11-10 at 06:10 +0100, Andi Kleen wrote:
> > > Very sad. This will make a lot of people unhappy, even to the point
> > > where they might prefer disabling noidlehz over super slow gettimeofday. 
> > > I assume you at least have a suitable command line option for that, right?
> > > 
> > > Can we get a summary on which systems the TSC is considered unstable?
> > 
> > the part where it stops in idle...
> 
> That is handled by if (intel && C3 available) disable

I'm not so sure it doesn't stop on AMD; the ACPI spec at least allows
it; just that I've seen few AMD CPUs that actually have C3, but that
could be a matter of time.


-- 
if you want to mail me at work (you don't), use arjan (at) linux.intel.com
Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org

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