linux-kernel - Re: PMTMR running too fast

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Message-Id: <1165347242.8326.15.camel@localhost>
Date:	Tue, 05 Dec 2006 11:34:01 -0800
From:	john stultz <johnstul@...ibm.com>
To:	Ian Campbell <ijc@...lion.org.uk>
Cc:	linux-kernel@...r.kernel.org, Andi Kleen <ak@...e.de>
Subject: Re: PMTMR running too fast

On Tue, 2006-12-05 at 07:41 +0000, Ian Campbell wrote:
> On Mon, 2006-12-04 at 12:14 -0800, john stultz wrote:
> > I don't have a dev box to test on at the moment, but here's a quick hack
> > attempt at re-adding the code. Does the following work for you? 
> 
> I get:
>         PM-Timer running at invalid rate: 200% of normal - aborting.
>         ...
>         Time: pit clocksource has been installed.
>         
> Without the clocksource parameter.

Great!

> Should tsc be preferred to pit though?

Depends on your system. If C2/C3 or cpufreq state changes are detected,
we mark the tsc as unstable. 

It sounds as if from your earlier email the TSC works fine, so we might
want to look at what's making the system think its not ok. I probably
need to add a message as to why it was disqualified. However, that's a
separate issue from the last patch.

Thanks for the testing!

-john




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