linux-kernel - Re: Regression in 2.6.27 caused by commit bfc0f59

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Message-ID: <alpine.LFD.1.10.0809012208010.3243@apollo.tec.linutronix.de>
Date:	Mon, 1 Sep 2008 22:09:17 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Larry Finger <Larry.Finger@...inger.net>
cc:	LKML <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Alok Kataria <akataria@...are.com>,
	Michael Buesch <mb@...sch.de>
Subject: Re: Regression in 2.6.27 caused by commit bfc0f59

On Mon, 1 Sep 2008, Larry Finger wrote:
> The timed sleep is as accurate as I can measure.
> 
> I put in some test prints. The value of pm2 is zero when the else branch of
> the "if (hpet)" is entered; however, pm1 is 15768471. When we reach the
> do_div(tsc2, tsc1) statement, tsc2 is zero, which I think means that the two
> calls to tsc_read_refs() are returning the same junk value.

Ok, so the pmtimer is probably detected later as unusable and disabled.
Please check your logs for: 
"PM-Timer had inconsistent results:"

Thanks,

	tglx
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