linux-kernel - Re: clocksource change of behavior in 2.6.22 compared to 2.6.20 causes massive system clock slowdown

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Date:	Tue, 10 Jul 2007 10:28:20 -0700
From:	john stultz <johnstul@...ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Alessandro Suardi <alessandro.suardi@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: clocksource change of behavior in 2.6.22 compared to 2.6.20
	causes massive system clock slowdown

On Tue, 2007-07-10 at 00:29 -0700, Andrew Morton wrote:
> On Mon, 9 Jul 2007 16:27:59 +0200 "Alessandro Suardi" <alessandro.suardi@...il.com> wrote:
> 
> > My oldish AMD K7-800's clock began falling behind after
> >  rebooting from 2.6.20 (and 109 days uptime with a spotless
> >  clock) into 2.6.22; time lost is about four minutes each hour.
> > 
> > Turns out that 2.6.22 marks my TSC as unstable and starts
> >  using PIT instead. Rebooting 2.6.22 with clocksource=tsc
> >  gets the original stable system time back.

Alessandro,
Can you send me dmesg output for 2.6.20 and 2.6.22 (without
clocksource=tsc)?

thanks
-john

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