linux-kernel - Re: System clock runs too fast after 2.6.27 -> 2.6.28.1 upgrade

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Date:	Wed, 21 Jan 2009 22:07:26 +0100
From:	Miklos Vajna <vmiklos@...galware.org>
To:	john stultz <johnstul@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Gabriel C <nix.or.die@...glemail.com>,
	CSÉCSY László <boobaa@...galware.org>
Subject: Re: System clock runs too fast after 2.6.27 -> 2.6.28.1 upgrade

On Wed, Jan 21, 2009 at 12:00:57PM -0800, john stultz <johnstul@...ibm.com> wrote:
> Could you send the output from:
>    cat /sys/devices/system/clocksource/clocksource0/current_clocksource
>    cat /sys/devices/system/clocksource/clocksource0/available_clocksource
> 
> For both kernels on the affected hardware ?

Output when no related kernel parameters are used:

2.6.28.1:

$ cat /sys/devices/system/clocksource/clocksource0/current_clocksource
tsc
$ cat /sys/devices/system/clocksource/clocksource0/available_clocksource
tsc pit jiffies

2.6.27.10:

$ cat /sys/devices/system/clocksource/clocksource0/current_clocksource
acpi_pm
$ cat /sys/devices/system/clocksource/clocksource0/available_clocksource
acpi_pm jiffies tsc

So it seems the problem is that acpi_pm is no longer available.

> Also could you attach the dmesg for 2.6.27 on the same hardware?

dmesg-2.6.27 and config-2.6.27 attached.

View attachment "dmesg-2.6.27" of type "text/plain" (26250 bytes)

View attachment "config-2.6.27" of type "text/plain" (89979 bytes)

Content of type "application/pgp-signature" skipped