linux-kernel - Re: 2.6.27.7 built for Geode: Clock drift

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Date:	Sat, 06 Dec 2008 07:09:16 +0100
From:	Harald Dunkel <harald.dunkel@...nline.de>
To:	john stultz <johnstul@...ibm.com>
CC:	Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.27.7 built for Geode: Clock drift

john stultz wrote:
> 
> For both configs, can you run:
>    cat /sys/devices/system/clocksource/clocksource0/available_clocksource
> and:
>    cat /sys/devices/system/clocksource/clocksource0/current_clocksource
> 
> Then send back the output?
> 

Sure. For 486:

% cat /sys/devices/system/clocksource/clocksource0/available_clocksource
pit jiffies
% cat /sys/devices/system/clocksource/clocksource0/current_clocksource
pit


For Geode (clock is running too fast):
% cat /sys/devices/system/clocksource/clocksource0/available_clocksource
jiffies
% cat /sys/devices/system/clocksource/clocksource0/current_clocksource
jiffies


dmesg says for Geode:

:
TSC: Unable to calibrate against PIT
TSC: No reference (HPET/PMTIMER) available
Marking TSC unstable due to could not calculate TSC khz
:


Regards

Harri

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