linux-kernel - Re: System time drifts when processor idle.

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Message-ID: <1282932708.1946.8.camel@work-vm>
Date:	Fri, 27 Aug 2010 11:11:48 -0700
From:	john stultz <johnstul@...ibm.com>
To:	jean-philippe francois <jp.francois@...ove.com>
Cc:	Lin Ming <lin@...g.vg>, venki@...gle.com,
	"H. Peter Anvin" <hpa@...or.com>, linux-acpi@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>, jslaby@...e.cz
Subject: Re: System time drifts when processor idle.

On Fri, 2010-08-27 at 16:12 +0200, jean-philippe francois wrote:
> My Timekeeping bug is still present, here is an updated script and log.
> I am willing to make test, but I don't know what kind of debugging
> info is needed.
>
> cat /sys/devices/system/clocksource/clocksource0/available_clocksource
> hpet acpi_pm 
> cat /sys/devices/system/clocksource/clocksource0/current_clocksource
> hpet

Huh. hpet was not what I would have expected.


So first, two experiments: 

1) Does booting with "clock=acpi_pm" cause the issue to disappear?

2) Does booting with "nohz=off" cause the issue to disappear?


Venkatesh: You have any experience with HPETs that halt in idle?

thanks
-john


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