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

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Date:	Fri, 3 Sep 2010 14:23:32 +0200
From:	jean-philippe francois <jp.francois@...ove.com>
To:	john stultz <johnstul@...ibm.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.

2010/8/27 john stultz <johnstul@...ibm.com>:
> 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?
>

Hi,

The same bug happens with clock=acpi_pm.
My apologies for a previous mail where I said it was not hapenning with acpi_pm.

With both clock, the timekeeping gap augments by amount of 5 minutes.

Jean-Philippe François
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