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From: john stultz <johnstul@us.ibm.com>
To: jean-philippe francois <jp.francois@cynove.com>
Cc: Lin Ming <lin@ming.vg>,
	venki@google.com, "H. Peter Anvin" <hpa@zytor.com>,
	linux-acpi@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>,
	jslaby@suse.cz
Subject: Re: System time drifts when processor idle.
Date: Fri, 27 Aug 2010 11:11:48 -0700	[thread overview]
Message-ID: <1282932708.1946.8.camel@work-vm> (raw)
In-Reply-To: <AANLkTikWTLeDLbWWi-LJDD5SRAFN60v5065Vc_wGoY5N@mail.gmail.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?

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


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

thanks
-john



  reply	other threads:[~2010-08-27 18:11 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-08-20  8:55 System time drifts when processor idle jean-philippe francois
2010-08-21  3:58 ` Lin Ming
2010-08-21  3:58   ` Lin Ming
2010-08-23  8:46   ` jean-philippe francois
2010-08-23  8:46     ` jean-philippe francois
2010-08-23 22:17     ` john stultz
2010-08-23 22:17       ` john stultz
2010-08-24  7:08       ` jean-philippe francois
2010-08-27 14:12         ` jean-philippe francois
2010-08-27 18:11           ` john stultz [this message]
2010-08-28  0:10             ` Venkatesh Pallipadi
2010-08-28  1:09               ` john stultz
2010-08-28  1:09                 ` john stultz
2010-08-28 12:45                 ` jean-philippe francois
2010-08-28 15:19                   ` Venkatesh Pallipadi
2010-09-02 11:45                     ` jean-philippe francois
2010-08-30  8:03                 ` jean-philippe francois
2010-09-03 12:23             ` jean-philippe francois
2010-09-09 17:42               ` john stultz
2010-09-13 13:04                 ` jean-philippe francois
2010-09-13 13:04                   ` jean-philippe francois
2010-12-06 12:55                   ` jean-philippe francois
2010-12-06 12:55                     ` jean-philippe francois

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