From: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
To: Anthony Liguori <anthony-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>
Cc: kvm-devel <kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
Subject: Re: Erratic gettimeofday() behavior with KVM and newer Linux kernels?
Date: Tue, 19 Jun 2007 17:18:32 +0300 [thread overview]
Message-ID: <4677E5B8.3070208@qumranet.com> (raw)
In-Reply-To: <4677E4BF.3060000-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>
Anthony Liguori wrote:
> Avi Kivity wrote:
>> Anthony Liguori wrote:
>>> It's pretty erratic. If I run if a few times at any rate, sometimes
>>> I get 0.0 and sometimes I get a more sane result.
>>
>> I expect the newer kernel is sometimes disqualifying the timestamp
>> counter from being used as a clocksource. Running pinned to a cpu
>> may improve things.
>
> Things get better if I disable the PM timer and if I pin to a single CPU.
>
Can you post the magic command line for future reference?
--
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next prev parent reply other threads:[~2007-06-19 14:18 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-18 21:13 Erratic gettimeofday() behavior with KVM and newer Linux kernels? Anthony Liguori
[not found] ` <4676F587.8030802-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>
2007-06-19 7:43 ` Avi Kivity
[not found] ` <46778917.90803-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-06-19 14:14 ` Anthony Liguori
[not found] ` <4677E4BF.3060000-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>
2007-06-19 14:18 ` Avi Kivity [this message]
[not found] ` <4677E5B8.3070208-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-06-19 14:31 ` Anthony Liguori
[not found] ` <4677E8D4.6010904-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>
2007-06-19 14:53 ` Avi Kivity
[not found] ` <4677EDF9.3000202-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-06-19 15:03 ` Anthony Liguori
[not found] ` <4677F04F.7070005-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>
2007-06-19 15:07 ` Avi Kivity
[not found] ` <4677F14C.8000701-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-06-19 15:14 ` Anthony Liguori
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