From: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
To: Feng Wang <yeti-fOMaevN1BEbsJZF79Ady7g@public.gmane.org>
Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: Re: So strange, time becomes skew when VM is running
Date: Mon, 22 Oct 2007 11:59:14 +0200 [thread overview]
Message-ID: <471C7472.6050906@qumranet.com> (raw)
In-Reply-To: <393046937.11701-pcTkQGq1WEvM1kAEIRd3EQ@public.gmane.org>
Feng Wang wrote:
> When I started up two KVM VMs upon SLES 10 OS based on a multi-core hardware
> platform and ran some computing-intensive tasks (e.g. SPECjbb2005) within each VM,
> I found that something confusing me very much.
> The VM which is first started is running as well as it runs without other VMs,
>
The first VM is probably using the RTC as the time source;
unfortunately only one process can use the RTC at a time. If you use
newer kvms (and newer host kernels), and configure HZ appropriately
(dynamic tick or HZ=1000), then timing should be much better for all VMs.
--
error compiling committee.c: too many arguments to function
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prev parent reply other threads:[~2007-10-22 9:59 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-22 9:55 So strange, time becomes skew when VM is running Feng Wang
[not found] ` <393046937.11701-pcTkQGq1WEvM1kAEIRd3EQ@public.gmane.org>
2007-10-22 9:59 ` Avi Kivity [this message]
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