From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gleb Natapov <gleb@redhat.com>
Subject: Re: performance trouble
Date: Tue, 14 Feb 2012 15:40:30 +0200
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Cc: David Cure <kvm@cure.nom.fr>, kvm@vger.kernel.org,
	Vadim Rozenfeld <vrozenfe@redhat.com>
To: Avi Kivity <avi@redhat.com>
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On Tue, Feb 14, 2012 at 03:32:16PM +0200, Avi Kivity wrote:
> On 02/10/2012 12:09 PM, David Cure wrote:
> > 		hello,
> >
> > Le Sun, Feb 05, 2012 at 11:38:34AM +0200, Avi Kivity ecrivait :
> > > 
> > > Please post a trace as documented in http://www.linux-kvm.org/page/Tracing.
> >
> > 	I made the trace : started just before the slow function launch
> > and stoped just after. I start only one VM with 2 vcpus/16G RAM and only one
> > user connected to the VM to launch the test.
> >
> > 	The trace file is too big to post here, I gzip it and the file
> > is available here : http://www.roullier.net/report.txt.gz
> >
> > 	I hope you can find something strange.
> >
> 
> It's reading the HPET like crazy.  There are also tons of interrupts. 
> Please use the windows performance tools to see which devices trigger
> these interrupts.
> 
> The HPET issue will be fixed by the hyper-V enlightenments, but these
> will take some time to cook.
> 
Try to add -no-hpet to qemu command line and see if it helps.

> You can also try vhost-net to improve networking latency.
> 
> -- 
> error compiling committee.c: too many arguments to function
> 
> --
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--
			Gleb.