From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gleb Natapov <gleb@redhat.com>
Subject: Re: performance trouble
Date: Tue, 20 Mar 2012 11:45:41 +0200
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Cc: Avi Kivity <avi@redhat.com>, kvm@vger.kernel.org,
	Vadim Rozenfeld <vrozenfe@redhat.com>
To: David Cure <kvm@cure.nom.fr>
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On Tue, Mar 20, 2012 at 10:32:20AM +0100, David Cure wrote:
> 		hello,
> 
> Le Mon, Mar 19, 2012 at 12:51:34PM +0200, Gleb Natapov ecrivait :
> >
> > Can you run the same test on Linux guest and on Windows vm with 1 cpu?
> > I see a lot of IPIs between vcpus.
> 
> 	I run the same slowly fonction (to remember the guest is
> Windows2008R2 64bits). The report is here :
> 	http://www.roullier.net/Report/report-3.2-vhost-net-1vcpu.txt.gz
> 
> 	and the response time is ~13s.
>   

This is without -no-hpet :) Also I hope you are not measuring time while
tracing since it supposed to be slower.  Can you please try to run with
-cpu host,-hypervisor and -no-hpet and see if times are better.

--
			Gleb.