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Re: [Xen-devel] How to reduce high latency on PV-on-HVM?

To: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] How to reduce high latency on PV-on-HVM?
From: Pasi Kärkkäinen <pasik@xxxxxx>
Date: Wed, 5 Jan 2011 15:51:36 +0200
Cc: "shen.qilong" <shen.qilong@xxxxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, ?????? <wang.peng@xxxxxxxxxx>
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On Wed, Jan 05, 2011 at 01:47:01PM +0000, Stefano Stabellini wrote:
> On Tue, 4 Jan 2011, shen.qilong wrote:
> > About ping latency in PV-on-HVM
> > I had tried a test to ping between two VM(PV-on-HVM) in the same host 
> > server with bridge model.
> >  
> > I think there would be slightly latency mostly(less than 1ms).
> > But I found that there are too much high latency package (more than 1ms) 
> > in PV-on-HVM + bridge environment.
> >  
> >  
> > The following is the test environment and the test result:
> >  
> > Server uses xen-4.0.0, domain-0 is kernel- and PV-on-HVM is kernel-2.6.x. 
> > The server and client are connected through a same network bridge. 
> >  
> > Can someone help me, or tell me something?
> If you boot your guest kernel with loglevel=9, can you see the following line
> among the boot messages?
> Xen HVM callback vector for event delivery is enabled

Hmm.. is this message message for the optimization available in Xen 4.1 ? 

-- Pasi

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