On Wed, 5 Jan 2011, Pasi Kärkkäinen wrote:
> 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-2.6.32.13 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 ?
>
Nope, it is for the basic optimization that is in the xen-4.0-testing
tree too.
Looking more closely, it should be present in 4.0.1 but not in 4.0.0, so
it is unlikely you have it.
It would be interesting to do the same test on a more recent 4.0.x
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