[Xen-users] RE: GPLPV on opensolaris, finally!

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

> 
> On Thu, Mar 12, 2009 at 3:28 PM, James Harper
> <james.harper@xxxxxxxxxxxxxxxx> wrote:
> >> Without GPLPV : dom0->domU 38.8 Mbps, domU->dom0 24.4 Mbps,
> >> With GPLPV : dom0->domU 148 Mbps, domU->dom0 446 Mbps
> >>
> >> This is still much lower compared to Linux dom0 btw:
> >> dom0->domU 781 Mbps, domU->dom0 834 Mbps
> >
> > How does the PV performance differ? I don't know enough about the
> 
> I'm beginning to see a pattern to your answers :D
> So let me get this straight. GPLPV performance should be somewhere in
> the range on Linux HVM with PV drivers, and both of them should be
> lower than Linux PV right?

PV on HVM could in theory be as fast as PV Linux, but it shouldn't be
faster. If PV performance was also low then GPLPV is probably the long
place to be looking for a problem...

> > opensolaris network stack, but filtering isn't getting in the way or
> > something is it?
> 
> On that opensolaris dom0, Linux PV guest has this performance:
> dom0->domU 556 Mbps, domU->dom0 631Mbps
> 
> which is lower compared to typical Linux PV on Linux dom0 performance.

That is the sort of target I'd expect to be aiming for with windows
PV...

> 
> Could it be because  dom0 <-> domU communication on Opensolaris still
> involves physical NIC as the dom0 IP is located on dom0 NIC (which is
> different from Linux, where dom0 IP can be on the bridge without
> involving any physical NIC)?

I don't know. I'm familiar with the Linux network stack but not so much
the solaris one.

> 
> I'll try HVM Linux later (takes somewhat longer to setup).
> 

If PV on Linux HVM is also slow then there could be a problem unrelated
to GPLPV...

James


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