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Re: [Xen-users] Gigabit Interface - XEN Full Virtualization

To: "Mark Williamson" <mark.williamson@xxxxxxxxxxxx>
Subject: Re: [Xen-users] Gigabit Interface - XEN Full Virtualization
From: "Artur Baruchi" <mail.baruchi@xxxxxxxxx>
Date: Sun, 2 Dec 2007 09:04:32 -0200
Cc: Sadique Puthen <sputhenp@xxxxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx
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Hi Mark,

Unfortunately, I did some tests, and even my nic being a giga and my
lan supporting giga, my full virtualized domain wasnt able to pass
100Mb/sec. My paravirtualized guests had a very good performance in
this environment.


Artur Baruchi

On Dec 2, 2007 12:34 AM, Mark Williamson <mark.williamson@xxxxxxxxxxxx> wrote:
> > > I noted that the lspci output are different, and I would like to know,
> > > how can I make my xen virtual machine see the same Hardware, so I can
> > > force a 1000 Full speed.
> >
> > You can't get Gigabit speed for your NIC in HVM.  Whatever network cards
> > you have on the physical system, it's emulated as a 10/100 mbps Realtek
> > card to the HVM.
> >
> > Use paravirtualized drivers for HVMs to enhance the network card
> > performance and throughput, but don't expect 1000 mbps.  :-)
> The virtual machine won't have hardware matching the physical system; it just
> sees whatever hardware Xen is emulating.
> Xen doesn't emulate a GigE network card so you won't be able to see one in the
> guest.  However, I suspect that the 10/100mbps card will be able to transmit
> above that speed if your machine can emulate the card fast enough: because
> there's not a real hardware 100mbps ethernet card there, there actually
> shouldn't be anything limiting the speed to that.
> As Sadique mentioned, if you use paravirtualised drivers in your guest (either
> by using a PV guest or by installing paravirt network drivers in an HVM
> guest) you could potentially increase the throughput and decrease the CPU
> overhead further.
> Cheers,
> Mark
> --
> Dave: Just a question. What use is a unicyle with no seat?  And no pedals!
> Mark: To answer a question with a question: What use is a skateboard?
> Dave: Skateboards have wheels.
> Mark: My wheel has a wheel!

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