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