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

if you compile the netfront drivers on your guest kernel and load them
as kernel module on your guests, you will have gigabit speed on a fully virtualized
virtual machine, hust use netfront and not ioemu then load
the kernel drivers on the virtual machine.
I have written something about it but it is in italian.
If you understand italian...


you should understand the way to do it even if it is written in italian.

I can translate in english if really it is needed


Artur Baruchi ha scritto:
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.


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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