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

[Riccardo Veraldi <Riccardo.Veraldi@xxxxxxxxxxxx>]

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...

https://calcolo.infn.it/wiki/doku.php?id=network_overbust_compilare_e_installare_il_kernel_module_con_il_supporto_netfront

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

Riccardo



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.
>
> Thanks,
>
> Att.
> 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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>   

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