I'm using the gplpv passthru driver now so it's using my nic directly rather than a virtual Realtek 100Mbps one and I'm getting much better transfer speeds - a recommendation from the Xen mailing list.
Regularly getting 120Mbps drag and drop to a file share on a 2k8R2 server a thousand miles away.
Was getting 25Mbps with the virtual Realtek.
--Russell
> -----Original Message-----
> From: centos-bounces@xxxxxxxxxx [mailto:centos-bounces@xxxxxxxxxx] On
> Behalf Of Nico Kadel-Garcia
> Sent: Wednesday, 16 February 2011 3:42 p.m.
> To: CentOS mailing list
> Subject: Re: Virtualization supporting 1000Mbps nics?
>
> On Mon, Feb 14, 2011 at 2:34 PM, Smithies, Russell
> <Russell.Smithies@xxxxxxxxxxxxxxxx> wrote:
> > I've got xen-3.0.3-105.el5_5.5 running on Centos 5.5 and all is
> running
> > smooth but I notice that any VMs running under it only have access to
> > Realtek RTL8139C at 100 Mbps nics.
>
> In general, don't bother. Let the virtualization server handle all the
> cute features of the network interfaces, because it's going to
> *anyway* as part of its role translating the kernel operations of the
> virtualized driver into real hardware interactions with the NIC you
> actually use.
>
> > We have 4 x 1G nics configured in a port channel so I'd really like
> to be
> > able to give my VMs 1000Mbps nics.
>
> Actually test the performance, and if possible, use a para-virtualized
> kernel. You should see surprisingly good performance.
>
> > Does anyone know if this is possible and how to do it?
> >
> > If not, does KVM support faster nics because at this point it would
> be
> > fairly simple to change.
>
> See above. In reality, I'll be surprised if you don't easily
> outperform a physical RealTek device.
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