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Old 02-14-2011, 06:46 PM
"compdoc"
 
Default Virtualization supporting 1000Mbps nics?

>I notice that any VMs running under it only have access to Realtek RTL8139C at 100 Mbps nics.
*
*
In kvm, you have the option to use e1000 or the pv drivers. You can probably specify another nic in xen, but you'll have to research which it supports.
*
Just make sure you retain the mac address, or the OS will see it as a new nic….
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Old 02-16-2011, 01:41 AM
Nico Kadel-Garcia
 
Default Virtualization supporting 1000Mbps nics?

On Mon, Feb 14, 2011 at 2:34 PM, Smithies, Russell
<Russell.Smithies@agresearch.co.nz> 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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Old 02-16-2011, 01:50 AM
"Smithies, Russell"
 
Default Virtualization supporting 1000Mbps nics?

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@centos.org [mailto:centos-bounces@centos.org] On
> Behalf Of Nico Kadel-Garcia
> Sent: Wednesday, 16 February 2011 3:42 p.m.
> To: CentOS mailing list
> Subject: Re: [CentOS] Virtualization supporting 1000Mbps nics?
>
> On Mon, Feb 14, 2011 at 2:34 PM, Smithies, Russell
> <Russell.Smithies@agresearch.co.nz> 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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> CentOS mailing list
> CentOS@centos.org
> http://lists.centos.org/mailman/listinfo/centos
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