openstack team mailing list archive

[Dan Wendlandt <dan@xxxxxxxxxx>]

Hi Emilien,

I know of customers using virtio with Quantum, but I think they may have
modified the template directly, as you mention below.

This code in nova changed quite a bit from Essex -> Folsom.  Looking at
nova/virt/libvirt/vif.py, I noticed that whoever added the
libvirt_use_virtio_for_bridges flag did not add it to the
LibvirtOpenVswitchDriver class.  Based on the XML you show below, my guess
would be that if you add the following lines prior to the return statement
of the plug() method of that class, you would get the right XML:

if FLAGS.libvirt_use_virtio_for_bridges:
      conf.model = "virtio"

That said, I haven't tested it.

Can you file a bug on this in nova?  Thanks,

Dan


On Tue, Aug 7, 2012 at 2:57 PM, Emilien Macchi
<emilien.macchi@xxxxxxxxxxxx>wrote:

> Hi Stackers,
>
>
> I'm talking with Sebastien Han<http://www.sebastien-han.fr/blog/2012/07/19/make-the-network-of-your-vms-fly-with-virtio-driver>about VirtIO Driver for network interfaces.
>
> We have two setup :
>
> 1) Ubuntu 12.04 / Essex / KVM
>    network_manager=*nova.network*.manager.*VlanManager*
>    libvirt_use_virtio_for_bridges=true
>
> 2) Ubuntu 12.04 / Essex / KVM
>    network_manager=nova.network.quantum.manager.QuantumManager
>    linuxnet_interface_driver=nova.network.linux_net.LinuxOVSInterfaceDriver
>    libvirt_use_virtio_for_bridges=true
>
> What we have seen :
>
> - VMs booting from first setup have VirtIO driver for networking (Gigabit
> ready). Here is the libvirt.xml for network part :
>
> <interface type='bridge'>
> (...)
>             <model type='virtio'/>
> (...)
> </interface>
>
> - VMs booting from second setup (with Quantum) don't use VirtIO driver (No
> gigabit). Here is the libvirt.xml for network part :
>
> <interface type='ethernet'>
>             <target dev='tapxxxxx' />
>             <mac address='xxxx' />
>             <script path='' />
>  </interface>
>
> The only one way I found to use VirtIO driver with Quantum to modify
> /usr/share/pyshared/nova/virt/libvirt.xml.template file and add :
>
> <model type='virtio'/>
> (after line 125)
>
> So you must have something like this :
> <interface type='ethernet'>
> <target dev='${nic.name}' />
> <mac address='${nic.mac_address}' />
> <script path='${nic.script}' />
> <model type='virtio'/>
> </interface>
>
> And restart LibVirt service :
> service libvirt-bin restart
>
>
> What do you think about that ? Should we modify the template to get
> Gigabit capacity or is there something wrong in my configuration ?
>
>
> Best regards
>
> --
> Emilien Macchi
> *System Engineer*
> *www.stackops.com
>
> | *emilien.macchi@xxxxxxxxxxxx**  *|* skype:emilien.macchi*
> * <http://www.stackops.com>
> *
>
> *
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-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~
Dan Wendlandt
Nicira, Inc: www.nicira.com
twitter: danwendlandt
~~~~~~~~~~~~~~~~~~~~~~~~~~~