> >
> > I use ethernet vif for VM (libvirt 1.1.0 qemu 1.5.1). xml as such
> >
> > <interface type='ethernet'>
> > <script path='' />
> > <target dev='tap_mq'/>
> > <mac address='52:54:00:19:9e:4e'/>
> > <model type='virtio' />
> > <driver name='vhost' queues='2'/>
> > </interface>
> >
> > tap_mq is a tap device with multi_queue property which was created
> on host by ip command, such as follows
> > #ip tuntap add tap_mq mode tap multi_queue
> >
> > I want to use multiple queue feature for this vif so I set queues='2' in
> xml.
> >
> > When start VM , an error occurs
> > "error: unsupported configuration: Multiqueue network is not
> supported for: ethernet".
> > This error is reported from function qemuBuildInterfaceCommandLine
> >
> > /* Currently nothing besides TAP devices supports multiqueue. */
> > if (net->driver.virtio.queues > 0 &&
> > !(actualType == VIR_DOMAIN_NET_TYPE_NETWORK ||
> > actualType == VIR_DOMAIN_NET_TYPE_BRIDGE)) {
> > virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
> > _("Multiqueue network is not supported
> for: %s"),
> > virDomainNetTypeToString(actualType));
> > return -1;
> > }
> >
> > The comment specifies that only TAP device supports multiqueue. But
> VIR_DOMAIN_NET_TYPE_ETHERNET is also TAP device I think.
>
> Even though the device is TAP device indeed, it's not from the libvirt
> POV. Libvirt doesn't examine the target dev to see if it is TAP,
> physical NIC, sit, ... whatever.
Yep, but I think libvirt should provide this ability which process multi_queue of ethernet type.
And the result is guaranteed by the emulator, such as Qemu.
>
> As always, patches are welcome :)
>
> Michal
Best regards,
-Gonglei
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