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Hi Saverio,

Thanks for the info. The parameter is missing completely:

    <interface type='bridge'>
      <mac address='fa:16:3e:19:3d:b8'/>
      <source bridge='qbrba20d1ab-30'/>
      <target dev='tapba20d1ab-30'/>
      <model type='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03'
function='0x0'/>
    </interface>

I've came across the blueprint for adding the image property
hw_vif_multiqueue_enabled.
Do you know if this feature is available in Mitaka?

John Petrini

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On Fri, Jul 28, 2017 at 3:59 AM, Saverio Proto <zioproto at gmail.com> wrote:

> Hello John,
>
> a common problem is packets being dropped when they pass from the
> hypervisor to the instance. There is bottleneck there.
>
> check the 'virsh dumpxml' of one of the instances that is dropping
> packets. Check for the interface section, should look like:
>
>     <interface type='bridge'>
>       <mac address='xx:xx:xx:xx:xx:xx'/>
>       <source bridge='qbr5b3fc033-e2'/>
>       <target dev='tap5b3fc033-e2'/>
>       <model type='virtio'/>
>       <driver name='vhost' queues='4'/>
>       <alias name='net0'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x03'
> function='0x0'/>
>     </interface>
>
> how many queues you have ??? Usually if you have only 1 or if the
> parameter is missing completely is not good.
>
> in Mitaka nova should use 1 queue for every instance CPU core you
> have. It is worth to check if this is set correctly in your setup.
>
> Cheers,
>
> Saverio
>
>
>
> 2017-07-27 17:49 GMT+02:00 John Petrini <jpetrini at coredial.com>:
> > Hi List,
> >
> > We are running Mitaka with VLAN provider networking. We've recently
> > encountered a problem where the UDP receive queue on instances is
> filling up
> > and we begin dropping packets. Moving instances out of OpenStack onto
> bare
> > metal resolves the issue completely.
> >
> > These instances are running asterisk which should be pulling these
> packets
> > off the queue but it appears to be falling behind no matter the
> resources we
> > give it.
> >
> > We can't seem to pin down a reason why we would see this behavior in KVM
> but
> > not on metal. I'm hoping someone on the list might have some insight or
> > ideas.
> >
> > Thank You,
> >
> > John
> >
> > _______________________________________________
> > OpenStack-operators mailing list
> > OpenStack-operators at lists.openstack.org
> > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators
> >
>
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