Open Stack

I know this thread is old but still wanted to post my finding which
may help other folks to understand issue.

I am dealing with same issue in my openstack network, we are media
company and dealing with lots of VoIP applications where we need to
handle high stream of udp packets,  Virtio-net isn't meant to handl
high PPS rate, i ran couple of test and found no matter what txqueue
or multiqueue you set it will start dropping packet after 50kpps, I
have tried numa too but result is negative.

Finally i have decided to move and and try SR-IOV and now i am very
very happy, SR-IOV reduce my VM guest CPU load 50% and now my NIC can
handle 200kpps without dropping any packet.

I would say use "iptraf-ng" utility to find out packet rate and see if
its above ~40kpps.
On Fri, Jul 28, 2017 at 8:39 PM Eugene Nikanorov
<enikanorov at mirantis.com> wrote:
>
> John,
>
> multiqueue support will require qemu 2.5+
> I wonder why do you need this feature. It only will help in case of a really huge incoming pps or bandwidth.
> I'm not sure udp packet loss can be solved with this, but of course better try.
>
> my 2c.
>
> Thanks,
> Eugene.
>
> On Fri, Jul 28, 2017 at 5:00 PM, Liping Mao (limao) <limao at cisco.com> wrote:
>>
>> > We already tune these values in the VM. Would you suggest tuning them on the compute nodes as well?
>> No need on compute nodes.(AFAIK)
>>
>>
>> How much pps your vm need to handle?
>> You can monitor CPU usage ,especially si to see where may drop. If you see vhost almost reach to 100% CPU ,multi queue may help in some case.
>>
>> Thanks.
>>
>> Regards,
>> Liping Mao
>>
>> > 在 2017年7月28日，22:45，John Petrini <jpetrini at coredial.com> 写道：
>> >
>> > We already tune these values in the VM. Would you suggest tuning them on the compute nodes as well?
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