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 <enikano...@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) <li...@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 <jpetr...@coredial.com> 写道： >> > >> > We already tune these values in the VM. Would you suggest tuning them on >> > the compute nodes as well? >> _______________________________________________ >> Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack >> Post to : openstack@lists.openstack.org >> Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > > > _______________________________________________ > Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > Post to : openstack@lists.openstack.org > Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack _______________________________________________ Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack Post to : openstack@lists.openstack.org Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
