[Users] ovirt 3.2 - high multicast packet loss

Thu Mar 21 07:17:48 EDT 2013

Michael Tsirkin (Thanks!) proposes to try the following:

try disabling multicast snooping in the bridge

Could you give it a shot?

----- Original Message -----
> From: "Winfried de Heiden" <wdh at dds.nl>
> To: users at ovirt.org
> Sent: Thursday, March 21, 2013 10:14:04 AM
> Subject: Re: [Users] ovirt 3.2 - high multicast packet loss
> 
> So far no reactie about the multicast packet loss......
> 
> I bumbed into this bug:
> https://bugzilla.redhat.com/show_bug.cgi?id=880035
> 
> This looks the same as the problems I am suffering using oVirt 3.2:
> heavy multicast packet loss after some time.
> 
> This the bug affect oVirt 3.2 ovirt-node (2.6.1-20120228.fc18)?
> Can anyone reproduce the problem (omping between 3 virtual nodes)?
> 
> Winfried
> 
> 
> Op 18-03-13 16:58, Winfried de Heiden schreef:
> > Same for Debian 6 (x86_64); 47% packet loss:
> >
> > ssmping -c 500 192.168.1.234
> >
> > --- 192.168.1.234 statistics ---
> > 500 packets transmitted, time 500001 ms
> > unicast:
> >    500 packets received, 0% packet loss
> >    rtt min/avg/max/std-dev = 0.352/0.675/0.863/0.072 ms
> > multicast:
> >    265 packets received, 47% packet loss since first mc packet (seq
> >    1)
> > recvd
> >    rtt min/avg/max/std-dev = 0.414/0.703/0.885/0.086 ms
> >
> >
> > Winfried
> >
> > Hi all,
> >>
> >> Playing around with Red Hat Clustering, it turns out I have a
> >> hughe
> >> multicast packet loss: (Centos 6.4 - x86_64  with all updates)
> >>
> >> omping 192.168.1.211 192.168.1.212 -c500 (node1)
> >> omping 192.168.1.212 192.168.1.211 -c500(node2)
> >>
> >> will give almost 50% loss!
> >>
> >> 192.168.1.211 :   unicast, xmt/rcv/%loss = 500/500/0%,
> >> min/avg/max/std-dev = 0.330/0.610/0.789/0.064
> >> 192.168.1.211 : multicast, xmt/rcv/%loss = 500/268/46%,
> >> min/avg/max/std-dev = 0.416/0.635/0.921/0.066
> >>
> >> 192.168.1.212 :   unicast, xmt/rcv/%loss = 500/500/0%,
> >> min/avg/max/std-dev = 0.388/0.653/0.863/0.069
> >> 192.168.1.212 : multicast, xmt/rcv/%loss = 500/263/47%,
> >> min/avg/max/std-dev = 0.396/0.670/1.080/0.074
> >>
> >> OK, I am using simple hardware, but this hardware is virtually
> >> doing
> >> nothing...
> >>
> >> As mentioned on
> >> https://access.redhat.com/knowledge/sites/default/files/attachments/rhel_cluster_vm_multicast.pdf,
> >> I set the txqueelen to 500, same result?
> >>
> >> I 'm still guessing whether this is an oVirt, virtio or Red
> >> Hat/Centos issue? Problems only happend after some time; that is
> >> 200
> >> mo-pings shows everything is fine.
> >>
> >> Anyone?
> >>
> >> Winfried
> >>
> >>
> >> _______________________________________________
> >> Users mailing list
> >> Users at ovirt.org
> >> http://lists.ovirt.org/mailman/listinfo/users
> >
> > _______________________________________________
> > Users mailing list
> > Users at ovirt.org
> > http://lists.ovirt.org/mailman/listinfo/users
> 
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