[Users] ovirt 3.2 - high multicast packet loss

[Winfried de Heiden]

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
>
>
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