[Users] ovirt 3.2 - high multicast packet loss

[Winfried de Heiden]

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
>>
>>
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>
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