Hi all,
Tried it on oVirt 3.2 as well; on the oVirtnode
(ovirt-node-iso-2.6.1-20120228.fc18):
[root@bigvirt bridge]# cat
/sys/class/net/ovirtmgmt/bridge/multicast_snooping
1
omping 192.168.1.212 192.168.1.211 -c500 ## will give heavy packet loss:
192.168.1.212 : unicast, xmt/rcv/%loss = 500/500/0%,
min/avg/max/std-dev = 0.381/0.633/0.891/0.074
192.168.1.212 : multicast, xmt/rcv/%loss = 500/266/46%,
min/avg/max/std-dev = 0.427/0.641/0.997/0.065
Disabling multicast snooping:
[root@bigvirt bridge]# echo 0 >
/sys/class/net/ovirtmgmt/bridge/multicast_snooping
[root@bigvirt bridge]# cat
/sys/class/net/ovirtmgmt/bridge/multicast_snooping
0
omping 192.168.1.212 192.168.1.211 -c500 ## packet loss 0%
192.168.1.212 : unicast, xmt/rcv/%loss = 500/500/0%,
min/avg/max/std-dev = 0.353/0.623/0.944/0.075
192.168.1.212 : multicast, xmt/rcv/%loss = 500/500/0%,
min/avg/max/std-dev = 0.356/0.642/0.964/0.078
I tried it a couple of times, switching multicast snooping on and off;
same result.
I would consider this to be a bug? Bugzilla report wanted?
Winfried
Op 21-03-13 12:17, Antoni Segura Puimedon schreef:
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" <w...@dds.nl>
To: users@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
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