Hi,
On 30/01/13 14:44, Markus Schuster wrote:
Hi,
looks like I'm currently in SLB bonding bug hunting mood :) - I think I found
an additional bug / strange behaviour with balance-slb bonding: Two VMs
suffered from short term (a few minutes) connectivity issues every now and
then, so I started digging further into the issue. First thing I noticed is
the MAC of the VM jumping between ports on the uplink switches like mad - I
had to think of my other bug report [1] - but this time I saw no broad- or
multicast frames but normal unicast frames sent out on both member ports of
the bond for a few minutes every now and then.
Long story short: XCP 1.6 configures SLB bonds to rebalance their traffic
every 30 minutes. And it looks like Open vSwitch sometimes fails in migrating
certain flows from one interface to the other. That causes some traffic to be
sent via the "old" interface and some via the "new" interface.
This is a known problem in OVS 1.4.2 (the version released with
XenServer 6.1): the flows are not properly tagged during rebalancing in
userspace, and therefore the change doesn't propagate to the kernel flow
tables. This was fixed by this backported patch in 1.4.3:
http://openvswitch.org/cgi-bin/gitweb.cgi?p=openvswitch;a=commitdiff;h=865f22b3b3cb953c48ed30dd21f16ea3dd53f04c
And the algorithm was also quite ineffective, it was fixed in 1.4.4:
http://openvswitch.org/cgi-bin/gitweb.cgi?p=openvswitch;a=commitdiff;h=ba60b421cc159b7e53f7e9a890aa130a35801083
There isn't any XS 6.1 public hotfix released for this.
Regards,
Zoltan Kiss
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