Re: [Openstack-operators] [neutron] ML2/OVS dropping packets?

2017-06-21 Thread Kevin Benton
Can you do a tcpdump to see if the VM is sending any packets out that other interface with the source mac of the primary interface? We make use of the NORMAL action which does mac learning so it's possible something is slipping through that is causing OVS to get the wrong port association. The

Re: [Openstack-operators] [neutron] ML2/OVS dropping packets?

2017-06-21 Thread Jonathan Proulx
So this all gets more interesting the packets aren't lost they get routed (switched?) to the wrong interface... The VM has two interfaces on the same network. Not sure this makes sense and wes done because this was a straight physical to virtual migration. But seems like it should work so VM

Re: [Openstack-operators] [neutron] ML2/OVS dropping packets?

2017-06-21 Thread Stig Telfer
Hi Jon - From what I understand, while you might have gone to the trouble of configuring a lossless data centre ethernet, that guarantee of packet loss ends at the hypervisor. OVS (and other virtual switches) will drop packets rather than exert back pressure. I saw a useful paper from IBM

Re: [Openstack-operators] [neutron] ML2/OVS dropping packets?

2017-06-21 Thread Jonathan Proulx
On Wed, Jun 21, 2017 at 02:39:23AM -0700, Kevin Benton wrote: :Are there any events going on during these outages that would cause :reprogramming by the Neutron agent? (e.g. port updates) If not, it's likely :an OVS issue and you might want to cross-post to the ovs-discuss mailing :list. Guess

Re: [Openstack-operators] [neutron] ML2/OVS dropping packets?

2017-06-21 Thread Kevin Benton
Are there any events going on during these outages that would cause reprogramming by the Neutron agent? (e.g. port updates) If not, it's likely an OVS issue and you might want to cross-post to the ovs-discuss mailing list. Can you check the vswitch logs during the packet loss to see if there are

[Openstack-operators] [neutron] ML2/OVS dropping packets?

2017-06-20 Thread Jonathan Proulx
Hi All, I have a very busy VM (well one of my users does I don't have access but do have cooperative and copentent admin to interact with on th eother end). At peak times it *sometimes* misses packets. I've been didding in for a bit ant it looks like they get dropped in OVS land. The VM's main