On Mon, Oct 16, 2017 at 10:58:43AM -0700, Ben Pfaff wrote: > On Mon, Oct 16, 2017 at 02:50:48PM +0530, Numan Siddique wrote: > > On Sat, Oct 14, 2017 at 2:56 AM, Ben Pfaff <[email protected]> wrote: > > > > > On Fri, Oct 13, 2017 at 12:06:56PM -0400, Russell Bryant wrote: > > > > On Fri, Oct 13, 2017 at 8:30 AM, Numan Siddique <[email protected]> > > > wrote: > > > > > On Fri, Oct 13, 2017 at 6:05 AM, Andy Zhou <[email protected]> wrote: > > > > > > > > > >> Hi, Numan, > > > > >> > > > > >> I am curious why default 5 seconds inactivity time does not work? Do > > > > >> you have more details? > > > > >> > > > > >> Does the glitch usually happen around the HA switch over? If this > > > > >> happens during normal operation, > > > > >> Then this is not HA specific issue, but an indication of some > > > > >> connectivity issues. > > > > >> > > > > > > > > > > Hi Andy. This happens in the openstack deployment and when the > > > > > neutron-server is busy handling lots of API requests. > > > > > Normally the deployment would be having 3 controller nodes and > > > > > neutron-server would be running in each node. On each controller > > > > > node, > > > > > neutron-server starts around 10 - 12 neutron workers (which are > > > separate > > > > > processes). Number of API workers is a configuration option and > > > normally > > > > > number of cores = no of neutron works if not configured. > > > > > > > > > > I have tested in both physical nodes deployment and virtual > > > deployment (3 > > > > > controllers running as vms in a node). Around 40 connections are > > > opened to > > > > > the OVN north ovsdb-server by all the neutron workers in the physical > > > > > deployment and around 15 connections are opened in the virtual > > > deployment. > > > > > When neutron-server is loaded with many API requests, I have noticed > > > that, > > > > > ovsdb-server drops the connections when it doesn't get the echo reply > > > every > > > > > 5 seconds. This leads to lot of reconnections to the ovsdb-server and > > > the > > > > > response from the neutron-server is very slow and bad. With this > > > patch it > > > > > seems to work fine. > > > > > > > > > > The issue is not because of any network issues but because of lots of > > > > > connections from the neutron-server workers to the ovsdb-server and > > > failure > > > > > by the idl clients to reply to the echo request every 5 seconds when > > > the > > > > > neutron-server is loaded. > > > > > > > > We have to disable the inactivity probe everywhere each time we have > > > > done performance testing so far. > > > > > > Really this seems that it's a bug (or inadequacy) in ovsdb-server. It's > > > pretty sad that ovsdb-server can't reply within 5 seconds > > > > > > It's actually the ovsdb python idl client which is not able to reply within > > 5 seconds for the > > echo request from ovsdb-server. > > Oh, I'm surprised that ovsdb-server is doing the echo-requests, I > thought that we generally did them from the client end.
One perfectly acceptable approach might be to simply disable echo-requests on the server side entirely and do them from the client. _______________________________________________ dev mailing list [email protected] https://mail.openvswitch.org/mailman/listinfo/ovs-dev
