Yes, I notice that every time that message appears, at least a few packets get dropped and some of our instances pop up in nagios, even though they are reachable 1 or 2 seconds after. It’s really causing us some issues as we can’t ensure proper network quality for our customers. Have you noticed the same?
By that point I think it may be best to contact openvswitch directly since it seems to be an issue with their component. I am about to do that and hope I don’t get sent back to the openstack mailing list. I would really like to know what this probe is and why it disconnects constantly under load. Jean-Philippe Méthot Openstack system administrator Administrateur système Openstack PlanetHoster inc. > Le 26 sept. 2018 à 11:48, Simon Leinen <simon.lei...@switch.ch> a écrit : > > Jean-Philippe Méthot writes: >> This particular message makes it sound as if openvswitch is getting >> overloaded. >> Sep 23 03:54:08 network1 ovsdb-server: >> ovs|01253|reconnect|ERR|tcp:127.0.0.1:50814: no response to inactivity probe >> after 5.01 seconds, disconnecting > > We get these as well :-( > >> A lot of those keep appear, and openvswitch always reconnects almost >> instantly though. I’ve done some research about that particular >> message, but it didn’t give me anything I can use to fix it. > > Would be interested in solutions as well. But I'm sceptical whether > kernel settings can help here, because the timeout/slowness seems to be > located in the user-space/control-plane parts of Open vSwitch, > i.e. OVSDB. > -- > Simon. > >> Jean-Philippe Méthot >> Openstack system administrator >> Administrateur système Openstack >> PlanetHoster inc. > >> Le 25 sept. 2018 à 19:37, Erik McCormick <emccorm...@cirrusseven.com> a >> écrit : > >> Ate you getting any particular log messages that lead you to conclude your >> issue lies with OVS? I've hit lots of kernel limits under those conditions >> before OVS itself ever >> noticed. Anything in dmesg, journal or neutron logs of interest? > >> On Tue, Sep 25, 2018, 7:27 PM Jean-Philippe Méthot >> <jp.met...@planethoster.info> wrote: > >> Hi, > >> Are there some recommendations regarding kernel settings configuration for >> openvswitch? We’ve just been hit by what we believe may be an attack of some >> kind we >> have never seen before and we’re wondering if there’s a way to optimize our >> network nodes kernel for openvswitch operation and thus minimize the impact >> of such an >> attack, or whatever it was. > >> Best regards, > >> Jean-Philippe Méthot >> Openstack system administrator >> Administrateur système Openstack >> PlanetHoster inc. > >> _______________________________________________ >> OpenStack-operators mailing list >> OpenStack-operators@lists.openstack.org >> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators > >> _______________________________________________ >> OpenStack-operators mailing list >> OpenStack-operators@lists.openstack.org >> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators >
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