<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">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?<div class=""><br class=""></div><div class="">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.</div><div class=""><br class=""><div class="">
<div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;">Jean-Philippe Méthot</div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;">Openstack system administrator</div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;">Administrateur système Openstack</div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;">PlanetHoster inc.</div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;"><br class=""></div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class=""><br class=""></div><br class="Apple-interchange-newline">
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<div><br class=""><blockquote type="cite" class=""><div class="">Le 26 sept. 2018 à 11:48, Simon Leinen <<a href="mailto:simon.leinen@switch.ch" class="">simon.leinen@switch.ch</a>> a écrit :</div><br class="Apple-interchange-newline"><div class=""><div class="">Jean-Philippe Méthot writes:<br class=""><blockquote type="cite" class="">This particular message makes it sound as if openvswitch is getting overloaded.<br class="">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<br class=""></blockquote><br class="">We get these as well :-(<br class=""><br class=""><blockquote type="cite" class="">A lot of those keep appear, and openvswitch always reconnects almost<br class="">instantly though. I’ve done some research about that particular<br class="">message, but it didn’t give me anything I can use to fix it.<br class=""></blockquote><br class="">Would be interested in solutions as well. But I'm sceptical whether<br class="">kernel settings can help here, because the timeout/slowness seems to be<br class="">located in the user-space/control-plane parts of Open vSwitch,<br class="">i.e. OVSDB.<br class="">-- <br class="">Simon.<br class=""><br class=""><blockquote type="cite" class="">Jean-Philippe Méthot<br class="">Openstack system administrator<br class="">Administrateur système Openstack<br class="">PlanetHoster inc.<br class=""></blockquote><br class=""><blockquote type="cite" class=""> Le 25 sept. 2018 à 19:37, Erik McCormick <<a href="mailto:emccormick@cirrusseven.com" class="">emccormick@cirrusseven.com</a>> a écrit :<br class=""></blockquote><br class=""><blockquote type="cite" class=""> 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<br class=""> noticed. Anything in dmesg, journal or neutron logs of interest? <br class=""></blockquote><br class=""><blockquote type="cite" class=""> On Tue, Sep 25, 2018, 7:27 PM Jean-Philippe Méthot <<a href="mailto:jp.methot@planethoster.info" class="">jp.methot@planethoster.info</a>> wrote:<br class=""></blockquote><br class=""><blockquote type="cite" class=""> Hi,<br class=""></blockquote><br class=""><blockquote type="cite" class=""> 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<br class=""> 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<br class=""> attack, or whatever it was.<br class=""></blockquote><br class=""><blockquote type="cite" class=""> Best regards,<br class=""></blockquote><br class=""><blockquote type="cite" class=""> Jean-Philippe Méthot<br class=""> Openstack system administrator<br class=""> Administrateur système Openstack<br class=""> PlanetHoster inc.<br class=""></blockquote><br class=""><blockquote type="cite" class=""> _______________________________________________<br class=""> OpenStack-operators mailing list<br class=""> <a href="mailto:OpenStack-operators@lists.openstack.org" class="">OpenStack-operators@lists.openstack.org</a><br class=""> <a href="http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators" class="">http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators</a><br class=""></blockquote><br class=""><blockquote type="cite" class="">_______________________________________________<br class="">OpenStack-operators mailing list<br class=""><a href="mailto:OpenStack-operators@lists.openstack.org" class="">OpenStack-operators@lists.openstack.org</a><br class="">http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators<br class=""></blockquote><br class=""></div></div></blockquote></div><br class=""></div></body></html>