** Also affects: neutron (Ubuntu) Importance: Undecided Status: New
** Changed in: neutron (Ubuntu) Status: New => Triaged ** Changed in: neutron (Ubuntu) Importance: Undecided => High ** Also affects: neutron (Ubuntu Bionic) Importance: Undecided Status: New ** Also affects: neutron (Ubuntu Cosmic) Importance: High Status: Triaged ** Also affects: cloud-archive Importance: Undecided Status: New ** Also affects: cloud-archive/queens Importance: Undecided Status: New ** Changed in: cloud-archive/queens Status: New => Triaged ** Changed in: neutron (Ubuntu Bionic) Importance: Undecided => High ** Changed in: neutron (Ubuntu Bionic) Status: New => Triaged ** Changed in: cloud-archive/queens Importance: Undecided => High -- You received this bug notification because you are a member of Yahoo! Engineering Team, which is subscribed to neutron. https://bugs.launchpad.net/bugs/1750777 Title: openvswitch agent eating CPU, time spent in ip_conntrack.py Status in Ubuntu Cloud Archive: Triaged Status in Ubuntu Cloud Archive queens series: Triaged Status in neutron: Fix Released Status in neutron package in Ubuntu: Triaged Status in neutron source package in Bionic: Triaged Status in neutron source package in Cosmic: Triaged Bug description: We just ran into a case where the openvswitch agent (local dev destack, current master branch) eats 100% of CPU time. Pyflame profiling show the time being largely spent in neutron.agent.linux.ip_conntrack, line 95. https://github.com/openstack/neutron/blob/master/neutron/agent/linux/ip_conntrack.py#L95 The code around this line is: while True: pool.spawn_n(self._process_queue) The documentation of eventlet.spawn_n says: "The same as spawn(), but it’s not possible to know how the function terminated (i.e. no return value or exceptions). This makes execution faster. See spawn_n for more details." I suspect that GreenPool.spawn_n may behave similarly. It seems plausible that spawn_n is returning very quickly because of some error, and then all time is quickly spent in a short circuited while loop. To manage notifications about this bug go to: https://bugs.launchpad.net/cloud-archive/+bug/1750777/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : yahoo-eng-team@lists.launchpad.net Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp