Reviewed: https://review.openstack.org/548976 Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=4c8b97eca32c9c2beadf95fef14ed5b7d8981c5a Submitter: Zuul Branch: master
commit 4c8b97eca32c9c2beadf95fef14ed5b7d8981c5a Author: Brian Haley <[email protected]> Date: Thu Mar 1 15:42:59 2018 +0000 Do not start conntrack worker thread from __init__ Instead, start it when the first entry is being added to the queue. Also, log any exceptions just in case get() throws something so we can do further debugging. Changed class from Queue to LightQueue was done after going through the eventlet.queue code looking at usage, since it's a little smaller and should be faster. Change-Id: Ie84be88382f327ebe312bf17ec2dc5c80a8de35f Closes-bug: 1750777 ** Changed in: neutron Status: In Progress => Fix Released -- 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 neutron: Fix Released 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.spaw_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/neutron/+bug/1750777/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : [email protected] Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp
