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[Alan Pevec <1177973@xxxxxxxxxxxxxxxxxx>]

** Also affects: neutron/havana
   Importance: Undecided
       Status: New

** Changed in: neutron/havana
     Assignee: (unassigned) => Terry Wilson (otherwiseguy)

** Tags removed: havana-backport-potential

** Changed in: neutron/havana
   Importance: Undecided => Medium

** Changed in: neutron/havana
       Status: New => In Progress

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https://bugs.launchpad.net/bugs/1177973

Title:
  OVS L2 agent polling is too cpu intensive

Status in OpenStack Neutron (virtual network service):
  Fix Released
Status in neutron havana series:
  In Progress

Bug description:
  On a Devstack-deployed, single-node install, the ovs l2 agent is using
  an order of magnitude more cpu than any other service.  On a nested-
  virt VM running on a 2.5GHz host, with no VM's provisioned:

   - WIth L2 agent running, 10-100% cpu usage recorded, averaging ~40%
   - With L2 agent stopped, 0-10% cpu usage recorded

  Casual inspection with something like top or htop will show the
  excessive cpu usage, but won't give a good indication of the culprit.
  Enabling the CUTIME and CSTIME stats is necessary to highlight the
  problem, as all the time taken by the agent is in subprocess-invoked
  polling whose execution time is not directly included in the parent's
  cpu usage.

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