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[Brian Haley <1670625@xxxxxxxxxxxxxxxxxx>]

** Changed in: neutron
       Status: Confirmed => Won't Fix

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https://bugs.launchpad.net/bugs/1670625

Title:
  populate fdb entries before spawning vm

Status in neutron:
  Won't Fix

Bug description:
  before spawning vm, neutron l2 agent has to wire up device on compute.
  This is controlled by provisioning_block in neutron. However L2 agent
  on compute takes much time to sync lots of fdb info during wire up
  device and which causes VM takes long time to spawn and active. The
  fdb synchronization could be done when spawning vm to improve the
  performance of booting vm. This also delays next loop of daemon_loop
  to get another new taps processed.

  Steps to re-produce the problem:

  L2 of linuxbridge and dedicated compute nodes

  1) nova boot  --image  ubuntu-guest-image-14.04  --flavor m1.medium
  --nic net-name=internal --security-groups unlocked --min-count 50
  --max-count 50 free_deletable

  2)observe numerous log as below in neutron-linuxbridge-agent.log.

  2017-03-07 05:01:43.220 25336 DEBUG neutron.agent.linux.utils
  [req-534e9f59-0a66-4071-8c40-977f87a6be49 - - - - -] Running command:
  ['sudo', '/bin/neutron-rootwrap', '/etc/neutron/rootwrap.conf',
  'bridge', 'fdb', 'append', '00:00:00:00:00:00', 'dev', 'vxlan-1',
  'dst', '10.160.152.141'] create_process /usr/lib/python2.7/site-
  packages/neutron/agent/linux/utils.py:89

  3)eventually, it takes lots of time to process new tap (6.2 seconds)
  in neutron-linuxbridge-agent.log

  2017-03-07 05:01:44.654 25336 DEBUG
  neutron.plugins.ml2.drivers.agent._common_agent
  [req-835dd509-27b0-42e3-903d-32577187d288 - - - - -] Loop iteration
  exceeded interval (2 vs. 6.2001709938)! daemon_loop
  /usr/lib/python2.7/site-
  packages/neutron/plugins/ml2/drivers/agent/_common_agent.py:466

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