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[Armando Migliaccio <1502297@xxxxxxxxxxxxxxxxxx>]

This can probably be closed, but Kevin should chime in on any minor
performance improvement that may be left.

** Changed in: neutron
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1502297

Title:
  [RFE] Improve SG performance as VMs/containers scale on compute node

Status in neutron:
  Fix Released

Bug description:
  Please refer to the comments in the following bug:

  https://bugs.launchpad.net/neutron/+bug/1492456

  In which it was suggested to handle improving SG programming
  performance as a RFE bug.

  To Summarize the problem, when there are about 160 VMs, the neutron-
  ovs-agent takes more than 2 seconds per VM  to program the iptables
  rules mainly because of the inefficiency in the iptables programming
  code.

  #VMs = 0, provision 10 new VMs on compute node
  cumulative time in _modify_rules : Before 0.34 After: 0.20

  #VMs = 10, provision 10 new VMs on compute node
  cumulative time in _modify_rules : Before 1.68 After: 0.94

  #VMs = 20, provision 10 new VMs on compute node
  cumulative time in _modify_rules : Before 4.27 After: 2.12

  #VMs = 40, provision 10 new VMs on compute node
  cumulative time in _modify_rules : Before 11.8 After: 6.44

  #VMs = 80, provision 10 new VMs on compute node
  cumulative time in _modify_rules : Before 20.2 After: 13.6

  #VMs = 160, provision 10 new VMs on compute node
  cumulative time in _modify_rules : Before 50 After: 23.2   <<<<< more than 2 seconds per VM !!!

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