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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: neutron
       Status: Fix Committed => Fix Released

** Changed in: neutron
    Milestone: None => liberty-rc1

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https://bugs.launchpad.net/bugs/1492111

Title:
  Support to set an optional csum attribute on ovs tunnels

Status in neutron:
  Fix Released

Bug description:
  During some of the performance tests, it was observed that on few of
  the 10G nics (intel br kx4 dual-port, intel 82599es), enabling the
  csum option boosted the vxlan/geneve performance by triggering GRO on
  the receiver.

  Kindly refer to the link for more details on the role of csum in vxlan performance.
  http://openvswitch.org/pipermail/dev/2015-August/059335.html

  This defect is created to add an additional option (tunnel_csum) in
  the ovs agent. This option will be passed to the ovs agent, which in
  turn will set the "option:csum" during the creation of GRE, VXLAN, and
  GENEVE tunnels

  The provision for this option is available in OVS 2.4 for
  vxlan/geneve.

  The changes for this option will be on similar lines of
  "dont_fragment" flag.

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