[Bug 2165004] Re: Enable address prefix tracking for IPv6 by default

[Frode Nordahl]

** Description changed:

  Not having prefix tracking for IPv6 appears to cause number of active
  data path flows to scale with number of active connections.
  
  When combined with hardware offload this churn may be problematic as
  depending on data path type and other factors updating the hardware
  takes time which in turn can lead to increased dump duration and
- flow_limit collapse [1].
+ flow_limit collapse [2].
  
- Open vSwitch enabled this by default [0] at 3.5, let's figure out how to
- best make this available for in use versions such as 2.17.x and 3.3.x.
+ Open vSwitch enabled this by default [0][1] at 3.5, let's figure out how
+ to best make this available for in use versions such as 2.17.x and
+ 3.3.x.
  
  0: https://github.com/openvswitch/ovs/commit/2af7cef26487d4f8d7e3237af92ca75e6798d2af
- 1: https://gist.github.com/matperin/d6f314fc2fbe584ad076b050f4230d99
+ 1: https://github.com/openvswitch/ovs/commit/4394f7281862935af06642c8c0d8be8d518d7e81
+ 2: https://gist.github.com/matperin/d6f314fc2fbe584ad076b050f4230d99

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https://bugs.launchpad.net/bugs/2165004

Title:
  Enable address prefix tracking for IPv6 by default

Status in openvswitch package in Ubuntu:
  New

Bug description:
  Not having prefix tracking for IPv6 appears to cause number of active
  data path flows to scale with number of active connections.

  When combined with hardware offload this churn may be problematic as
  depending on data path type and other factors updating the hardware
  takes time which in turn can lead to increased dump duration and
  flow_limit collapse [2].

  Open vSwitch enabled this by default [0][1] at 3.5, let's figure out
  how to best make this available for in use versions such as 2.17.x and
  3.3.x.

  0: https://github.com/openvswitch/ovs/commit/2af7cef26487d4f8d7e3237af92ca75e6798d2af
  1: https://github.com/openvswitch/ovs/commit/4394f7281862935af06642c8c0d8be8d518d7e81
  2: https://gist.github.com/matperin/d6f314fc2fbe584ad076b050f4230d99

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