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[Doug Hellmann <doug@xxxxxxxxxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1502930

Title:
  ipset grabs semaphore excessively

Status in neutron:
  Fix Released

Bug description:
  ipset grabs a semaphore on the set_members operation so it ensures
  only one caller is modifying the sets. However, set_members is called
  many times on a single security group update when an agent is hosting
  ports that are all members of the same security groups. It returns
  early for all but one of the calls, but not without getting the
  semaphore first and spamming the logs. This is an external lock so
  it's expensive as well.

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