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[Sreekumar S <sreesiv@xxxxxxxxx>]

Public bug reported:

When bridge ports are missing for br-int and br-tun and agent starts up, it checks for patch ports int-br-ex and phy-br-ex before adding those. But here the function used to check their existence is get_port_ofport() which retries it because of the @_ofport_retry decoration.
This causes the restart to become unnecessarily slow because of the retries. get_port_ofport() should be used only when the port is requested to be created, and the code waits for the ports to be created before proceeding further. We could've just checked for the port's existence with a call to port_exists() on the bridge.

** Affects: neutron
     Importance: Undecided
         Status: New


** Tags: performance

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https://bugs.launchpad.net/bugs/1579769

Title:
  neutron agent restart slow when bridge ports are missing

Status in neutron:
  New

Bug description:
  When bridge ports are missing for br-int and br-tun and agent starts up, it checks for patch ports int-br-ex and phy-br-ex before adding those. But here the function used to check their existence is get_port_ofport() which retries it because of the @_ofport_retry decoration.
  This causes the restart to become unnecessarily slow because of the retries. get_port_ofport() should be used only when the port is requested to be created, and the code waits for the ports to be created before proceeding further. We could've just checked for the port's existence with a call to port_exists() on the bridge.

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