[Bug 1648206] Re: sriov agent report_state is slow

[Ihar Hrachyshka]

** Tags added: neutron-proactive-backport-potential

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https://bugs.launchpad.net/bugs/1648206

Title:
  sriov agent report_state is slow

Status in Ubuntu Cloud Archive:
  Confirmed
Status in neutron:
  Fix Released

Bug description:
  On a system with lots of VFs and PFs we get these logs:

  WARNING oslo.service.loopingcall [-] Function 'neutron.plugins.ml2.drivers.mech_sriov.agent.sriov_nic_agent.SriovNicSwitchAgent._report_state' run outlasted interval by 29.67 sec
  WARNING oslo.service.loopingcall [-] Function 'neutron.plugins.ml2.drivers.mech_sriov.agent.sriov_nic_agent.SriovNicSwitchAgent._report_state' run outlasted interval by 45.43 sec
  WARNING oslo.service.loopingcall [-] Function 'neutron.plugins.ml2.drivers.mech_sriov.agent.sriov_nic_agent.SriovNicSwitchAgent._report_state' run outlasted interval by 47.64 sec
  WARNING oslo.service.loopingcall [-] Function 'neutron.plugins.ml2.drivers.mech_sriov.agent.sriov_nic_agent.SriovNicSwitchAgent._report_state' run outlasted interval by 23.89 sec
  WARNING oslo.service.loopingcall [-] Function 'neutron.plugins.ml2.drivers.mech_sriov.agent.sriov_nic_agent.SriovNicSwitchAgent._report_state' run outlasted interval by 30.20 sec

  
  Depending on the agent_down_time configuration, this can cause the Neutron server to think the agent has died.

  
  This appears to be caused by blocking on the eswitch manager every time to get a device count to include in the state report.

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