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

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

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https://bugs.launchpad.net/bugs/1293083

Title:
  report_interval too frequent; Causing load on service, failing high
  CPU usage operations

Status in OpenStack Neutron (virtual network service):
  Fix Released

Bug description:
  report_interval is how often an agent sends out a heartbeat to the
  service. The Neutron service responds to these 'report_state' RPC
  messages by updating the agent's heartbeat DB record. The last
  heartbeat is then compared to the configured agent_down_time to
  determine if the agent is up or down. The agent's status is used when
  scheduling networks on DHCP and L3 agents.

  The defaults are 4 seconds for report_interval and 9 for
  agent_down_time.

  On a setup with 18 agents (15 layer 2, L3, DHCP, metadata) sitting on
  16 nodes, and a Neutron service sitting on a dedicated powerful
  machine, the service was idle with 20% CPU usage. Changing the
  report_interval to 28 seconds and agent_down_time to 60 seconds
  changed the CPU usage to 1%, and allowed bulk operations on a larger
  scale. (In this case: Creating 30 instances at the same time with 60
  ports). With the original values the operation failed (The instances
  did not get IP addresses), and with the new values we were able to
  boot 60 instances successfully. Side note: This flow will work better
  once the Nova-Neutron race is resolved, but that's orthogonal to this
  proposal.

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