OpenStack - High ovs-vswitchd CPU usage when VRRP over VXLAN tunnel causing qrouter fail-over

Solution Verified - Updated -

Issue

  • High CPU utilization by ksoftirqd/N in nodes running l3_agent that hosts the qrouter
  • Run out of unique tuple src_address:src_port used for the SNAT.
  • OpenvSwitch revalidator threads failing and qrouter involuntary failover

Environment

  • Red Hat OpemStack Platform (RHOSP) 13
  • Red Hat Enterprise Linux 7
  • kernel <3.10.0-971

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