Reported at: https://bugs.launchpad.net/neutron/+bug/1883554 Every time the agent liveness check is triggered (via API or periodically every agent_down_time / 2 seconds), there are a lot of writes into the SB database on the Chassis table. These writes triggers recomputation on ovn-controller running in all nodes having a considerable performance hit, especially under stress. After this commit was merged [0] we avoided bumping nb_cfg too frequently but still we're performing writes into the Chassis table to often, from all the workers. We should use the same logic in [1] to avoid writes that have happened recently. [0] https://opendev.org/openstack/neutron/commit/647b7f63f9dafedfa9fb6e09e3d92d66fb512f0b [1] https://github.com/openstack/neutron/blob/4de18104ae88a835544cefbf30c878aa49efc31f/neutron/plugins/ml2/drivers/ovn/mech_driver/mech_driver.py#L1075
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (Red Hat OpenStack Platform (RHOSP) 16.2 enhancement advisory), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHEA-2021:3483