This is tracking the upstream effort needed to deliver the solution to the bug described below.

 Problem Description: Clearly explain the issue.

When using Service Monitoring and ovn-ic, both ovn-northd and ovn-ic start using 100% CPU. ovsdb-server (SB) also starts using high CPU.

 Impact Assessment: Describe the severity and impact (e.g., network down,availability of a workaround, etc.).

Unnecessary CPU usage when ic and Service Monitor are used together

 Software Versions: Specify the exact versions in use (e.g.,openvswitch3.1-3.1.0-147.el8fdp).

Upstream main

  Issue Type: Indicate whether this is a new issue or a regression (if a regression, state the last known working version).

Introduced by "ic: Implement cross-AZ service monitor synchronization."

 Reproducibility: Confirm if the issue can be reproduced consistently. If not, describe how often it occurs.

This can be reproduced within test "Service Monitor synchronization" in ovn-ic.at. 

 Reproduction Steps: Provide detailed steps or scripts to replicate the issue.

Within test "Service Monitor synchronization" in ovn-ic.at, add following at the end of the test:

grep -c Service_Monitor $az/ovn-sb/ovn-sb.db

if there was no issue, it should be low (e.g. 20). But it has been seen as around 2000.

sb db shows Service_Monitor being updated over and over by ic and northd.

 Expected Behavior: Describe what should happen under normal circumstances.

ovn-northd and ovn-ic should not fight to write in SB.

 Observed Behavior: Explain what actually happens.

ovn-northd and ovn-ic fight to write in SB.

 Troubleshooting Actions: Outline the steps taken to diagnose or resolve the issue so far.

Run top while test is running, and see ovn-northd and ovn-ic using high CPU usage.

Both ovn-ic and ovn-northod are trying to update Service_Monitor options az-name, but their updates are differing by the _comment.

 Logs: If you collected logs please provide them (e.g. sos report, /var/log/openvswitch/* , testpmd console)