High CPU and memory issues on the NSX Manager running 6.4.4 to 6.4.6 releases.

Products

• VMware NSX

Issue/Introduction

• Identifying what is causing the CPU contention and high memory.

Symptoms:

• High CPU and high memory consumption is observed on the NSX manager.
• Communication channel intermittently going down would be observed.
• Issues publishing Firewall rules may be observed
• Running "Show process monitor" one would observe beam.smp consuming more than 40% memory continuously. 

7723 root 20 0 9.978g 6.276g 0.0 40.1 2:08.21 S `- beam.smp

• In the NSX Manager vsm.log, you may see entries similar to the below:

2021-03-24 11:58:48.671 IST INFO pool-15-thread-1 HighCPUStatsCollection:88 - - [nsxv@6876 comp="nsx-manager" subcomp="manager"] >ThreadDump and Top Output dumping failed

Cause

• This is an issue that was identified in NSX 6.4.4, 6.4.5 and 6.4.6, RabbitMQ fails to clear unused memory.

Resolution

• This issue is resolved in NSX 6.4.8

Workaround:
For a workaround please create a Support Request with Global Support and reference this KB. To create an SR reference the following KB: https://kb.vmware.com/s/article/2006985

Additional Information

Impact/Risks:

• Firewall publishing may fail
• VMs that are vMotioned or newly created VMs may experience impact