High CPU utilization on NM2 InfiniBand Switches (Doc ID 2146310.1)

Last updated on AUGUST 24, 2016

Applies to:

Sun Network QDR InfiniBand Gateway Switch - Version All Versions to All Versions [Release All Releases]
Sun Datacenter InfiniBand Switch 36 - Version All Versions to All Versions [Release All Releases]
Information in this document applies to any platform.

Symptoms

NM2 InfiniBand switches may have slower responses to ssh logins, web logins, diagnostic commands etc.

Enterprise Manager monitoring NM2 InfiniBand switches may report higher than normal CPU utilization i.e. >80% or even at max 100%

Please refer to note 2152997.1 on how to use Enterprise Manager to monitor CPU on InfiniBand switches.

Users logged in shell of IB switch may observe almost 0% idle time in output of top and vmstat. top output sample is provided below

On the IB switch, 'netstat -anp | grep webgo' -- the output of this may have a few tcp sessions in CLOSE_WAIT state.

Cause

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