High CPU usage during idle state


CPU usage spikes from time to time when there is no heavy process running.
It spikes every 2 minutes.

Is there any method to check this situation?

From top command, beam.smp was the process that occupies most of the CPU usage.
I’m not using view, index, or xdcr.
OPS is 0.

DB Info
couchbase 4.1.0-5005
Amazon linux

[Couchbase Bucket monitoring]

IOSTAT [Couchbase install Drive]