Observation on NOHZ_FULL

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Hi Guys,
Something caught my eye in [1] which a colleague pointed me to
 - CONFIG_HZ=1000 : 14866.05 bogo ops/s
 - CONFIG_HZ=1000+nohz_full : 18505.52 bogo ops/s

The test in concern is:
stress-ng --matrix $(getconf _NPROCESSORS_ONLN) --timeout 5m --metrics-brief

which is a CPU intensive test.

Any thoughts on what else can attribute a 30% performance increase
versus non-nohz_full ? (Confession: No idea if the baseline is
nohz_idle or no nohz at all). If it is 30%, I may want to evaluate
nohz_full on some of our limited-CPU devices :)

Cheers,

 - Joel

[1] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2051342




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