[Bug 243212] High CPU usage when set affinity on multiple CPU

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243212

--- Comment #1 from Luca Pizzamiglio <pizzamig at freebsd.org> ---
Created attachment 210564
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=210564&action=edit
The grpah showing the drop in cpu usage

The image show the cpu usage when we passed from 6 to 4 threads on FreeBSD 12.1
The CPU usage with 4 threads on FreeBSD is comparable with the CPU usage with 6
thread on FreeBSD 11.3

Green line  : cpu user time
Yellow line : cpu system time
Cyan line   : cpu irq time

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