[Bug 232153] Processes without explicit cpuset only use half the SMP threads (on a Ryzen)

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232153

Greg V <greg at unrelenting.technology> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |Not A Bug
             Status|New                         |Closed

--- Comment #3 from Greg V <greg at unrelenting.technology> ---
Hm, looks like the problem just disappeared after I… added a new fan to the
system and went into the UEFI Setup to configure fan speed??

Maybe there was something wrong with ACPI or something and saving the firmware
settings fixed them… Interesting that it didn't affect Windows 10 though.

(In reply to Eric van Gyzen from comment #2)
Desktop Ryzen is not NUMA, it only has one domain. Threadripper has two
domains, EPYC has four, but Ryzen only one. It has some 'NUMA-like' cache
groups as recognized in 'FreeBSD/SMP: 1 package(s) x 2 cache groups x 4 core(s)
x 2 hardware threads', but this is not actual NUMA.

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