[Bug 234733] Setting CPU frequency with sysctl dev.cpu.0.fr slows a Ryzen 2700X down

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234733

--- Comment #20 from sigsys at gmail.com ---
Maybe it could do some double checking only once to "learn" about those
registers' behavior (and maybe have a sysctl to reset that to make it check
again)?  But if Linux ignores it entirely then you'd think it's probably safe
to do that everywhere in practice.  Maybe a sysctl/tunable to enable/disable
the check just in case?

On this one maybe that's not even an "implemented" register (if that makes
sense), it just follows the other one and can't really be set independently
(and it "follows" it wrong according to the specs it seems).  Really not sure I
understand most of this though.  If Linux (and maybe Windows too) ignores it
maybe the register is nonsense on other machines too and it goes unnoticed.

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