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

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

--- Comment #15 from sigsys at gmail.com ---
It would already be pretty good if the kernel could detect the situation by
double checking on one of those registers and log a warning.  Assuming it
wouldn't risk causing even more problems on some other systems.  Or maybe
report it as another sysctl variable so that the mismatch could be seen more
easily. I only noticed that something was off when make world took much more
time than expected.

But if that only happens with certain BIOS versions of one particular
motherboard I guess it might not be worth trying to deal with it at all. And
that might be the case here. Alright I'm gonna try 3.50 and see if the
weirdness goes away. I haven't tried that motherboard with another OS yet. I
could try to boot a linux USB stick and try to see how it deals with it if
upgrading the BIOS doesn't fix it.

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