[Bug 242747] geli: AMD Epyc+GELI not using Hardware AES

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242747

--- Comment #28 from Eirik Oeverby <ltning-freebsd at anduin.net> ---
(In reply to John Baldwin from comment #27)
Is that something that is likely to happen any time soon? :)

It turns out that with 12.2 (and probably earlier, I don't know since we didn't
do this earlier) the impact of enabling geli for a large number of disks (SSDs
in our case, 8-24 devices depending on the system) is that system loads average
much, much higher than normal. Reducing number of threads immediately brings
load back down.

Note: This is not limited to AMD/EPYC - most recently we saw it have pretty
dramatic effect on Intel servers, too.

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