https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209202

Mark Millard <[email protected]> changed:

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--- Comment #2 from Mark Millard <[email protected]> ---
(In reply to gmbroome from comment #1)

I'm the author of "PowerMac G5 quad-core, CPU A1 DIODE TEMP" from back in
2015-Jan.

At the time I had side by side comparison machines that were a mix of working
well vs. overheating. My conclusion was that the cooling systems were in a
failure mode for those overheating --since other matching machines were doing
fine.

As I remember Mac OS X had fancier handling of the issue that prevented
crashing by forcing idle time in addition to fan-speed control but the result
was a large difference in performance for "works well" vs. "overheating" for
the same load.

At the time some FreeBSD changes were made by Justin Hibbits that did improve
things some for the problem machines. But the overheating machines were pretty
far gone and I gave up on them.

I returned those that were overheating. So I no longer have a test-context for
overheating.

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