[Bug 271826] FreeBSD is disastrously slow on a PowerMac G5, freezing at every command

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271826

ben@desync.com changed:

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--- Comment #28 from ben@desync.com ---
Created attachment 251098
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=251098&action=edit
timebase sync hack

I'm not sure my symptoms exactly match what's described here, but it seems like
timebase sync may be broken on G5.  ofwcons freezes for about a minute every so
often, the fans go full blast at the same time because powermac_thermal is
hung.  The system is usually (always?) responsive over ssh while this is
happening.

Anyway, the attached hack seems to help in my case, as least.  Only tested on
the later PCIe dual and quad G5s.  I'm not sure timebase sync is even supported
on PCI-X powermacs (definitely not on my Xserve G5 with weird sync via I2C).

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