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

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

--- Comment #53 from Chattrapat Sangmanee <aomsin27@hotmail.co.th> ---
(In reply to Justin Hibbits from comment #49)

Here is g5 test results:

no tbsync, no revert = panic on boot with mtx_lock() by idle thread...
https://i.imgur.com/JUI9bmm.jpeg

no tbsync, revert both = work fine

tbsync, no revert = work fine

no tbsync, revert only a6ca7519f89 = panic on boot just like above

Conclusion: 3f24b5056 is the real culprit but tbsync acts as "band-aid" hiding
the true cause.

I'm not sure what to do in this case, how about apply new code only on little
endian mode? I'm sure everyone with modern stuff use that nowadays so it's not
too bad to me.

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