[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 #20 from Justin Hibbits <jhibbits@FreeBSD.org> ---
(In reply to Sergey Fedorov from comment #15)

Unfortunately I think the number of committers with PowerMac G5 hardware
supporting FreeBSD is dwindling as the machines age.  My only G5 that ran
FreeBSD died back in 2018, so I'm unable to do anything significant for it.

That said, I'll support as best as I can.

Regarding the "USB error upon intro screen load" that's often solved by
unplugging/plugging the device (happens all the time with one of my FTDI
debuggers), not a problem with FreeBSD itself.

The "Root mount waiting for usbus2", unless you have root on USB you can try
setting the hw.usb.no_boot_wait tunable; it looks like usbus2 is having
enumeration problems (just a guess).

For 13.x performance, you can try testing a commit before, and after,
c583b02587 (PowerMac timebase sync for G4), which should be a nop for G5, but
might not be.  Other possibilities are pmap related (superpage support was
added in the 13 timeframe, I believe).

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