[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 #48 from Chattrapat Sangmanee <aomsin27@hotmail.co.th> ---
So I spend whole day testing this, with very positive results minus some loader
annoyances.

This is late 2005 G5 pcie with dual core 970MP with 8GB ram

After finished install, if i let it autoboot by itself, after loader's "Press
enter to boot now or wait 10 secs" it will stuck on black screen forever with
fan at max speed. But if i boot it manually with command "boot hd:,\\:tbxi" it
will boot normally.

Other than that it works flawlessly. It never panic not even once. Even after
100 reboots.

Here is what i did:

- Apply tbsync patch from comment #30
- Revert commit 3f24b5056 and a6ca7519f89

Also this is not about g5 but maybe related:

On my ps3 it is working most of the time but sometimes will panic such as "Data
Storage Interrupt" or something like that.

I don't know how to trigger it but if it going to panic, it will happen shortly
after power on when spawning new process such as while booting, login, or
execute command shortly after login. If it going to work fine, it will work for
days or weeks no problem at all. I looked at ps3 code and don't see anything
wrong so i suspect that ppc code itself is broken somewhere. Maybe this is
related or just coincidence? After applying these revert it never panic again
but maybe too early to tell.

That's why i must ask other people to test this iso:
https://drive.google.com/file/d/1svtLlWKUW3l7fGBw_ex24BmbbAMENDw5/view

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