[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 #34 from Mitch <mitch_com@hotmail.com> ---
Comment on attachment 251226
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=251226
Kernel Trap

Sorry, I tried to add a comment with this screenshot but it didn't quite work
as expected :)

So first of all reverting c583b02587 did nothing at all as I'm observing the
same symptoms as Ben.

I've managed to painfully install the lastest snapshot with a machine
continually freezing (running okay for 15 secs then fans running full blast
during which the computer is unresponsive for a minute of so).

Once the install completed, I did a reboot and I was welcomed by a Fatal Kernel
Trap like the one I've posted, sometimes I get to see it and others the machine
reboots immediately. 

I then tried to take an image from the drive with my FreeBSD PC but I can't see
any partitions on it (I don't remember if the install wizard defaults to UFS or
ZFS).

Please let me know if that would be of any use for troubleshooting.

I haven't yet tried Ben's patches but if it works for him there is a chance it
would work for me as we're using the same HW, I'm super happy that we're making
some progress !


Also there is something rather strange I've noticed with recent Images, If I
boot them while holding C (cdrom) all I get is a black screen with fans roaring
immediately 

but if I use the option key instead and wait for the watch cursor to turn back
to a regular mouse cursor I'm able to boot just fine, I'm guessing that might
be caused by a bunch of OF variables.


Thanks everyone for your efforts so far !

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