On Aug 19, 11:39pm, Takayoshi Kochi wrote:
} 
} I looked into the problem of MPACPI related panics and am trying to
} fix it.  If you had any panic with the existing MPACPI code,
} please try the patch attached to this message ASAP, so that
} we can make it for 2.0-release.

     I tried it on the weekend.  I can report some degree of success.
First I upgraded the machine (ASUS P4P800 MB) to the latest BIOS
(1016).  This didn't help.  Then I upgraded it from 1.6ZL to 2.0E
(20040509) which didn't help.  Finally, I applied your patch.  That
worked.  The machine is now happily running with two "CPUs"
(hyperthreading actually).

     However, USB isn't functional with a multiprocessor kernel.  I
have no idea if this is related to the MPAPCI stuff though.  When I
plug in a USB device, it complains that there is a problem and it shuts
down the port.  If I boot a non-multiprocessor GENERIC kernel, the
device works fine.

     Also, I see some rather interesting output from 'ps auwwx':

root        1  0.0  0.0   72    220 ??  Ss    3:23PM   0:-37.33 init
root        4  0.0 10.1    0 158432 ??  DK    3:23PM   0:-1.95 [usb0]
root        6  0.0 10.1    0 158432 ??  DK    3:23PM   0:-1.69 [usb1]
root        7  0.0 10.1    0 158432 ??  DK    3:23PM   0:-1.54 [usb2]
root        8  0.0 10.1    0 158432 ??  DK    3:23PM   0:-1.33 [usb3]
root      596  0.0  0.0  236    508 ??  Is    3:24PM   0:-1.45 /usr/sbin/cron
root    29015  0.0  0.1 1144   1140 p2  I     6:19PM   0:-1.94 -tcsh -m

}-- End of excerpt from Takayoshi Kochi