Bug 13857

My system: ASUS P2B-DS (BX chipset), dual PIII 450MHz, Matrox G200, 256MB RAM, Intel
Etherexpress 10/100 PCI card, FreeBSD 3.2-R.
When running two or more jobs with SMP kernel that use a lot of CPU
time, the screen freezes, reboot and login commands take forever, etc.
Ps and top commands show 0.0% of CPU usage.
If the same jobs are running on only one processor (i.e. with disabled
SMP and APIC options in kernel) everything is fine.
I have a similar machine (ASUS P2L97-DS, LX chipset, 3.0-R) 
and was able to boot kernel from P2L97 on P2B mobo. Freezing effects
remains. I've also got a message from one person that uses P2B-DS and
he emailed me his version of a kernel configuration file. I have 
recompiled kernel with these options but it didn't help. 
My first impression was that this is a motherboard failure but
I have installed Linux (Debian) and all problems disapeared :(
Finally I've contacted with my vendor and I was told that this
motherboard is a version especially for PIII, i.e it won't work 
with PII (I've checked it, it's true). 
My feeling is that ASUS something changed with the design of P2B-DS
and this causes the problem.

Fix: 

Renice jobs to 15 or install Linux.
Both solutions are unacceptable.
How-To-Repeat: Install FreeBSD on a SMP machine with ASUS P2B-DS motherboard that
works only with PIII, then run any two or more programs eating CPU time.