silent reboots, as with the uniprocessor case (e.g. PR# 10824) when doing
heavy filesystem work (make -j 2 build etc etc).

i will try making NKMEMPAGES bigger than the default 32740 since that tends
to help.

i guess if SOFTDEP and friends eat up lots of kmem, in a busy dual-processor
box, the problem could be worse...?

	Sean.