jhb 329536bd48 Flip the switch and don't route interrupts to hyperthreads in a HT system.
In at least one benchmark this showed around a 20% performance increase.
If other workloads do benefit from having hyperthreads service interrupts,
we can always make this a loader tunable.

MFC after:	3 days
Tested by:	ps
2006-03-09 16:38:52 +00:00
..
2006-03-08 20:21:54 +00:00