John Baldwin writes: > Index: sys/kern/kern_intr.c Looks OK to me! Appears to work too. I'd drop the estimate down to 1 bit instead of 2 for now. Keeping the estimate really low is safe. Thanks, John. M -- Mark R V Murray Cert APS(Open) Dip Phys(Open) BSc Open(Open) BSc(Hons)(Open) Pi: 132511160