On OpenBSD on an Atom 450, with HPET configured in the BIOS and not, also with Hyperthreading/ACPI on-off, nothing seems to make a difference.
Here's my vmstat -iz
# vmstat 2
procs memory page disk traps cpu
r b w avm fre flt re pi po fr sr wd0 int sys cs us sy id
0 0 0 3488 981792 429 0 0 0 0 0 35 295771 906 89 1 51 48
0 0 0 3492 981788 12 0 0 0 0 0 0 278490 37 10 0 50 50
^C
# vmstat -iz
interrupt total rate
irq0/clock 12115 102
irq96/inteldrm0 0 0
irq133/ppb0 0 0
irq96/em0 0 0
irq84/ppb1 0 0
irq81/em1 0 0
irq131/ppb2 0 0
irq82/em2 0 0
irq132/ppb3 0 0
irq83/em3 0 0
irq84/uhci0 28 0
irq83/uhci1 0 0
irq84/ehci0 2 0
irq80/pciide0 877 7
irq82/pciide1 0 0
irq81/ichiic0 0 0
irq130/com0 451 3
irq129/pckbc0 0 0
Total 13473 114
The irq0/clock continues to go out of control, this is about 1minute after booting....
# vmstat -s
4096 bytes per page
252939 pages managed
245456 pages free
865 pages active
1015 pages inactive
0 pages being paged out
1 pages wired
0 pages zeroed
4 pages reserved for pagedaemon
6 pages reserved for kernel
132529 swap pages
0 swap pages in use
0 total anon's in system
0 free anon's
17558 page faults
17368 traps
47204661 interrupts
4703 cpu context switches
14 fpu context switches
17854 software interrupts
37197 syscalls
0 pagein operations
0 swap ins
0 swap outs
144 forks
13 forks where vmspace is shared
14 kernel map entries
0 number of times the pagedaemon woke up
0 revolutions of the clock hand
0 pages freed by pagedaemon
0 pages scanned by pagedaemon
0 pages reactivated by pagedaemon
0 busy pages found by pagedaemon
9096 total name lookups
cache hits (67% pos + 1% neg) system 0% per-directory
deletions 0%, falsehits 0%, toolong 0%
0 select collisions
Any ideas to reduce the load, thanks.