eventtimers hiccups

Hi,

since the new eventtimers code was committed, my notebook (Dell
Precision m4400) sometimes hangs for 10-30 seconds, mostly during load.
In these periods I can move the mouse pointer but time (as perceived by
time(1)) seems to be halted. This is accompanied by lots of calcru:
runtime went backwards message, though sometimes they only show up when
shutting down.

I now set kern.eventtimer.periodic=1 and have not experienced such
freezes since then. But it would be nice if the default settigs would
work. Is there something I could do to help fixing this?
BTW, I'm not using powerd.

sysctl kern.eventtimer gives this output:
kern.eventtimer.choice: HPET(450) HPET1(440) HPET2(440) HPET3(440) LAPIC(400) i8254(100) RTC(0)
kern.eventtimer.et.LAPIC.flags: 15
kern.eventtimer.et.LAPIC.frequency: 0
kern.eventtimer.et.LAPIC.quality: 400
kern.eventtimer.et.HPET.flags: 3
kern.eventtimer.et.HPET.frequency: 14318180
kern.eventtimer.et.HPET.quality: 450
kern.eventtimer.et.HPET1.flags: 3
kern.eventtimer.et.HPET1.frequency: 14318180
kern.eventtimer.et.HPET1.quality: 440
kern.eventtimer.et.HPET2.flags: 3
kern.eventtimer.et.HPET2.frequency: 14318180
kern.eventtimer.et.HPET2.quality: 440
kern.eventtimer.et.HPET3.flags: 3
kern.eventtimer.et.HPET3.frequency: 14318180
kern.eventtimer.et.HPET3.quality: 440
kern.eventtimer.et.RTC.flags: 17
kern.eventtimer.et.RTC.frequency: 32768
kern.eventtimer.et.RTC.quality: 0
kern.eventtimer.et.i8254.flags: 1
kern.eventtimer.et.i8254.frequency: 1193182
kern.eventtimer.et.i8254.quality: 100
kern.eventtimer.periodic: 1
kern.eventtimer.timer: HPET
kern.eventtimer.idletick: 0
kern.eventtimer.singlemul: 2

Cheers,
Stefan