Comment 89 for bug 524281

I've got such results in Arch Linux:

Top causes for wakeups:
  25,0% ( 25,1) <kernel IPI> : Rescheduling interrupts
  19,0% ( 19,1) <kernel core> : hrtimer_start_range_ns (tick_sched_timer)
  11,3% ( 11,3) firefox : hrtimer_start_range_ns (hrtimer_wakeup)
  11,2% ( 11,2) <interrupt> : ath
  10,2% ( 10,3) <kernel core> : hrtimer_start (tick_sched_timer)
   9,9% ( 9,9) radeon/1 : queue_delayed_work (delayed_work_timer_fn)
   8,1% ( 8,1) <interrupt> : ahci
   1,0% ( 1,0) powernowd : hrtimer_start_range_ns (hrtimer_wakeup)
   0,5% ( 0,5) <interrupt> : ohci_hcd:usb4, ohci_hcd:usb6, radeon
   0,5% ( 0,5) kwin : hrtimer_start_range_ns (hrtimer_wakeup)

2.6.34-ARCH #1 SMP PREEMPT Mon Jul 5 22:12:11 CEST 2010 x86_64 AMD Athlon(tm) 64 X2 Dual Core Processor 5000+ AuthenticAMD GNU/Linux