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Subject[REGRESSION 2.6.28-rc2-git3] lots of extra timer interrupts costing 2W
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I've noticed that sometime between 2.6.27-git7 and 2.6.28-rc2-git3,
powertop is reporting a huge number of excess timer interrupts on my
x61s laptop:

Wakeups-from-idle per second : 617.8 interval: 3.1s
no ACPI power usage estimate available

Top causes for wakeups:
71.3% (543.7) <interrupt> : extra timer interrupt
13.5% (103.0) <kernel core> : hrtimer_start_expires (tick_sched_timer)
7.2% ( 55.0) <kernel IPI> : Rescheduling interrupts
1.7% ( 13.0) gnome-terminal : hrtimer_start_expires (hrtimer_wakeup)
1.4% ( 10.3) <interrupt> : PS/2 keyboard/mouse/touchpad
1.1% ( 8.3) <interrupt> : ahci
0.4% ( 3.3) multiload-apple : hrtimer_start_expires (hrtimer_wakeup)
0.3% ( 2.7) Xorg : hrtimer_start (it_real_fn)


This is costing me an extra 2 Watts or so. Does this ring a bell with
anyone, before I start trying to bisect this problem?

- Ted


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