Extra Timer Interrup

[Antoine Caillau]

Hi,

Since 1.4 (or may be 1.3, I do not tested) I've a process who wake up my CPU
a lot. It is called "extra timer interrupt". Can anyone tell me what it is ?


Thanks a lot for your help.

Antoine

     PowerTOP version 1.4       (C) 2007 Intel Corporation

Cn          Avg residency (5s)  Long term residency avg
C0 (cpu running)        (19.6%)
C1                0.0ms ( 0.0%)                   0.0ms
C2                3.4ms ( 3.7%)                   2.2ms
C3                1.0ms (76.7%)                   1.0ms


Wakeups-from-idle per second : 815.9
Power usage (ACPI estimate) :  11.3 W (5.4 hours left)

Top causes for wakeups:
  95.6% (1166.6)       <interrupt> : extra timer interrupt
   1.1% ( 13.8)       <interrupt> : ohci1394, ipw3945
   0.7% (  8.8)       <interrupt> : ehci_hcd:usb1, uhci_hcd:usb2
   0.3% (  3.4)   <kernel module> : usb_hcd_poll_rh_status (rh_timer_func)
   0.3% (  3.4)             pcscd : do_nanosleep (hrtimer_wakeup)
   0.2% (  2.8)        powersaved : queue_delayed_work_on
(delayed_work_timer_fn
)
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