Are you running a tickless kernel? I'd guess that the "extra timer interrupt" is the former timer interrupt, which will cause 1000 wakeups if you're running a 1000hz kernel. Tickless kernels do not wake up because of that interrupt.
Your CPU has only 1 ms in C3 state - this could be caused by a 1000hz kernel as well, because it will wake up every ms. Peter On Sun, 2007-05-27 at 10:36 +0200, Antoine Caillau wrote: > 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 > ) > > _______________________________________________ > Power mailing list > [email protected] > http://www.bughost.org/mailman/listinfo/power _______________________________________________ Power mailing list [email protected] http://www.bughost.org/mailman/listinfo/power
