Hi; With Linus's latest git, powertop reports following while system nearly %100 idle;
PowerTOP version 1.9 (C) 2007 Intel Corporation Cn Avg residency P-states (frequencies) C0 (cpu running) ( 6,3%) 1,84 Ghz 0,4% C1 0,0ms ( 0,0%) 1333 Mhz 0,0% C2 0,1ms ( 0,5%) 1000 Mhz 99,6% C3 3,7ms (93,2%) Wakeups-from-idle per second : 306,8 interval: 10,0s Power usage (5 minute ACPI estimate) : 23,1 W (0,5 hours left) Top causes for wakeups: 59,9% (238,4) <kernel IPI> : Rescheduling interrupts ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 14,7% ( 58,6) amarokapp : schedule_timeout (process_timeout) 5,5% ( 21,9) java : futex_wait (hrtimer_wakeup) 5,0% ( 19,8) <interrupt> : iwl3945 2,5% ( 10,0) java : schedule_timeout (process_timeout) 2,5% ( 10,0) <kernel core> : ehci_work (ehci_watchdog) 2,5% ( 10,0) <interrupt> : extra timer interrupt 1,6% ( 6,4) artsd : schedule_timeout (process_timeout) 1,0% ( 4,0) <kernel module> : usb_hcd_poll_rh_status (rh_timer_func) 0,5% ( 2,0) <interrupt> : ohci1394, uhci_hcd:usb4, nvidia 0,5% ( 2,0) <kernel core> : clocksource_check_watchdog (clocksource_watchdog) 0,5% ( 2,0) kwin : schedule_timeout (process_timeout) 0,5% ( 1,9) wpa_supplicant : schedule_timeout (process_timeout) 0,3% ( 1,2) kdesktop : schedule_timeout (process_timeout) 0,3% ( 1,0) kwrapper : do_nanosleep (hrtimer_wakeup) 0,3% ( 1,0) klipper : schedule_timeout (process_timeout) 0,3% ( 1,0) artsd : do_setitimer (it_real_fn) 0,3% ( 1,0) gpg-agent : schedule_timeout (process_timeout) 0,3% ( 1,0) X : nv_start_rc_timer (nv_kern_rc_timer) 0,3% ( 1,0) kicker : schedule_timeout (process_timeout) 0,1% ( 0,5) iwl3945 : ieee80211_authenticate (ieee80211_sta_timer) 0,1% ( 0,5) <kernel core> : neigh_table_init_no_netlink (neigh_periodic_timer) This "<kernel IPI> : Rescheduling interrupts" causes at least 200 wakeups (sometimes i see ~400 wakeups) for me and a quick google search yields [1], but i didn't see this reported to LKML, so here it is :). If anything else is needed please yell... [1] http://www.mail-archive.com/[EMAIL PROTECTED]/msg01009.html -- S.Çağlar Onur <[EMAIL PROTECTED]> http://cekirdek.pardus.org.tr/~caglar/ Linux is like living in a teepee. No Windows, no Gates and an Apache in house!
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