The latest kernel update, 2.6.32-25-generic, has changed things a bit. At least in my case. Granted, I have changed some things to prevent cpu wakeups by adding hpet=force nohz=off highres=off to the GRUB CMDLINE since the kernel update 2.6.32-24 update. At that time Load Balancing ticks were still appearing, even when idle. With the 2.6.32-25 update there are wakeups but under a different name: [Rescheduling interrupts] <kernel IPI>. What is more surprising is that the wakeups are not appearing while idle which they were with the 2.6.32-24 and others before. I use a selfmade powersaving script but tested wakeups in Powertop before I activated the script and here are the results. NB! I have turned off some services. This was done on a desktop C2D E6550 with Lucid installed.
When idle (no mouse movement or anything): Wakeups-from-idle per second : 7,6 interval: 10,0s no ACPI power usage estimate available Top causes for wakeups: 30,5% ( 4,0) [kernel core] usb_hcd_poll_rh_status (rh_timer_func) 15,3% ( 2,0) [kernel core] clocksource_watchdog (clocksource_watchdog) 7,6% ( 1,0) [uhci_hcd:usb3, nvidia] <interrupt> 7,6% ( 1,0) gvfs-afc-volume 7,6% ( 1,0) [kernel core] nv_kern_rc_timer (nv_kern_rc_timer) 3,1% ( 0,4) nautilus 2,3% ( 0,3) clock-applet 2,3% ( 0,3) gnome-panel 2,3% ( 0,3) gedit 1,5% ( 0,2) rtkit-daemon 1,5% ( 0,2) [kernel core] inc_rt_group (sched_rt_period_timer) 1,5% ( 0,2) gnome-terminal 1,5% ( 0,2) gnome-settings- Here is when watching a HD movie: Wakeups-from-idle per second : 150,8 interval: 10,0s no ACPI power usage estimate available Top causes for wakeups: 42,3% (126,7) [ata_piix, ata_piix, HDA Intel] <interrupt> 20,9% ( 62,5) [Rescheduling interrupts] <kernel IPI> 16,4% ( 49,0) [uhci_hcd:usb3, nvidia] <interrupt> 8,5% ( 25,6) gnome-mplayer 8,1% ( 24,4) mplayer 1,3% ( 4,0) [kernel core] usb_hcd_poll_rh_status (rh_timer_func) 0,7% ( 2,0) [kernel core] clocksource_watchdog (clocksource_watchdog) 0,3% ( 1,0) [kernel core] inc_rt_group (sched_rt_period_timer) 0,3% ( 1,0) gvfs-afc-volume 0,3% ( 1,0) [kernel core] nv_kern_rc_timer (nv_kern_rc_timer) 0,1% ( 0,3) gnome-terminal 0,1% ( 0,3) gedit 0,1% ( 0,3) gnome-settings- 0,1% ( 0,3) clock-applet 0,1% ( 0,3) gnome-panel 0,1% ( 0,2) rtkit-daemon -- Tens of wakes per second in "[kernel scheduler] Load balancing tick" on Core 2 Duo even with only 1 core enabled https://bugs.launchpad.net/bugs/524281 You received this bug notification because you are a member of Registry Administrators, which is the registrant for Debian. _______________________________________________ Mailing list: https://launchpad.net/~registry Post to : [email protected] Unsubscribe : https://launchpad.net/~registry More help : https://help.launchpad.net/ListHelp
