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Date: Tue, 16 Dec 2008 21:58:12 +0100 From: "Vedran Rodic" <vrodic@...il.com> To: linux-kernel@...r.kernel.org Subject: Power management regression - rescheduling interrupts - Thinkpad X60s Hello, I've recently started testing the 2.6.28-rc8 release kernel (git versions actually). I've avoided previous releases after 2.6.22 because of problems with the wireless driver. My default kernel is 2.6.22-3 from Debian. The new kernel is making the laptop use more power, and is spending more almost all the time in C2 state when idle versus spending most of the time in C3 state on 2.6.22. It seems that the problem started occurring somewhere arround 2.6.24 for some people. When I remove the thinkpad_acpi, ehci_hcd and uhci_hcd modules, there are a lot less of <kernel IPI> : Rescheduling interrupts wakeups, but still there are some, and obviously I can't have a functional system without usb and the thinkpad_acpi enabled. Here is the powertop output, system is running KDE (I see kernel IPI wakeups even without X running), and no additional software. 2.6.28-rc8 powertop: Cn Avg residency P-states (frequencies) C0 (cpu running) ( 7.7%) 1.67 Ghz 1.5% polling 0.0ms ( 0.0%) 1333 Mhz 0.0% C1 halt 0.0ms ( 0.0%) 1000 Mhz 98.5% C2 5.6ms (76.9%) C3 1.7ms (15.5%) Wakeups-from-idle per second : 228.8 interval: 15.0s Power usage (ACPI estimate): 12.4W (1.6 hours) Top causes for wakeups: 43.2% ( 82.4) <kernel IPI> : Rescheduling interrupts 12.8% ( 24.3) <interrupt> : extra timer interrupt 12.1% ( 23.1) <interrupt> : ehci_hcd:usb1, uhci_hcd:usb5 12.1% ( 23.1) USB device 1-5.3.3 : USB Optical Mouse (Logitech) 6.2% ( 11.8) <kernel core> : hrtimer_start (tick_sched_timer) 4.0% ( 7.7) <kernel core> : ehci_work (ehci_watchdog) 2.1% ( 4.0) <kernel module> : usb_hcd_poll_rh_status (rh_timer_func) 1.4% ( 2.7) <interrupt> : acpi 0.6% ( 1.1) kwin : schedule_hrtimeout_range (hrtimer_wakeup) 0.6% ( 1.1) Xorg : schedule_hrtimeout_range (hrtimer_wakeup) 2.6.22-3-686 (Debian) powertop: Cn Avg residency P-states (frequencies) C0 (cpu running) ( 1.4%) 1.67 Ghz 1.0% C1 0.0ms ( 0.0%) 1333 Mhz 0.0% C2 5.3ms ( 5.7%) 1000 Mhz 99.0% C3 14.0ms (92.9%) Wakeups-from-idle per second : 77.3 interval: 20.0s Power usage (ACPI estimate): 11.3W (2.4 hours) Top causes for wakeups: 21.0% ( 11.5) <interrupt> : uhci_hcd:usb4, ehci_hcd:usb5 20.5% ( 11.2) cpufreq-set : queue_delayed_work_on (delayed_work_timer_fn 18.3% ( 10.0) <kernel core> : ehci_work (ehci_watchdog) 9.7% ( 5.3) <interrupt> : extra timer interrupt 5.1% ( 2.8) <kernel core> : queue_delayed_work_on (delayed_work_timer_fn 3.6% ( 1.9) <interrupt> : ahci 3.1% ( 1.7) Xorg : schedule_timeout (process_timeout) 2.7% ( 1.5) konsole : schedule_timeout (process_timeout) This was discussed previously in: http://www.bughost.org/pipermail/power/2007-December/001192.html https://bugzilla.redhat.com/show_bug.cgi?id=438974 http://kerneltrap.org/mailarchive/linux-kernel/2008/1/21/589349 But the resolution was inconclusive. Suggested echo 1 > /sys/devices/system/cpu/sched_mc_power_savings fails because the file doesn't exist anymore. The config files, info about the hardware and dmesg (kmesg.log actually) from 2.6.28-rc8 is at http://bljak.org/~vedran/bugs/kernel-2.6.28-rc8/ Thanks, Vedran Rodic -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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