EasyPeasy Overview

Power usage is too high

Bug #415661 reported by Morten Mjelva
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
EasyPeasy Overview
New
Medium
mb74

Bug Description

Easy Peasy uses approx. 2-3 watts more power than Ubuntu does at this time.
This is pretty critical, and I hope you will look into it.
This affects EP1.5rc. I use a EEE 1000H.

Wakeups-from-idle per second : 145.9 interval: 10.0s
Power usage (ACPI estimate): 13.3W (3.7 hours) (long term: 16.4W,/3.0h)

Top causes for wakeups:
  43.7% (520.5) <kernel core> : hrtimer_start_range_ns (tick_sched_timer)
  23.2% (276.0) <kernel IPI> : TLB shootdowns
   8.5% (101.5) firefox-3.5 : hrtimer_start_range_ns (hrtimer_wakeup)
   6.3% ( 74.6) <interrupt> : PS/2 keyboard/mouse/touchpad
   4.3% ( 50.7) <kernel IPI> : Rescheduling interrupts
   2.2% ( 26.8) f-spot : hrtimer_start_range_ns (hrtimer_wakeup)
   2.1% ( 25.5) <interrupt> : uhci_hcd:usb3, ra0
   2.1% ( 24.6) <interrupt> : ata_piix
   1.7% ( 20.0) gnome-do : hrtimer_start_range_ns (hrtimer_wakeup)
   1.2% ( 14.4) <interrupt> : uhci_hcd:usb5, HDA Intel, i915@pci:0000:00:02.0
   1.0% ( 11.5) Xorg : hrtimer_start_range_ns (hrtimer_wakeup)
   0.8% ( 10.0) NetworkManager : mod_timer (linux_MlmePeriodicExec)
   0.5% ( 6.0) Xorg : hrtimer_start (it_real_fn)
   0.5% ( 5.5) <interrupt> : acpi
   0.5% ( 5.5) <kernel core> : mod_timer (cfq_idle_slice_timer)
   0.4% ( 4.2) hald : schedule_timeout (process_timeout)
   0.1% ( 1.7) gnome-terminal : hrtimer_start_range_ns (hrtimer_wakeup)

See original description
Morten Mjelva (mortenmjelva)
description: updated
description: updated
Morten Mjelva (mortenmjelva)
description: updated
Revision history for this message
Jon Ramvi (ramvi) wrote :

Assigned to kernel hacker mrb74

Changed in easypeasy:
assignee: nobody → mb74 (mrb74)
importance: Undecided → Medium
Revision history for this message
mb74 (mrb74) wrote :

I see that you are running firefox while you measure the power consumption. To have a good comparison it is not recommended to run such apps while running powertop. AFAIK firefox wakes up the CPU very often, which causes a much higher power consumption. Also the version of programs can make a big difference. So please to have a fair comparison please repeat running powertop while not running any apps like firefox or office, etc.

Revision history for this message
Morten Mjelva (mortenmjelva) wrote :

Cn Avg residency P-states (frequencies)
C0 (cpu running) ( 5.2%) 1.60 Ghz 3.9%
polling 0.0ms ( 0.0%) 1333 Mhz 0.3%
C1 mwait 0.0ms ( 0.0%) 1067 Mhz 0.0%
C2 mwait 0.0ms ( 0.0%) 800 Mhz 95.7%
C4 mwait 2.6ms (94.8%)

Wakeups-from-idle per second : 364.9 interval: 10.0s
Power usage (ACPI estimate): 10.8W (2.0 hours)

Top causes for wakeups:
  32.4% ( 85.8) <interrupt> : PS/2 keyboard/mouse/touchpad
  22.9% ( 60.8) <interrupt> : uhci_hcd:usb3, ra0
  12.6% ( 33.3) <kernel core> : hrtimer_start_range_ns (tick_sched_timer)
   7.2% ( 19.0) <kernel core> : hrtimer_start (tick_sched_timer)
   5.7% ( 15.0) Xorg : hrtimer_start_range_ns (hrtimer_wakeup)
   5.4% ( 14.4) <kernel IPI> : Rescheduling interrupts
   4.1% ( 11.0) <kernel core> : mod_timer (ehci_watchdog)
   3.8% ( 10.0) NetworkManager : mod_timer (linux_MlmePeriodicExec)
   1.0% ( 2.6) <interrupt> : acpi
   0.8% ( 2.0) <interrupt> : ehci_hcd:usb1, uhci_hcd:usb2
   0.8% ( 2.0) <kernel core> : clocksource_register (clocksource_watchdog)
   0.7% ( 1.8) gnome-terminal : hrtimer_start_range_ns (hrtimer_wakeup)
   0.5% ( 1.2) USB device 1-5 : Mass Storage Device (Generic)
   0.4% ( 1.0) wpa_supplicant : hrtimer_start_range_ns (hrtimer_wakeup)

Suggestion: increase the VM dirty writeback time from 5.00 to 15 seconds with:
  echo 1500 > /proc/sys/vm/dirty_writeback_centisecs
This wakes the disk up less frequently for background VM activity

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