[Bug 524281] Re: Tens of wakes per second in "[kernel scheduler] Load balancing tick" on Core 2 Duo with 1 core disabled in BIOS

[Jeffrey Baker]

# powertop -d
PowerTOP 1.12   (C) 2007, 2008 Intel Corporation 

Collecting data for 15 seconds


Your CPU supports the following C-states : C1 C2 C3 C4 
Your BIOS reports the following C-states : C1 C2 C3 
Cn	          Avg residency
C0 (cpu running)        (31.1%)
C0		  0.0ms ( 0.0%)
C1 mwait	  0.0ms ( 0.0%)
C2 mwait	  0.1ms ( 0.0%)
C3 mwait	  4.8ms (68.9%)
P-states (frequencies)
Turbo Mode    15.7%
  2.00 Ghz     0.1%
  1.60 Ghz     0.1%
  1200 Mhz     0.2%
   800 Mhz    84.0%
Disk accesses:
The application 'firefox-bin' is writing to file 'sessionstore-1.js' on /dev/sda1
The application 'firefox-bin' is writing to file 'sessionstore-1.js' on /dev/sda1
The application 'firefox-bin' is writing to file '_CACHE_001_' on /dev/sda1
The application 'firefox-bin' is writing to file '_CACHE_001_' on /dev/sda1
The application 'firefox-bin' is writing to file '_CACHE_001_' on /dev/sda1
Wakeups-from-idle per second : 145.1	interval: 15.0s
no ACPI power usage estimate available
Top causes for wakeups:
  71.1% (296.3)   [kernel scheduler] Load balancing tick
   7.7% ( 32.2)   [Rescheduling interrupts] <kernel IPI>
   3.7% ( 15.3)D  firefox-bin
   3.9% ( 16.3)   [acpi] <interrupt>
   3.3% ( 13.9)   [iwlagn] <interrupt>
   2.5% ( 10.5)   [i915 at pci:0000:00:02.0] <interrupt>
   2.3% (  9.5)   PS/2 keyboard/mouse/touchpad interrupt
   1.0% (  4.3)   Xorg
   1.0% (  4.0)   [kernel core] usb_hcd_poll_rh_status (rh_timer_func)
   0.9% (  3.6)   [ahci] <interrupt>
   0.6% (  2.6)   [kernel core] hrtimer_start (tick_sched_timer)
   0.3% (  1.2)   gnome-terminal
   0.2% (  1.0)   gvfs-afc-volume
   0.2% (  0.7)   top
   0.2% (  0.7)   compiz
   0.1% (  0.5)   python
   0.1% (  0.4)   update-notifier
   0.1% (  0.3)   [eth1] <interrupt>
   0.1% (  0.3)   events/0
   0.1% (  0.3)   [kernel core] inc_rt_group (sched_rt_period_timer)
   0.1% (  0.3)   clock-applet
   0.0% (  0.2)   gnome-settings-
   0.0% (  0.2)   indicator-apple
   0.0% (  0.2)   gnome-panel
   0.0% (  0.2)   gnome-power-man
   0.0% (  0.2)   bdi-default
   0.0% (  0.2)   flush-8:0
   0.0% (  0.2)   rtkit-daemon
   0.0% (  0.1)   [kernel core] sk_reset_timer (tcp_delack_timer)
   0.0% (  0.1)   [kernel core] arm_supers_timer (sync_supers_timer_fn)
   0.0% (  0.1)   NetworkManager
   0.0% (  0.1)   rmmod
   0.0% (  0.1)   sshd
   0.0% (  0.1)   [kernel core] neigh_add_timer (neigh_timer_handler)
   0.0% (  0.1)   khungtaskd
   0.0% (  0.1)   [kernel core] add_timer (addrconf_verify)
   0.0% (  0.1)   events/1
   0.0% (  0.1)   ssh-agent
   0.0% (  0.1)   gnome-volume-ma
   0.0% (  0.1)   [kernel core] add_timer (sta_info_cleanup)
   0.0% (  0.1)   kerneloops
   0.0% (  0.1)   [kernel core] fib6_run_gc (fib6_gc_timer_cb)
   0.0% (  0.1)   rsyslogd

A USB device is active 100.0% of the time:
USB device  3-1 : BCM2045B (Broadcom Corp)

Suggestion: Enable USB autosuspend for non-input devices by pressing the
U key


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

Suggestion: Enable SATA ALPM link power management via: 
  echo min_power > /sys/class/scsi_host/host0/link_power_management_policy
or press the S key.

The program 'firefox-bin' is writing to file '_CACHE_001_' on /dev/sda1.
This prevents the disk from going to powersave mode.

The program 'firefox-bin' is writing to file '_CACHE_001_' on /dev/sda1.
This prevents the disk from going to powersave mode.

The program 'firefox-bin' is writing to file '_CACHE_001_' on /dev/sda1.
This prevents the disk from going to powersave mode.

The program 'firefox-bin' is writing to file 'sessionstore-1.js' on /dev/sda1.
This prevents the disk from going to powersave mode.

The program 'firefox-bin' is writing to file 'sessionstore-1.js' on /dev/sda1.
This prevents the disk from going to powersave mode.

Recent USB suspend statistics
Active  Device name
  0.0%	USB device  3-2 : Biometric Coprocessor (STMicroelectronics)
100.0%	USB device  3-1 : BCM2045B (Broadcom Corp)
  0.0%	USB device usb6 : UHCI Host Controller (Linux 2.6.32-14-generic uhci_hcd)
  0.0%	USB device usb5 : UHCI Host Controller (Linux 2.6.32-14-generic uhci_hcd)
  0.0%	USB device usb4 : UHCI Host Controller (Linux 2.6.32-14-generic uhci_hcd)
100.0%	USB device usb3 : UHCI Host Controller (Linux 2.6.32-14-generic uhci_hcd)
  0.0%	USB device usb2 : EHCI Host Controller (Linux 2.6.32-14-generic ehci_hcd)
  0.0%	USB device usb1 : EHCI Host Controller (Linux 2.6.32-14-generic ehci_hcd)

Recent audio activity statistics
Active  Device name
  0.0%	hwC0D0 Analog Devices AD1984 

Recent SATA AHCI link activity statistics
Active	Partial	Slumber	Device name

-- 
Tens of wakes per second in "[kernel scheduler] Load balancing tick" on Core 2 Duo with 1 core disabled in BIOS
https://bugs.launchpad.net/bugs/524281
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