Comment 4 for bug 524281
Revision history for this message
| Jeffrey Baker (jwbaker) wrote Re: Tens of wakes per second in "[kernel scheduler] Load balancing tick" on Core 2 Duo with 1 core disabled in BIOS | #4 |
# 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@pci:
2.3% ( 9.5) PS/2 keyboard/
1.0% ( 4.3) Xorg
1.0% ( 4.0) [kernel core] usb_hcd_
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_
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_
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_
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/
This wakes the disk up less frequently for background VM activity
Suggestion: Enable SATA ALPM link power management via:
echo min_power > /sys/class/
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 (STMicroelectro
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