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Date: Sat, 08 May 2010 15:25:51 +1000
From: Nigel Cunningham <ncunningham@...a.org.au>
To: LKML <linux-kernel@...r.kernel.org>
Subject: 2.6.33 & 2.6.34-rc6: Huge number of Load Balancing tick wakeups.
Hi all.
I'm seeing a huge number of load balancing tick wakeups, with both
2.6.33 and current git (f1c448e0a9e99c76f4ece368714fb35a40a8daba).
This has been reported as a bug in some distros:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=521944
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/524281
Regards,
Nigel
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 C4
Cn Avg residency
C0 (cpu running) (40.8%)
polling 0.7ms ( 0.1%)
C1 mwait 0.0ms ( 0.0%)
C2 mwait 0.1ms ( 3.2%)
C4 mwait 0.4ms (56.0%)
P-states (frequencies)
Turbo Mode 7.3%
2.21 Ghz 0.7%
1.60 Ghz 0.8%
1200 Mhz 0.9%
800 Mhz 90.3%
Wakeups-from-idle per second : 1727.3 interval: 15.0s
no ACPI power usage estimate available
Top causes for wakeups:
53.0% (1983.1) [kernel scheduler] Load balancing tick
27.7% (1035.1) vmware-vmx
8.8% (330.6) [extra timer interrupt]
2.3% ( 85.5) [TLB shootdowns] <kernel IPI>
1.6% ( 61.3) totem
1.2% ( 45.9) [Rescheduling interrupts] <kernel IPI>
1.1% ( 41.1) [iwl3945] <interrupt>
1.0% ( 36.2) firefox-bin
0.4% ( 16.2) [ata_piix] <interrupt>
0.3% ( 11.6) vmware
0.3% ( 11.3) pulseaudio
0.3% ( 11.1) vmware-unity-he
0.3% ( 10.7) skype
0.2% ( 8.0) [kernel core] usb_hcd_poll_rh_status (rh_timer_func)
0.1% ( 5.4) [hda_intel] <interrupt>
0.1% ( 5.3) gnome-do
0.1% ( 5.1) compiz
0.1% ( 4.1) python
0.1% ( 4.0) avant-window-na
0.1% ( 2.3) liferea
0.1% ( 2.1) vmware-tray
0.1% ( 2.1) thunderbird-bin
0.1% ( 2.0) mysqld
0.1% ( 2.0) emerald
0.1% ( 1.9) gnome-terminal
0.0% ( 1.3) [kernel core] sk_reset_timer (tcp_delack_timer)
0.0% ( 1.3) [ahci] <interrupt>
0.0% ( 1.2) cc1
0.0% ( 1.0) [nvidia] <interrupt>
0.0% ( 1.0) vmware-usbarbit
0.0% ( 1.0) vmnet-natd
0.0% ( 1.0) gvfs-afc-volume
0.0% ( 1.0) [kernel core] enqueue_task_rt (sched_rt_period_timer)
0.0% ( 1.0) [kernel module] HostIF_InitUptime
(HostIFUptimeResyncMono)
0.0% ( 0.8) cli
0.0% ( 0.5) events/1
0.0% ( 0.5) events/0
0.0% ( 1.0) vmware-usbarbit
0.0% ( 1.0) vmnet-natd
0.0% ( 1.0) gvfs-afc-volume
0.0% ( 1.0) [kernel core] enqueue_task_rt (sched_rt_period_timer)
0.0% ( 1.0) [kernel module] HostIF_InitUptime
(HostIFUptimeResyncMono)
0.0% ( 0.8) cli
0.0% ( 0.5) events/1
0.0% ( 0.5) events/0
0.0% ( 0.5) hald-addon-stor
0.0% ( 0.5) udisks-daemon
0.0% ( 0.3) tomboy
0.0% ( 0.3) awn-applet
0.0% ( 0.2) rtkit-daemon
0.0% ( 0.2) Thunar
0.0% ( 0.2) padevchooser
0.0% ( 0.2) xfdesktop
0.0% ( 0.1) gnome-power-man
0.0% ( 0.1) ssh-agent
0.0% ( 0.1) mono
0.0% ( 0.1) NetworkManager
0.0% ( 0.1) hald
An audio device is active 100.0% of the time:
hwC0D2 SigmaTel STAC9228
A USB device is active 0.0% of the time:
USB device 2-2 : Biometric Coprocessor (STMicroelectronics)
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.
Suggestion: Enable wireless power saving mode by executing the following
command:
iwconfig wlan0 power timeout 500ms
This will sacrifice network performance slightly to save power.
Suggestion: Enable the CONFIG_USB_SUSPEND kernel configuration option.
This option will automatically disable UHCI USB when not in use, and may
save approximately 1 Watt of power.
Recent USB suspend statistics
Active Device name
0.0% USB device 5-2 : Generic RNDIS (HTC)
0.0% USB device 2-2 : Biometric Coprocessor (STMicroelectronics)
0.0% USB device 1-1 : Laptop Integrated Webcam (OmniVision
Technologies, Inc. -2640-07.07.20.3)
0.0% USB device usb7 : UHCI Host Controller (Linux 2.6.34-rc6 uhci_hcd)
0.0% USB device usb6 : UHCI Host Controller (Linux 2.6.34-rc6 uhci_hcd)
0.0% USB device usb5 : UHCI Host Controller (Linux 2.6.34-rc6 uhci_hcd)
0.0% USB device usb4 : EHCI Host Controller (Linux 2.6.34-rc6 ehci_hcd)
0.0% USB device usb3 : UHCI Host Controller (Linux 2.6.34-rc6 uhci_hcd)
0.0% USB device usb2 : UHCI Host Controller (Linux 2.6.34-rc6 uhci_hcd)
0.0% USB device usb1 : EHCI Host Controller (Linux 2.6.34-rc6 ehci_hcd)
Recent audio activity statistics
Active Device name
100.0% hwC0D2 SigmaTel STAC9228
Recent SATA AHCI link activity statistics
Active Partial Slumber Device name
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