** Changed in: linux-2.6 (Debian) Status: Incomplete => Fix Released
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/524281 Title: Tens of wakes per second in "[kernel scheduler] Load balancing tick" on Core 2 Duo even with only 1 core enabled Status in “linux” package in Ubuntu: Fix Released Status in “xorg” package in Ubuntu: Invalid Status in Arch Linux: New Status in “linux-2.6” package in Debian: Fix Released Bug description: powertop reports many wakes per second (quantity depending on system) in "[kernel scheduler] Load balancing tick" task, rising with little load, on many kinds of multi-core (?) systems (original report was on a Core 2 Duo processor (T6500) with a single core enabled (multicore disabled in BIOS)). Cause of the problem: With kernel 2.6.32, there came a patch to the scheduler that introduced this problem (that was backported to some other versions as well). Even though this problem occurred first in Lucid, it is NOT specific to Lucid or Ubuntu at all (Debian bug report at http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=521944, reproducable in Arch Linux as well). Work is ongoing to get things straight in kernel, but it will take a long time until this reaches Ubuntu (see http://lkml.org/lkml/2010/7/6/172). Workarounds that DO NOT work (may improve situation but not solve it): - maxcpus=1 - noapic - nosmp - nolapic - use mainline kernel Workarounds that DO (probably) work: - tip version of kernel (git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git, from http://lkml.org/lkml/2010/7/8/75) - use maverick's kernel with applied patches (https://launchpad.net/~brian-rogers/+archive/power, from comment #80) ProblemType: Bug AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21. Architecture: i386 ArecordDevices: **** List of CAPTURE Hardware Devices **** card 0: Intel [HDA Intel], device 0: ALC269 Analog [ALC269 Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: etrusco 1606 F.... pulseaudio etrusco 15151 F.... foobar2000.exe CRDA: Error: [Errno 2] No such file or directory Card0.Amixer.info: Card hw:0 'Intel'/'HDA Intel at 0xfddf8000 irq 22' Mixer name : 'Realtek ALC269' Components : 'HDA:10ec0269,1b0a4009,00100004 HDA:11c11040,1b0a4007,00100200' Controls : 19 Simple ctrls : 11 Card1.Amixer.info: Card hw:1 'HDMI'/'HDA ATI HDMI at 0xfebec000 irq 17' Mixer name : 'ATI R6xx HDMI' Components : 'HDA:1002aa01,00aa0100,00100100' Controls : 4 Simple ctrls : 1 Card1.Amixer.values: Simple mixer control 'IEC958',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [on] Date: Fri Feb 19 05:25:42 2010 DistroRelease: Ubuntu 10.04 EcryptfsInUse: Yes MachineType: Philco PHN10XXX. Package: linux-image-2.6.32-13-generic 2.6.32-13.18 ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-13-generic root=UUID=d482e94f-9370-4ad2-9536-986541003db5 ro acpi.power_nocheck=1 acpi_osi=linux radeon.blacklist=yes ProcEnviron: LANG=en_US.UTF-8 SHELL=/bin/bash ProcVersionSignature: Ubuntu 2.6.32-13.18-generic Regression: No RelatedPackageVersions: linux-firmware 1.29 Reproducible: Yes RfKill: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no SourcePackage: linux TestedUpstream: No Uname: Linux 2.6.32-13-generic i686 dmi.bios.date: 06/01/2009 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 1.01 dmi.board.asset.tag: To Be Filled By O.E.M. dmi.board.vendor: PEGATRON CORP. dmi.board.version: To be filled by O.E.M. dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 10 dmi.chassis.vendor: PEGATRON CORP. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1.01:bd06/01/2009:svnPhilco:pnPHN10XXX.:pvr1.01:rvnPEGATRONCORP.:rn:rvrTobefilledbyO.E.M.:cvnPEGATRONCORP.:ct10:cvrToBeFilledByO.E.M.: dmi.product.name: PHN10XXX. dmi.product.version: 1.01 dmi.sys.vendor: Philco To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/524281/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp