kworker high cpu

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kworker high cpu

Postby berezka » Tue Jul 24, 2012 3:40 am

I have installed LMDE Gnome2 64bit ( squeeze setup according ) on new HP workstation. One of two cores is permanently loaded over 80 %

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top | grep kworker
 4171 root      20   0     0    0    0 R   87  0.0   0:21.16 kworker/0:0

Kernel and xorg-server is updated to latest version from squeeze-backports:

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Linux berezka 3.2.0-0.bpo.2-amd64 #1 SMP Fri Jun 29 20:42:29 UTC 2012 x86_64 GNU/Linux

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dpkg -l | grep xorg
ii  xorg                                     1:7.6+8~bpo60+1                        X.Org X Window System
ii  xorg-docs-core                           1:1.5-1                                Core documentation for the X Window System
ii  xorg-sgml-doctools                       1:1.8-2~bpo60+1                        Common tools for building X.Org SGML documentation
ii  xserver-xorg                             1:7.6+8~bpo60+1                        X.Org X server
ii  xserver-xorg-core                        2:1.10.4-1~bpo60+1                     Xorg X server - core server
ii  xserver-xorg-input-all                   1:7.6+8~bpo60+1                        X.Org X server -- input driver metapackage
ii  xserver-xorg-input-evdev                 1:2.6.0-2~bpo60+1                      X.Org X server -- evdev input driver
ii  xserver-xorg-input-synaptics             1.4.1-1~bpo60+1                        Synaptics TouchPad driver for X.Org server
ii  xserver-xorg-input-wacom                 0.10.10+20110203-1~bpo60+1             X.Org X server -- Wacom input driver
ii  xserver-xorg-video-all                   1:7.6+8~bpo60+1                        X.Org X server -- output driver metapackage
ii  xserver-xorg-video-apm                   1:1.2.3-2~bpo60+1                      X.Org X server -- APM display driver
ii  xserver-xorg-video-ark                   1:0.7.3-2~bpo60+1                      X.Org X server -- ark display driver
ii  xserver-xorg-video-ati                   1:6.14.2-1~bpo60+1                     X.Org X server -- AMD/ATI display driver wrapper
ii  xserver-xorg-video-chips                 1:1.2.4-1~bpo60+1                      X.Org X server -- Chips display driver
ii  xserver-xorg-video-cirrus                1:1.3.2-4~bpo60+1                      X.Org X server -- Cirrus display driver
ii  xserver-xorg-video-fbdev                 1:0.4.2-4~bpo60+1                      X.Org X server -- fbdev display driver
ii  xserver-xorg-video-i128                  1:1.3.4-2~bpo60+1                      X.Org X server -- i128 display driver
ii  xserver-xorg-video-i740                  1:1.3.2-4~bpo60+1                      X.Org X server -- i740 display driver
ii  xserver-xorg-video-intel                 2:2.15.0-3~bpo60+2                     X.Org X server -- Intel i8xx, i9xx display driver
ii  xserver-xorg-video-mach64                6.9.0-1~bpo60+1                        X.Org X server -- ATI Mach64 display driver
ii  xserver-xorg-video-mga                   1:1.4.13.dfsg-3~bpo60+1                X.Org X server -- MGA display driver
ii  xserver-xorg-video-neomagic              1:1.2.5-2~bpo60+1                      X.Org X server -- Neomagic display driver
ii  xserver-xorg-video-nouveau               1:0.0.16+git20110411+8378443-1~bpo60+1 X.Org X server -- Nouveau display driver (experimental)
ii  xserver-xorg-video-openchrome            1:0.2.904+svn920-1~bpo60+1             X.Org X server -- VIA display driver
ii  xserver-xorg-video-r128                  6.8.1-5~bpo60+1                        X.Org X server -- ATI r128 display driver
ii  xserver-xorg-video-radeon                1:6.14.2-1~bpo60+1                     X.Org X server -- AMD/ATI Radeon display driver
ii  xserver-xorg-video-rendition             1:4.2.4-2~bpo60+1                      X.Org X server -- Rendition display driver
ii  xserver-xorg-video-s3                    1:0.6.3-4~bpo60+1                      X.Org X server -- legacy S3 display driver
ii  xserver-xorg-video-s3virge               1:1.10.4-4~bpo60+1                     X.Org X server -- S3 ViRGE display driver
ii  xserver-xorg-video-savage                1:2.3.2-3~bpo60+1                      X.Org X server -- Savage display driver
ii  xserver-xorg-video-siliconmotion         1:1.7.5-1~bpo60+1                      X.Org X server -- SiliconMotion display driver
ii  xserver-xorg-video-sis                   1:0.10.3-3~bpo60+1                     X.Org X server -- SiS display driver
ii  xserver-xorg-video-sisusb                1:0.9.4-2~bpo60+1                      X.Org X server -- SiS USB display driver
ii  xserver-xorg-video-tdfx                  1:1.4.3-4~bpo60+1                      X.Org X server -- tdfx display driver
ii  xserver-xorg-video-trident               1:1.3.4-2~bpo60+1                      X.Org X server -- Trident display driver
ii  xserver-xorg-video-tseng                 1:1.2.4-2~bpo60+1                      X.Org X server -- Tseng display driver
ii  xserver-xorg-video-vesa                  1:2.3.0-7~bpo60+1                      X.Org X server -- VESA display driver
ii  xserver-xorg-video-vmware                1:11.0.3-2~bpo60+1                     X.Org X server -- VMware display driver
ii  xserver-xorg-video-voodoo                1:1.2.4-2~bpo60+1                      X.Org X server -- Voodoo display driver

dpkg -l | grep mesa
ii  libgl1-mesa-dev                          7.10.3-4~bpo60+1                       free implementation of the OpenGL API -- GLX development files
ii  libgl1-mesa-dri                          7.10.3-4~bpo60+1                       free implementation of the OpenGL API -- DRI modules
ii  libgl1-mesa-glx                          7.10.3-4~bpo60+1                       free implementation of the OpenGL API -- GLX runtime
ii  libglu1-mesa                             7.10.3-4~bpo60+1                       Mesa OpenGL utility library (GLU)
ii  mesa-common-dev                          7.10.3-4~bpo60+1                       Developer documentation for Mesa
ii  mesa-utils                               7.7.1-5                                Miscellaneous Mesa GL utilities

I have googled and tried several solutions.

1. I have added in /etc/modprobe.d/local.conf :
options drm_kms_helper poll=N - did not work for me

2. I have added to /etc/default/grub option : acpi=off.
This action was helpful. The problem is that X can’t start with intel driver (vesa only) and vesa don’t support resolution 1920x1080.

System configuration:

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inxi -F
System:    Host berezka Kernel 3.2.0-0.bpo.2-amd64 x86_64 (64 bit) Distro Linux Mint Debian Edition
CPU:       Dual core Intel Pentium G850 (-MCP-) cache 3072 KB flags (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips 11571.3
           Clock Speeds: (1) 2892.838 MHz (2) 2892.838 MHz
Graphics:  Card Intel Sandy Bridge Integrated Graphics Controller X.Org 1.10.4 Res: 1920x1080@60.0hz
           GLX Renderer Mesa DRI Intel Sandybridge Desktop   GLX Version 2.1 Mesa 7.10.3 Direct Rendering Yes
Audio:     Card Intel Cougar Point High Definition Audio Controller driver snd_hda_intel BusID: 00:1b.0
           Sound: Advanced Linux Sound Architecture Version 1.0.24
Network:   Card Intel 82579LM Gigabit Network Connection driver e1000e v: 1.5.1-k at port f080 BusID: 00:19.0
Disks:     HDD Total Size: 500.1GB (7.6% used) 1: /dev/sda WDC_WD5000AAKX 500.1GB
Partition: ID:/ size: 64G used: 6.7G (11%) fs: ext4 ID:/boot size: 1021M used: 81M (9%) fs: ext4
           ID:/home size: 393G used: 29G (8%) fs: ext4 ID:swap-1 size: 8.59GB used: 0.00GB (0%) fs: swap
Info:      Processes 154 Uptime 1:24 Memory 923.3/3854.7MB Runlevel 3 Client Shell inxi 1.4.23

Maybe I have missed something and you have another solutions for this problem? or should I report about this bug somewhere?

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Re: kworker high cpu

Postby berezka » Thu Jul 26, 2012 10:47 am

Update of bios fixed the problem. Topic can be closed

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Re: kworker high cpu

Postby revdjenk » Sat Nov 10, 2012 12:12 pm


Can you tell me the 'howto' of this bios update, please? I was affected by this kworker bug a year ago, and it has re-appeared. I tried the same fix that worked for me last time the first one on your list) but it had no affect.
I then installed the phc-intel ppa found in an ubuntu forum ( ... ng-100-cpu) which is currently working for me.
I am beginning to see kworker mentioned more and more in hoggin cpu time, but not seeing any fix coming from bug reports/patches, yet.

Malachi 3:10 NRSV
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Linux user since 2001 pda; 2006 lappy

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