7

With :

Ubuntu Release 12.04 (precise) 64-bit
Kernel Linux 3.2.0-29-generic
Intel® Core™ i7-3635QM CPU @ 2.40GHz × 8

The first CPU is always at ~70%-100% with nothing big running and it is making the fan noisy. I am wondering if it is normal and if not, how can I fix this? enter image description here Thanks.

varnaud
  • 291
  • 1
    Click on Processes tab, then View > All Processes, and click on "% CPU", what are the top processes? – taneli May 01 '13 at 18:28
  • 1
    gnome-system-monitor; firefox; at-spi-bus-launcher; etc They all show 0 % CPU. – varnaud May 01 '13 at 18:40
  • Hmm, sorry, there is kworker/0:3 in top of all. It use 72%CPU. – varnaud May 01 '13 at 19:00
  • check what is running using the top command – GM-Script-Writer-62850 May 01 '13 at 19:22
  • Urgh, that is a bit complicated to figure out ... This sister site question has a relevant answer: http://unix.stackexchange.com/questions/22851/why-is-kworker-consuming-so-many-resources-on-linux-3-0-0-12-server/65270#65270 to figure out the exact culprit, but the short of it is that there's likely a misbehaving driver or hardware. Unless the system is supposed to be doing something heavy. – taneli May 01 '13 at 19:51
  • Shot in the dark: watch --interval=0.5 cat /proc/interrupts to see if an interrupt is hammering the system. – Kaz May 02 '13 at 04:03
  • Well, I installed Fedora 18, but I had the same issue. Sometime, CPU was at 70-100%, sometime it was normal. I followed this post : http://askubuntu.com/questions/176565/why-does-kworker-cpu-usage-get-so-high And the first solution seems to work for now. – varnaud May 14 '13 at 02:55

1 Answers1

6

I have done the things described in this post : Why does kworker cpu usage get so high? and it worked for me.

Community
  • 1
varnaud
  • 291