CPU usage always above 60%

hi, the system monitors always indicate a large cpu usage with peaks at almost 100% even when no applications run and nothing happens. Things are then a little slow and delayed at times and applications like openoffice crash on a regular basis.
Processes with no name from user:“root,-1” and using an “unknown” amount of cpu keep popping up in the list. What are they?

Ho do I do to diagnose correctly the problem(s)? Any methods for somebody a little pedestrian?


PS: I have definitely messed up with KDE4 once trying to disable some fancy stuff and possibly when resolving a lot of dependencies to install the latest version of Inkscape.


I assume you are using the KDE task manager. Do you see different information when you use top on the command line?


yes it is somewhat different. Comparing both outputs, Xorg and Ksysguard are mostly at the top with usage oscillating between 5-10% then usually avahi-daemon. Then the ~130 following processes come up in very different order but seem to be consuming (almost) nothing.
The processes from user root,-1 with unknown usage do not appear. But the memory usage seem a lot higher than as indicated in the kde system monitor. There cpu usage oscillate now around 70% and memory around 500MB.
I only have firexox, konsole, and system monitor opened.

Here is the output of top (sorry a bit messy…)

top - 15:20:58 up 4:25, 3 users, load average: 2.09, 1.80, 1.73
Tasks: 138 total, 4 running, 134 sleeping, 0 stopped, 0 zombie
Cpu(s): 36.9% us, 25.2% sy, 0.0% ni, 34.2% id, 3.1% wa, 0.2% hi, 0.3% si, 0.0% st
Mem: 2045236k total, 1660220k used, 385016k free, 183812k buffers
Swap: 1052216k total, 0k used, 1052216k free, 1134112k cached

20345 ynk1 20 0 87424 23m 17m S 16 1.2 1:24.58 ksysguard
10375 root 20 0 3072 1488 1144 R 8 0.1 0:00.06 ifup
2685 root 20 0 426m 55m 5232 S ** 6** 2.8 23:30.23 Xorg
10379 ynk1 20 0 2412 912 680 R 4 0.0 0:00.02 top
3836 avahi 20 0 6828 5424 1336 S 2 0.3 2:20.33 avahi-daemon
1 root 20 0 1008 356 308 S 0 0.0 0:01.28 init
2 root 15 -5 0 0 0 S 0 0.0 0:00.00 kthreadd
3 root RT -5 0 0 0 S 0 0.0 0:09.60 migration/0

I do not see any obvious reasons… so I dont known where/how to look. Any suggestions are welcome.
Thanks in advance

The quick and dirty solution would probably be to delete KDE all together and reinstall it.

No, don’t delete it. Select the repo view in the software manager, select the KDE4 repo’s one by one, and click ‘Switch system packages to …’. That reinstalls KDE4 with all packages coming from one repo. Should do the job, and save a lot of dep. misery.

Please note, that you did this yourself. High CPU usage by ksysguard usually points to a mix of packages from different repos, for example 4.3.1 from install mixed with 4.3.3 from a repo.

Sorry Knurpht, This all sounds good to me and I am sure this is my level, but I need just little clarifications…

Do you mean:
YaST > Software management > filter: Repositories
YaST > Software Repositories

I am not sure I understand… :frowning:
Do you mean repositories or package…

Either way I do not see such button or option.

Thanks a lot for taking the time,

PS: question, if want to use some applications (eg. Kile for latex) for which the latest stable version depends on kde3 packages, I am not bound to have conflicts between kde versions as you suggested? or is it ok as long as I use packages from the same repository?