CPU usage

[Erik Englund <erik orebro telia com>]

Maybe this has been asked before but i had big problems finding out
anything on this...

My CPU is going up and down all the time. It's crazy, i don't do
anything and the curve in system monitor is like a roller coaster!

check this picture if you don't understand what i mean.
http://erikenglund.mine.nu/pics/cpu.jpg

If i look in the process listening tab there is nothing taking up any
big CPU amounts even though i have all processes listed!

If i quit all programs currently running (the one i see in gnome) the
curve goes down to a current 0-5% usage. And it's after i shut down the
"last" program when the cpu stops going up and down... No pattern as i
can see it :S

Thanks,
Erik