high load, but also high idle

[Cornelius Kölbel <cornelius koelbel gmx de>]

Hello

I am running rh9.
I often get a high cpu load of over 5.

But the cpu state also says, that there is about 80 or 90 percent idle 
time...

So, if the processor got time - got nothing to do, why doesn´t the 
processer take the waiting processes to decrease the load.

I heard of this problem with some linux kernels.
But, what is the solution?

Regards
Cornelius