OS problem RedHatx64 on BL25P

[Nexis]

Jun 2 03:18:40 testserver Losing some ticks... checking if CPU frequency changed.
Jun 2 03:18:40 testserver warning: many lost ticks.
Jun 2 03:18:40 testserver Your time source seems to be instable or some driver is hogging interupts

I have an HP BL25P server with 4 GB ram a dual core AMD processor an RedHat4.3 64 bit installed and I get alot of these messages.
I have installed the the PSP 7.51. Anyone any ideas?

Thanks Koen

[ScalixSupport]

What does RedHat say?

Thanks,
Don