OS problem Centosx64 on BL25P

[kte at nexis.be]

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 
CentOS4.3 64 bit installed and I get alot of these messages.
I have installed the the PSP 7.51. Anyone any ideas?

Thanks Koen 
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