dmesg: Losing some ticks... checking if CPU frequency changed

[Tero Hiekkalinna]

Hi,

I'm running FC4 on AMD Athlon 64 Dual Core 4800+ (ASUS A8N-SLI PREMIUM 
S939 NFORCE4, Kernel 2.6.13-1.1532_FC4smp) and I have this on systems logs:

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Losing some ticks... checking if CPU frequency changed.
warning: many lost ticks.
Your time source seems to be instable or some driver is hogging interupts
rip acpi_processor_idle+0x12f/0x37f

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What does that mean and should I be worried about it?

Thanks!

Best,
Tero