Hello everyone, I've noticed something I find very strange on the systems I have to work with. Every time I reboot the computer, the clock skew of the local clock changes, sometimes by what seems to be a huge amount.
For example, I boot the computer, let ntpd run for 12 hours, and the value recorded in the drift file is 35 ppm. I reboot the computer, let ntpd run for 12 hours, and I get 5 ppm... The temperature in the room did not change much. Could the operating system (Linux 2.6.20.3-rt8) be responsible for this? Could the motherboard supply a different voltage every time I reboot the system? How much is the system clock in a PC affected by temperature? I've read 2 ppm per °C, or was it 0.5 ppm per °C? How much is it affected by voltage? What other parameters have an influence? When I say "system clock" I think that, on this system, Linux uses the PIT on the motherboard, but I'm not 100% sure. Regards. _______________________________________________ questions mailing list [email protected] https://lists.ntp.isc.org/mailman/listinfo/questions
