Ron Frazier (NTP) wrote:
It is my understanding that NTP is continuously making small changes to the software clock to keep the timing accurate while the os is running. 95% of the time, my computers are doing the same thing and 95% of the time, I'm doing the same thing with the computers. Therefore, over a long time interval, the interrupt usage should be similar, and over a long time interval, the correct clock frequency to maintain accuracy should be similar.
Although interrupt related issues can cause temporary changes in measured offset, which will self correct, the main issue is temperature changes, changing the actual clock frequency and also power management doing that. If you can address temperature changes by other means (ovened crystal, etc.) and can avoid power management, you should not need to make step corrections, and, on Linux, you can use ntptime to tune the kernel time discipline parameters to find tune a fixed frequency correction.
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