[ntp:questions] NTP vs chrony comparison (Was: oscillations in ntp clock synchronization)

David L. Mills mills at udel.edu
Mon Jan 28 16:41:48 UTC 2008


We can argue about the Hurst parameter, which can't be truly random-walk 
as I have assumed, but the approximation is valid up to lag times of at 
least a week. However, as I have been cautioned, these plots are really 
sensitive to spectral lines due to nonuniform sampling. I was very 
careful to avoid such things.


David Malone wrote:

> Unruh <unruh-spam at physics.ubc.ca> writes:
>>weekends. Lots of power at 10^-5 Hz and harmonics, and .7 10^-8Hz.-- more
>>than would be predicted by 1/f
> 10^-5Hz is about once per day. I'm not sure what .7 10^8Hz is - it
> seems to be about once every 4.5 years? I would have assumed you'd
> get power around 10^-5Hz (daily), 10^-6 Hz (weekly) and maybe 3x10^-8
> (yearly) based on a mix of enviromental factors (air conditioning/heating)
> and usage?
> 	David.

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