[ntp:questions] Keeping NTP Honest Redux

Unruh unruh-spam at physics.ubc.ca
Tue Nov 10 14:43:35 UTC 2009

David Woolley <david at ex.djwhome.demon.invalid> writes:

>Unruh wrote:

>> Well, you do have that choice, only in different names. chrony uses an entirely
>> different algorithm (directly estimating the rate and the offset from a sequence

>Looking at the graphs, one needs the first derivative of the rate, as well.

Why? If you want the details of how chrony works, I could supply it, but it uses
a linear fit, with adaptive determinatikon of how long a supply of data points to
use to make sure that a linear fit is still appropriate.
ntp uses only the instantaneous value of the offset, with no memory.

>> of measurments). Of course you do not have that choice under Windows ( but
>> perhaps someone could port chrony to windows). There are also other places where
>> they are not equivalent, but it is at least an option.

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