[email protected] wrote:
OK. But at some point, when the drift file is established, it has a memory of sorts, right?
Not in the sense that unruh means. If you ignore the minimum delay filter, ntpd uses an IIR filter with only z^0 and z^1 terms, so it only remembers the state from one accepted sample back. Linear regression based system actively use values from several back samples in each iteration.
The drift file provides a checkpoint of part of the state, but is only used after an outage.
You can consider the minimum delay filter as using z^0 to z^7, but it ends up only selecting one of these, even though it uses all of them to make the decision.
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