Re: high precision tracking: trying to understand sudden jumps

Maarten Wiltink wrote:

You seem to be missing the point. Once the large errors have been
corrected, NTP goes on to the small errors. For that, it _needs_ a
longer poll interval. That this gives the server more air is a
happy coincidence, but not why it does it.

I don't believe it *needs* longer poll intervals; I think they are simply wasteful in that the offsets are low pass filtered in such a way that clamping maxpoll makes very little difference to the result, when the time constant goes high.

I'm not sure that there is any user configurable option that actually does what people think they are doing by locking down maxpoll, in terms of keeping the loop time constant low.

A clamped maxpoll may improve the reponsiveness to faults causing time steps of more than 128ms, but one should be attacking the problem, not the symptom.
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