[ntp:questions] NTP 128ms

Brian Inglis Brian.Inglis at Shaw.ca
Mon Oct 10 15:53:48 UTC 2016

On 2016-10-06 17:35, brian utterback wrote:
> The maximum adjustment allowed by default is 17 minutes. If you control
> enough of the system's upstream servers you can set the clock to
> anything you want eventually. The only question is how fast you can do it.

Default 1000s maximum step is 0:16:40.
Default maximum rate is 500ppm == 500us/s == 1s/2000s == 128ms/256s.

You can tinker with these at your peril:


Some of these have dependencies which can have drastic effects on stability of
the discipline algorithms and operation of the service: adjusting these should
constitute part of a research project into controls.
If you change one or more of these, something breaks, and you ask about it,
you will most likely be told: don't do that!

Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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