[ntp:questions] Strange jumps in PPM

A C agcarver+ntp at acarver.net
Fri Aug 23 00:37:01 UTC 2013


On 8/22/2013 11:06, unruh wrote:

> What I said was that it is obvioius to you, after the fact, and with the
> knowledge you have of your system, that the source is the problem. But
> ntpd is an extremely stupid program, in that it has virtually no memory
> and must base its decisions on the latest measurement of the offset
> only. Thus a sudden change in the is taken to mean either a change in
> the source, or a change in the measurement of the source. In case it is
> the latter, it changes the computer time only slowly, assuming that
> measurement errors will average out if you make the change slowly
> enough.

Right, I know what you said.  I'm replying that it would be great if 
ntpd had a mechanism by which I could give it information that I know 
about the system so it can make a much more informed decision about a 
reference clock.



More information about the questions mailing list