[ntp:questions] high precision tracking: trying to understand sudden jumps

Hal Murray hal-usenet at ip-64-139-1-69.sjc.megapath.net
Sun Mar 30 22:47:50 UTC 2008


>However once or twice a day, all the systems experience a
>random, uncorrelated time shift of from one to several
>milliseconds.

What does that mean?

I'm guessing that "uncorrelated" means the glitches don't happen
at the same time.

Are all clients seeing occasional problems?  Do they match
cron jobs or some activity burst on the system?

Can you try another network switch?  Or maybe even run without
any switches?  (plug the CDMA box directly into a second ethernet
port)

Can you try another NTP server?  How about setting up a PC,
letting it run for a day to establich a good drift file, and
then making it run on the local clock only.  That will drift,
slowly, but there won't be any jumps.

How about adding another client that doesn't do anything?
(Turn off cron too.)

-- 
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