"unruh" <[email protected]> wrote in message
news:[email protected]...
[]
Question: would you expect the reported jitter to increase over the
first 30 minutes or so?
Could be somone switched on a vacuum cleaner for example.
No. I've seen something like this behaviour before, with the initial few
tens of minutes producing a more stable results than a full run.
That is now ntp works. All it knows is the current offset, and tries to
get rid of it by changing the frequency.
It does not know that there is a sudden step. I does not remember the
old offset values.
This behaviour seems wrong to me. Unless it's known that the frequency
can suddenly change, NTP should not be altering it in crash-bang steps, or
it should take a more long-term view before doing so.
You might look at the peerstats file and also look at the "roundtrip"
time. I might be that occasionally one of the paths from wireless to
computer gets shorter ( clearer signal?) and ntpd will then take that as
a good value, and an earlier value, and try to correct for that offset--
which it does by stepping the frequency.
I can imagine an occasional longer delay, but not a shorter one. I
haven't been collecting peerstats data. Signal strength is high and
unlikely to drop, although I accept that's not impossible.
Cheers,
David
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