On 2011-12-24, David J Taylor <> wrote:
I suppose the answer to how the spikes arise could be simply "that's
how Wi-Fi is, with transmission uncertainties and the possibility of
interference. I had expected a greater variation to the offset with
Wi-Fi, but not the spikes. Perhaps NTP is sensitive because I have
minpoll 5 and maxpoll 5, perhaps widening the loop bandwidth?
Please remove the {min|max}poll and see if that makes a difference.
--
Steve Kostecke <[email protected]>
Steve,
The results of removing the min/max poll are here:
http://www.satsignal.eu/ntp/2011-12-16-Ystad.html
- the offset changed from near zero to a relatively large ~14 ms, and has
been decaying over the last ~34 hours to approach 8 ms.
- the frequency has become much more stable, although it's drifting from
an offset of +0.85 ppm towards +1.15 ppm. The stable value for that PC
when LAN connected was around +1.7 ppm. It looks to be aiming towards
that value, but it may take another few days to reach it.
- the jitter has increased from a range 1.2 - 3.8 ms to values ranging
from 2 to 20 ms.
So while allowing the poll interval to drift up to 1024 s has made for a
more stable frequency value, both offset and jitter are worse.
Cheers,
David
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