[time-nuts] ntpq output
David J Taylor
david-taylor at blueyonder.co.uk
Mon Jan 23 09:00:24 UTC 2012
> The following is a few ntpq -p outputs. Just random samples over a week.
> I seem to periodically have large offset.
>
> I'm open to suggest how to improve this if the numbers don't look
> normal.
>
> Please trim the raw data to keep the size of any replies as small as
> possible.
>
>> remote refid st t when poll reach delay offset
>> jitter
[]
>> +235-69-67-68.st 130.159.196.117 3 u 190 1024 377 88.459 -7.813
>> 4.419
>> *cheezum.mattnor 129.7.1.66 2 u 614 1024 377 63.319 -2.871
>> 4.571
>> +rigel.jeffkapla 69.164.222.108 3 u 90 1024 377 88.959 -5.622
>> 1.890
>> +w1-wdc.ipv4.got 10.0.77.54 4 u 86 1024 377 91.660 -5.236
>> 3.399
Your delays look awful. I would hope for 15-30 ms over the Internet.
Either you have a poor connection, or your servers are a continent away.
Can you find servers nearer (in network terms) to you? Have you tried the
pool servers for your region? If you can't improve the delays, you
/might/ get an improvement by polling more frequently, setting maxpoll=9
for example - making the maximum interval 2^9 i.e. 512 seconds.
The obvious improvement is to get a startum-1 server yourself, which may
not cost the earth - perhaps US $30-50 if you have somewhere with a 50%
sky view. I have notes about the Garmin GPS 18x LVC and Sure GPS board on
my NTP page:
http://www.satsignal.eu/ntp/index.html
Cheers,
David
--
SatSignal software - quality software written to your requirements
Web: http://www.satsignal.eu
Email: david-taylor at blueyonder.co.uk
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