[time-nuts] Testing frequency using NTP
Steve Rooke
sar10538 at gmail.com
Thu Oct 2 01:49:28 EDT 2008
Your results are considerably better than mine but these are just off
my busy workstation taken as a snapshot. I have no local time standard
so dependant on the external servers. Perhaps I could do better on a
dedicated system running a RT Linux:-
ntpdc> peers
remote local st poll reach delay offset disp
=======================================================================
=LOCAL(0) 127.0.0.1 10 64 377 0.00000 0.000000 0.03079
=infinite-loop.n 192.168.0.2 2 1024 377 0.08951 0.010470 0.13661
*gen2.ihug.co.nz 192.168.0.2 2 1024 377 0.06548 0.008092 0.13657
=mu-relay2.masse 192.168.0.2 2 1024 377 0.10503 0.003384 0.13667
=ns2.compass.net 192.168.0.2 2 1024 377 0.06645 -0.007766 0.12173
ntpdc>
Over a long sampling time though, these errors should factor out to be
very small anyway.
Cheers,
Steve
2008/10/2 Björn Gabrielsson <bg at lysator.liu.se>:
> You do not have to chose a bad NTP server. With better servers you can
> gain a few orders of magnitude.
>
> $ ntpq -p timehost.lysator.liu.se
>
> remote refid st ... delay offset jitter
> ================================================================
> *GENERIC(0) .GPS. 0 ... 0.000 0.014 0.002
> +nissan.ifm.liu. .PPS. 1 ... 0.651 0.000 0.035
> +ntp1.sth.netnod .PPS. 1 ... 3.667 -0.018 0.052
> +ntp2.gbg.netnod .PPS. 1 ... 10.967 -0.010 0.014
> -ntp1.mmo.netnod .PPS. 1 ... 13.899 -0.077 0.061
>
> Also look at the NTP temperature compensation discussion at
>
> http://www.ijs.si/time/temp-compensation/
>
>
> --
>
> Björn
>
>
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--
Steve Rooke - ZL3TUV & G8KVD
Omnium finis imminet
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