[ntp:questions] Loopstats jitter field mostly zero?
David Taylor
david-taylor at blueyonder.co.uk.invalid
Mon Dec 3 12:49:37 UTC 2012
On 27/11/2012 07:05, james machado wrote:
[]
> on my RPi running as at stratum 1
>
> # ntpq -c "rv 0 version" 127.0.0.1
> version="ntpd 4.2.6p3 at 1.2290 Thu Oct 25 04:18:47 UTC 2012 (1)"
>
> # uname -a
> Linux pisces 3.6.1+ #1 Fri Nov 2 02:10:35 PDT 2012 armv6l GNU/Linux
>
> # ntpq -c lpeers
> remote refid st t when poll reach delay offset jitter
> ==============================================================================
> *GPS_NMEA(0) .GPS. 0 l - 8 377 0.000 -114.47 45.790
> oPPS(0) .PPS. 0 l 2 16 377 0.000 0.002 0.002
> -64.147.116.229 .ACTS. 1 u 9 64 377 37.443 13.267 0.804
> +nist1-lv.ustimi .ACTS. 1 u 37 64 377 47.102 -8.095 0.815
> +nist1-sj.ustimi .ACTS. 1 u 57 64 377 53.926 -0.576 0.764
> -pool-test.ntp.o 216.218.254.202 2 u - 64 377 35.388 -3.495 2.444
> -four10.gac.edu 18.26.4.105 2 u 8 64 377 78.181 4.795 0.660
> -ntp1.csl.tjhsst 192.5.41.41 2 u 37 64 337 91.164 8.840 0.491
> -tick.tadatv.com 10.0.22.51 2 u 15 64 377 47.252 3.167 4.509
>
>
> here is a typical view of my loopstats
> # tail /var/log/ntpstats/loopstats
> 56258 24418.148 0.000001454 22.907 0.000000000 0.000375 4
> 56258 24434.148 0.000001005 22.908 0.000000000 0.000363 4
> 56258 24450.148 -0.000002531 22.907 0.000000000 0.000405 4
> 56258 24466.148 -0.000001953 22.907 0.000000000 0.000414 4
> 56258 24482.148 0.000000905 22.907 0.000000000 0.000395 4
> 56258 24498.148 -0.000002061 22.906 0.000000000 0.000410 4
> 56258 24514.148 -0.000002068 22.906 0.000000000 0.000423 4
> 56258 24530.148 0.000001085 22.906 0.000000000 0.000407 4
> 56258 24546.148 -0.000001675 22.906 0.000000000 0.000408 4
> 56258 24562.148 -0.000002359 22.905 0.000000000 0.000433 4
>
> i checked my loopstats for the last 47,000 odd lines of loopstats I
> have had 7 lines where the jitter has not been zero.
>
> james
Two of us see this problem - any suggestions about how to progress it
(perhaps buy Dave Hart a Raspberry Pi? <G>).
--
Thanks,
David
Web: http://www.satsignal.eu
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