[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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