Refclock quirk

[Eric S. Raymond]

Hal Murray <hmurray at megapathdsl.net>:
> 
> I'm seeing things like this:
>      remote           refid      st t when poll reach   delay   offset  jitter
> ==============================================================================
> +fe80::21e:c9ff: .PPS.            1 u   86 1024  377    0.483   -3.643   0.330
> +fe80::226:2dff: .PPS.            1 u  758 1024  377    0.582   -3.652   0.392
> +fe80::226:2dff: 192.168.1.33     2 u  802 1024  377    0.591   -3.632   0.362
> *GPS_NMEA(0)     .GPS.            0 l   21   64  377    0.000   74.403   5.791
> oPPS(0)          .PPS.            0 l   84 1024  377    0.000   -3.750   0.332
> +glypnod         .PPS.            1 u   45   64  377    0.361   -3.683   0.012
> +shuksan         .PPS.            1 u   60   64  377    0.313   -3.656   0.021
> +mon             .PPS.            1 u   39   64  377    0.552   -3.801   0.034
> +tom             .PPS.            1 u   31   64  377    0.506   -3.770   0.037
> +cent            .PPS.            1 u   31   64  377    0.442   -3.729   0.014
> 
> That's on a raspberry Pi with a GPS HAT.  The glitch is the 1024 polling 
> interval for the PPS.  That shouldn't be there.  Note that the NMEA driver is 
> at 64.
> 
> I don't remember seeing anything like that before your recent refclock 
> changes.

Hm.

ntpq> peers
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
 SHM(0)          .GPS.            0 l    -   64    0    0.000    0.000   0.000
 SHM(1)          .PPS.            0 l    -   64    0    0.000    0.000   0.000
+space.aja.com   198.169.208.144  2 u  216 1024  377   81.515    3.028   1.134
-time.aja.com    198.169.208.144  2 u  333 1024  377   79.555    4.001   0.603
+ntp.newfxlabs.c 128.9.176.30     2 u  547 1024  377   71.544   -1.200   0.665
*li290-38.member 128.138.141.172  2 u  357 1024  377   44.675   -0.953   0.429
-golem.canonical 140.203.204.77   2 u 1048 1024  377   89.415    7.883   2.001

I've never seen that before.

Looking at one of my Pis,

esr at snark:~/software/ntp-rescue/ntpsec$ ntpq -p au.local
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
-SHM(0)          .GPS.            0 l   31   64  377    0.000  -136.51   2.011
*SHM(1)          .PPS.            0 l   31   64  377    0.000   -0.003   0.004
-soft-sea-01.ser 209.51.161.238   2 u   43   64  377   73.995   -3.330   1.075
+ec2-54-236-224- 131.107.13.100   2 u   11   64  377   11.053    1.215   1.306
-gw-kila-wl0.ipv 216.218.254.202  2 u    -   64  377   82.685    1.228   0.819
+vimo.dorui.net  209.51.161.238   2 u   27   64  377   11.921    1.254   0.959

That looks normal.

I'll investigate.
-- 
		<a href="http://www.catb.org/~esr/">Eric S. Raymond</a>