[LinuxPPS] ntpd

[Udo van den Heuvel]

Folkert van Heusden wrote:
>>> I have a feeling that neither the atom nor the nmea ntpd driver use the
>>> PPS functionality.
>> About the nmea driver: read the docs, my dear friend:
>> http://www.eecis.udel.edu/~mills/ntp/html/drivers/driver20.html says:
>> If the Operating System supports the PPSAPI, RFC-2783, it will be used.
>> And how else can the NMEA driver reach such precision on my tiny
>> firewall when you got such bad performance with NMEA-only?
> 
> Please give me the output of ntpq -c pe.

You saw this times ago:

[root at epia files]# ntpq -c pe|head
     remote           refid      st t when poll reach   delay   offset
jitter
==============================================================================
 LOCAL(0)        .LOCL.          10 l   23   64  377    0.000    0.000
 0.002
*GPS_NMEA(0)     .GPS.            0 l   13   16  377    0.000    0.005
 0.004
-auth1.xs4all.nl 131.188.3.220    2 u  355 1024  377    7.862   -0.816
 8.515
-ntp0.nl.uu.net  .GPS.            1 u  610 1024  377   20.806    2.710
 3.636
-ntp1.nl.uu.net  .GPS.            1 u  601 1024  377   15.124    0.935
 7.299
-metasweb01.admi 162.23.3.170     3 u  469 1024  377   39.997    1.242
38.901
+ntps1-1.cs.tu-b .PPS.            1 u  620 1024  377   29.456    0.395
37.272
 ntp2-rz.rrze.un .STEP.          16 u    - 1024    0    0.000    0.000
 0.000