[time-nuts] NTP on RaspberryPi

[Paul]

On Fri, May 24, 2013 at 8:14 PM
> From: Hal Murray
>> Besides I got them to run NTP and they're too jittery for my taste.
>
> How good/bad were they?
The view from the RPi*:
server (local      remote           refid      st t when poll reach   delay
  offset  jitter
============================================================================================
127.0.0.1     o127.127.22.0    .PPS.            0 l    -    8  377    0.000
  -0.001   0.003
192.168.0.192 *192.168.0.2     .PPS.            1 u    -    8  377    0.460
  -0.003   0.037
192.168.0.192 +192.168.0.210   .GPS.            1 u    7    8  377    0.920
  -0.019   0.202
192.168.0.192 +192.168.0.244   .PPS.            1 u    7    8  377    0.493
   0.022   0.031

The view from a mini-itx/Atom system:
server (local      remote           refid      st t when poll reach   delay
  offset  jitter
============================================================================================
127.0.0.1     o127.127.22.0    .PPS.            0 l    1    8  377    0.000
   0.000   0.002
192.168.0.244 +192.168.0.2     .PPS.            1 u    8    8  377    0.085
   0.004   0.002
192.168.0.244 +192.168.0.210   .GPS.            1 u    7    8  377    0.544
   0.001   0.216
192.168.0.244 *192.168.0.192   .PPS.            1 u    6    8  377    0.485
  -0.008   0.025

One odd system is enough.

> What were you using for a time source?  Does it have PPS support?

I have a variety of PPS sources.  The RPi is most often connected to a Sure
dev. board.
David Taylor linked to  Hauke Lampe who did a kernel build with PPS drivers.

*The tables look okay here but are probably trashed there.