[time-nuts] NTP on RaspberryPi

[Mark C. Stephens]

Wow I thought my offset/jitter specs were good!
Yours are outstanding.

I am using a HP thinclient (T150) with a 60Gb laptop drive shoehorned into it, just 10W to power it ;)
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
oGPS_NMEA(0)     .GPS.            0 l    5   16  377    0.000   0.002   0.002


-marki


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of Paul
Sent: Saturday, 25 May 2013 1:52 PM
To: time-nuts at febo.com
Subject: Re: [time-nuts] NTP on RaspberryPi

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.
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