[time-nuts] NTP on RaspberryPi
Mark C. Stephens
marks at non-stop.com.au
Sat May 25 12:52:15 UTC 2013
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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