[time-nuts] NTP on RaspberryPi

folkert folkert at vanheusden.com
Sun May 26 12:15:37 EDT 2013


> > Besides I got them to run NTP and they're too jittery for my taste. 
> 
> How good/bad were they?
> What were you using for a time source?  Does it have PPS support?

Here's ntpq -c pv for one of my RPIs after 25 days of uptime:

associd=0 status=0615 leap_none, sync_ntp, 1 event, clock_sync,
version="ntpd 4.2.6p5 at 1.2349-o Fri May 18 20:30:57 UTC 2012 (1)",
processor="armv6l", system="Linux/3.8.10+", leap=00, stratum=3,
precision=-20, rootdelay=25.184, rootdisp=73.646, refid=83.98.201.134,
reftime=d54cac1f.18aa9126  Sun, May 26 2013 17:43:27.096,
clock=d54cb273.b755933f  Sun, May 26 2013 18:10:27.716, peer=34195,
tc=10, mintc=3, offset=0.182, frequency=-47.006, sys_jitter=0.377,
clk_jitter=0.558, clk_wander=0.051

Hmmm found out that it syncs to random hosts on the internet.

Ok an other one which syncs against an other pc with PPS (and a few
others):

folkert at weerpi ~ $ ntpq -c rv
associd=0 status=0615 leap_none, sync_ntp, 1 event, clock_sync,
version="ntpd 4.2.6p5 at 1.2349-o Fri May 18 20:30:57 UTC 2012 (1)",
processor="armv6l", system="Linux/3.8.10+", leap=00, stratum=2,
precision=-20, rootdelay=0.807, rootdisp=7.669, refid=192.168.64.100,
reftime=d54cb1e1.9d6e8f07  Sun, May 26 2013 18:08:01.614,
clock=d54cb2e4.7d1cdae3  Sun, May 26 2013 18:12:20.488, peer=41936, tc=9,
mintc=3, offset=0.220, frequency=-31.405, sys_jitter=0.647,
clk_jitter=0.074, clk_wander=0.003

folkert at weerpi ~ $ uptime
 18:12:25 up 15 days,  3:48,  1 user,  load average: 0.12, 0.17, 0.15


Folkert van Heusden

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