On 07/04/2013 11:14, Paul J R wrote:
Hi All,
I've got a SiRF star 3 GPS with a PPS line which im trying to get
running on a machine with ubuntu 12.10 and a serial port using the DCD
line for pps signalling.
[]
o127.127.20.0 .GPS. 0 l 4 8 377 0.000 -0.065
0.003
[]
Seems like a pretty decent little gps unit, assuming i've got it
functioning and configured correctly?
Just for comparison:
Intel Atom PC running FreeBSD 8.2 (Pixie):
o127.127.20.1 .PPS. offset/jitter -0.001 0.002
Two Raspberry Pis running Linux 3.2.27+
o127.127.22.0 .PPS. offset/jitter 0.002 0.002
o127.127.22.0 .PPS. offset/jitter 0.001 0.002
Raspberry Pi running Linux 3.36.11
o127.127.22.0 .PPS. offset/jitter 0.000 0.002
65 microseconds offset seems a little high to me, but the PCs I've just
quoted are all (mostly) /only/ serving NTP. I have been doing a little
installation work on Raspberry Pi #3 today, and it now has a steady CPU
and network I/O load. Its PPS was only configured yesterday.
Performance graphs are here:
http://www.satsignal.eu/mrtg/performance_ntp.php
I hope that helps your comparisons.
--
Cheers,
David
Web: http://www.satsignal.eu
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