On 21/12/2012 09:55, David Taylor wrote:
I have two Raspberry Pi card computers both synced to GPS/PPS sources.
#1 is using a u-blox 6M "navigation" GPS, and #2 a Trimble resolution
SMT "timing" GPS. Every now and then (perhaps one day on ten?), the
"navigation" synced device develops spikes in the offset of about 8
microseconds in duration, as shown here:
Graphs for December 20:
http://www.satsignal.eu/ntp/Raspberry-Pi-NTP.html#oscillations
Current data:
http://www.satsignal.eu/mrtg/performance_ntp-pn.php
[]
Update: these oscillations appear to have been cured by a firmware
update on Raspberry Pi #1, from version 337601 to version 346337. The
graphs will take a time to update, reaching primary stability within an
hour or two. I will continue watching for any subsequent occurrence of
this problem.
--
Cheers,
David
Web: http://www.satsignal.eu
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