On 16 December 2013 13:16, Adrian P <[email protected]> wrote: > Hi, > > In an old IBM thinkpad T22 laptop that runs FreeBSD 9.2, I have > configured a NTP server that gets the PPS signal from a Garmin GPS 18 > LVC, as described here: > http://www.satsignal.eu/ntp/FreeBSD-GPS-PPS.htm > > The /etc/ntp.conf contains the following generic NMEA GPS receiver > driver configuration: > > server 127.127.20.0 mode 1 minpoll 4 maxpoll 4 prefer > fudge 127.127.20.0 flag1 1 flag2 0 flag3 1 refid PPS > > I let it run for a few days, however I still have every now and then > huge peaks (between -50 and +30 us) of the clock offset as seen in the > following graph: http://goo.gl/JpSyeO > > So I am wondering: why those repeating huge clock offsets? They > allays starts with a negative peak, followed immediately by a positive > one. Is this because of the faulty laptop internal clock, that drifts > away with 30-40 us every now and then? Any thoughts? > > Many thanks, > Adrian
Thanks for all your help. Unfortunately the hard drive in my old T22 laptop failed this evening, after couple of days running without interruption. So I will come back to this when I have it back up and running, hopefully by the end of this week. Many thanks again, Adrian _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
