[ntp:questions] Re: Prefer Peer Plays Ping-Pong
Hal Murray
hmurray at suespammers.org
Fri Sep 15 19:58:59 UTC 2006
In article <450468C2.7050102 at febo.com>,
jra at febo.com (John Ackermann N8UR) writes:
>Sorry, couldn't resist the subject line...
>
>I am using a HP Z3801A GPS-disciplined oscillator with both the hpgps
>and atom drivers in order to use the PPS signal as well as the serial
>data stream.
>
>I'm finding that the system keeps switching sync sources, like so:
>
>10 Sep 15:11:41 ntpd[42461]: synchronized to PPS(0), stratum 0
>10 Sep 15:13:51 ntpd[42461]: synchronized to GPS_HP(0), stratum 0
>10 Sep 15:14:54 ntpd[42461]: synchronized to PPS(0), stratum 0
>10 Sep 15:15:58 ntpd[42461]: synchronized to GPS_HP(0), stratum 0
>10 Sep 15:17:03 ntpd[42461]: synchronized to PPS(0), stratum 0
>10 Sep 15:19:10 ntpd[42461]: synchronized to GPS_HP(0), stratum 0
>
>I suspect this may be due to the (relatively) much greater jitter on the
>serial data stream. Here's the current billboard from ntpq -p:
My system got a lot happier after I addded this line:
tos mindist 0.010
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