On 11/16/2011 12:47 AM, A C wrote:
Is there a way to configure ntpd to ignore a particular clock unless
there is no other choice? What I'm thinking is to ignore the GPS
receiver NMEA data and use only the PPS plus Internet servers for most
of the synchronization. But if the Internet servers go down, accept the
GPS NMEA data for seconds numbering and let the tick be controlled by PPS.
I guess I'm asking for something opposite to the "prefer" flag, a "not
unless you have to" flag. The GPS does get selected among the various
clock sources but it's the worst of the bunch with respect to jitter and
offset. Those two wander all over while the rest of the Internet servers
and the PPS are stable. It is almost never rejected as an outlier or
false ticker even if it's way out of line with the other sources.
Which GPS receiver are you using? I have an old Motorola that has been
ticking away flawlessly for the last six or seven years.
I found that getting time over the internet was not very satisfactory.
From local midnight until about 7:00 AM it was pretty good but once
people woke up and started using the internet, NTP wasn't working very well.
I'd offer to serve time but my contract with Comcast forbids operating a
server of any kind!
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