On 02/11/2012 06:11 PM, Richard B. Gilbert wrote:
On 2/11/2012 4:14 PM, Ron Frazier (NTP) wrote:
Hi all,
I now have my USB GPS working at an acceptable level on both Windows and
Linux using only NTPD. I have the GPS server line set as prefer, but
there are other server lines which poll the internet. Sometimes, the
system selects an internet clock rather than my GPS. How do I force NTP
to use my GPS if it's available, no matter what (within reason). The
only time I ever want it to select an internet server is if the GPS
fails or is not plugged in.
Sincerely,
Ron
ISTR a "prefer" keyword used to instruct NTPD to use a designated
time source if that source is available. Other sources configured will
be used only if the "preferred" source is not available or obviously
insane. Or something like that! It goes in NTPD.CONF IIRC.
Hi Richard (and others),
Thanks for the note. I have prefer on my gps line in ntp.conf. I have to
do more testing. I thought I saw it select another clock anyway some
time during the day. I know the GPS was available at the time and it
wasn't insane.
Also, something else strange just happened. I shut down NTPD for
literally about only a minute to tweak the fudge factor in ntp.conf by
about 5 ms. When I restarted it, the offset between the computer's clock
and ALL my time sources including the GPS was about 160 ms. Before the
shutdown, it was only about 2 ms. I don't think it should drift out 1/6
sec in one minute. I've restarted NTPD and I'll see what happens.
Sincerely,
Ron
--
(PS - If you email me and don't get a quick response, don't be concerned.
I get about 300 emails per day from alternate energy mailing lists and
such. I don't always see new messages very quickly. If you need a
reply and have not heard from me in 1 - 2 weeks, send your message again.)
Ron Frazier
timekeepingdude AT c3energy.com
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