On 2/25/2012 21:55, Ron Frazier (NTP) wrote:
On 2/25/2012 5:05 PM, A C wrote:
On 2/25/2012 13:09, Richard B. Gilbert wrote:
On 2/25/2012 1:20 AM, A C wrote:
On 2/24/2012 21:26, A C wrote:
Is it possible to change the polling interval of one or more
associated
servers at runtime? It seems like I should be able to run:
ntpq -c "writevar &associd hpoll=N" or is it ppoll?
Actually, I should have been more specific and say change the minimum
polling interval. In other words, be able to adjust the conf file's
minpoll flag at runtime instead of restarting.
What problem are you trying to solve?
NTPD does a pretty good job of adjusting itself most of the time.
Short poll intervals are useful when correcting large errors.
Long poll intervals allow NTPD to make small corrections very
accurately.
The idea was to bump up the minimum poll interval after ntpd has been
running for a day or so to something more kind to the remote servers
because the refclock is holding the remote servers clamped to 64
seconds. If I set minpoll in the config file, then ntpd's start up
takes a long time because of a long poll interval. If I don't set the
minpoll, then ntpd doesn't do "a pretty good job" because it clamps
the polling interval.
I've noticed the same thing. You could try what I'm doing, although I'm
still testing for the best configuration.
# GPS Lines
server 127.127.20.5 prefer minpoll 3 maxpoll 6 mode 72
fudge 127.127.20.5 time2 0.3100 refid GPS1
# Internet server lines
# NIST New York
server nist1-ny.ustiming.org minpoll 8 maxpoll 13
# other internet server lines similar
Sincerely,
I know I can do that to the config file but then it takes forever to
synchronize. As I said, the idea was to not give a min/maxpoll so that
ntpd would converge on a clock adjustment quickly (polling once ever 64
seconds) and then, after a couple days, I could throttle back the
polling interval without restarting the server and changing the
configuration file.
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