ntpd flipping between PLL and FLL mode

Jeremy Chadwick koitsu at FreeBSD.org
Tue Dec 19 08:57:49 PST 2006

On Tue, Dec 19, 2006 at 10:56:22AM -0500, Michael Proto wrote:
> An alternate workaround I've discovered is to use a maxpoll of 9 in
> /etc/ntp.conf:
> server rolex.peachnet.edu maxpoll 9
> Since implementing this I haven't seen any of the FLL/PLL flips in my logs.

How would decreasing the polling time fix this?  I do not understand
the semantics/behaviour of NTP very well.

Taken from the manpage:

  maxpoll maxpoll
          These options specify the minimum and maximum poll intervals for
          NTP messages, in seconds to the power of two.  The maximum poll
          interval defaults to 10 (1,024 s), but can be increased by the
          maxpoll option to an upper limit of 17 (36.4 h).  The minimum
          poll interval defaults to 6 (64 s), but can be decreased by the
          minpoll option to a lower limit of 4 (16 s).

| Jeremy Chadwick                                 jdc at parodius.com |
| Parodius Networking                        http://www.parodius.com/ |
| UNIX Systems Administrator                   Mountain View, CA, USA |
| Making life hard for others since 1977.               PGP: 4BD6C0CB |

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