Lines Matching +full:cm +full:- +full:poll +full:- +full:interval
1 /* -*- Mode: Text -*- */
7 prog-name = "ntpd";
8 prog-title = "set clock via Network Time Protocol daemon";
11 #include ntpdbase-opts.def
14 explain = <<- _END_EXPLAIN
17 doc-section = {
18 ds-type = 'DESCRIPTION';
19 ds-format = 'mdoc';
20 ds-text = <<- _END_PROG_MDOC_DESCRIP
27 Network Time Protocol (NTP) version 4, as defined by RFC-5905,
29 version 3, as defined by RFC-1305, and versions 1
30 and 2, as defined by RFC-1059 and RFC-1119, respectively.
34 utility does most computations in 64-bit floating point
35 arithmetic and does relatively clumsy 64-bit fixed point operations
92 doc-section = {
93 ds-type = 'USAGE';
94 ds-format = 'mdoc';
95 ds-text = <<- _END_MDOC_USAGE
100 one or more configured servers over a range of designated poll intervals.
107 from bursts, the initial poll interval for each server is delayed
108 an interval randomized over a few seconds.
109 At the default initial poll
110 interval of 64s, several minutes can elapse before the clock is
114 .Cm iburst
122 time-of-year (TOY) chip to maintain the time during periods when
162 the synchronization distance, which is equal to one-half the
167 unless the interval during which no sample offset is less than 128
198 to 500 parts-per-million (PPM) as a consequence of the correctness
204 During this interval the
211 outside the 128-ms range and an eventual step or slew time
225 .Cm time.ien.it
230 .Cm burst
259 .Cm iburst
261 .Cm server
268 will effectively "warm-start" and your system's clock will
286 .Cm dovecot
289 monotonically-increasing time,
291 .Xr ntp-wait 1ntp-waitmdoc
297 .Xr ntp-wait 1ntp-waitmdoc
346 However, it can operate in a one-time
351 compute server-client propagation delay correction factors and
364 and determines the best poll interval using a heuristic algorithm.
371 unreachable for some time, the poll interval is increased in steps
398 .Cm iburst
428 stopped and run in one-time mode as required.
432 .Ss "Poll Interval Control"
437 accuracy by reducing the interval or to reduce network overhead by
440 the consequences of changing the poll adjustment range from the
445 .Cm minpoll
449 .Cm minpoll
452 will not operate properly if the poll interval is less than 64 s
457 useful to increase the minimum interval to a few tens of minutes
458 and maximum interval to a day or so.
461 interval will be increased in steps from the minimum to the
466 range of the loop is 500 PPM at an interval of 64s decreasing by a
467 factor of two for each doubling of interval.
479 .Ss "The huff-n'-puff Filter"
490 The huff-n'-puff filter is designed to correct the apparent time
498 interval measured usually in hours.
510 .Cm huffpuff
516 doc-section = {
517 ds-type = 'FILES';
518 ds-format = 'mdoc';
519 ds-text = <<- _END_MDOC_FILES
520 .Bl -tag -width /etc/ntp.drift -compact
531 doc-section = {
532 ds-type = 'SEE ALSO';
533 ds-format = 'mdoc';
534 ds-text = <<- _END_MDOC_SEE_ALSO
592 doc-section = {
593 ds-type = 'BUGS';
594 ds-format = 'mdoc';
595 ds-text = <<- _END_MDOC_BUGS
600 larger than might be desirable for an elevated-priority
609 doc-section = {
610 ds-type = 'NOTES';
611 ds-format = 'mdoc';
612 ds-text = <<- _END_MDOC_NOTES