Lines Matching +full:startup +full:- +full:delay +full:- +full:ms
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
46 configuration file at startup time in order to determine the
92 doc-section = {
93 ds-type = 'USAGE';
94 ds-format = 'mdoc';
95 ds-text = <<- _END_MDOC_USAGE
112 This initial delay to set the clock
122 time-of-year (TOY) chip to maintain the time during periods when
161 congestion, the roundtrip delay jitter can exceed three seconds and
162 the synchronization distance, which is equal to one-half the
163 roundtrip delay plus error budget terms, can become very large.
166 algorithms discard sample offsets exceeding 128 ms,
168 ms exceeds 900s.
176 very rarely strays more than 128 ms even under extreme cases of
182 the error might grow to exceed 128 ms,
198 to 500 parts-per-million (PPM) as a consequence of the correctness
211 outside the 128-ms range and an eventual step or slew time
237 in the past many startup scripts would run
268 will effectively "warm-start" and your system's clock will
271 As soon as possible in the startup sequence, start
289 monotonically-increasing time,
291 .Xr ntp-wait 1ntp-waitmdoc
297 .Xr ntp-wait 1ntp-waitmdoc
304 behavior at startup depends on whether the
346 However, it can operate in a one-time
351 compute server-client propagation delay correction factors and
363 incidental roundtrip delay jitter and oscillator frequency wander
428 stopped and run in one-time mode as required.
429 At each startup, the
479 .Ss "The huff-n'-puff Filter"
490 The huff-n'-puff filter is designed to correct the apparent time
493 delay when no other traffic is present.
497 register that remembers the minimum delay over the most recent
500 delay, the filter corrects the apparent offset using the sign of
501 the offset and the difference between the apparent delay and
502 minimum delay.
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