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/freebsd/crypto/openssl/doc/man7/
H A DEVP_RAND-JITTER.pod5 EVP_RAND-JITTER - The randomness seed source EVP_RAND implementation
13 "jitter" fluctuations.
15 It is available when OpenSSL is compiled with B<enable-jitter>
21 "JITTER" is the name for this implementation; it can be used with the
44 EVP_RAND *rand = EVP_RAND_fetch(NULL, "JITTER", NULL);
47 The B<enable-jitter> option was added in OpenSSL 3.4.
49 By specifying the B<enable-fips-jitter> configuration option, the FIPS
50 provider will use an internal jitter source for its entropy. Enabling
67 rand = EVP_RAND_fetch(NULL, "JITTER", NULL);
H A DOSSL_PROVIDER-base.pod66 =item JITTER, see L<EVP_RAND-JITTER(7)>
70 In addition to this provider, the "SEED-SRC" and "JITTER" algorithms
/freebsd/secure/lib/libcrypto/man/man7/
H A DEVP_RAND-JITTER.757 .IX Title "EVP_RAND-JITTER 7ossl"
58 .TH EVP_RAND-JITTER 7ossl 2025-09-30 3.5.4 OpenSSL
64 EVP_RAND\-JITTER \- The randomness seed source EVP_RAND implementation
73 It is available when OpenSSL is compiled with \fBenable-jitter\fR
97 \& EVP_RAND *rand = EVP_RAND_fetch(NULL, "JITTER", NULL);
101 The \fBenable-jitter\fR option was added in OpenSSL 3.4.
103 By specifying the \fBenable-fips-jitter\fR configuration option, the FIPS
104 provider will use an internal jitter source for its entropy. Enabling
121 \& rand = EVP_RAND_fetch(NULL, "JITTER", NULL);
H A DOSSL_PROVIDER-base.7112 .IP "JITTER, see \fBEVP_RAND\-JITTER\fR\|(7)" 4
113 .IX Item "JITTER, see EVP_RAND-JITTER"
116 In addition to this provider, the "SEED-SRC" and "JITTER" algorithms
/freebsd/contrib/ntp/html/
H A Dcluster.html17 …he <em>i</em>th candidate on the list, a statistic called the <em>select jitter</em> relative to t…
21 …jitter &phi;<sub>S</sub>(<em>i</em>) computed as the root mean square (RMS) of the <em>d<sub>i</s…
22 …nation condition is met. Note that the select jitter must be recomputed at each round, but the pee…
27 …jitter and &phi;<sub><em>min</em></sub> be the minimum peer jitter over all candidates on the list…
H A Dntpdsim_new.html27 …e offset, frequency offset, propagation delay, processing delay, network jitter and oscillator wan…
36 …ifies the frequency offset, propagation delay, processing delay, network jitter and oscillator wan…
47 …eq_offset</tt> = &lt;number&gt; | <tt>wander</tt> = &lt;number&gt; | <tt>jitter</tt> = &lt;number&…
71 jitter = 0.001;
78 jitter = 0.001;
90 jitter = 0.001;
97 jitter = 0.05;
H A Dstats.html31 … differencess in a sliding window of several samples. This is called <em>jitter</em> symbolized by…
44 …ion continue to grow at the same rate, 15 &mu;s/s. Finally, the <em>peer jitter</em> &phi; is dete…
50 …eer from two statistics, <em>peer jitter</em> and <em>root distance.</em> Peer jitter is determine…
61 …ight factor by the combine algorithm when computing the system clock offset and system jitter.</li>
65 …jitter</em> are weighted averages computed by the clock combine algorithm. System offset is best …
H A Dclockopt.html57 <dd>If the source has a jitter that cannot be sensibly estimated, because
58 it is not statistic jitter, the source will be detected as falseticker
60 certain GPS receivers. Enforcing a minimal jitter value avoids a too
62 higher jitter.
64 clock dispersion, not the clock jitter, despite being called jitter. To
66 "jitter".
70 clocks with reliable jitter that do not intersect otherwise.
H A Dntpdsim.html31 …jitter and oscillator wander. For this purpose the daemon can be driven by pseudorandom jitter and…
36 <p>which starts the simulator with a time offset 100 ms, network jitter 1 ms, frequency offset 400 …
50 <dd>Specify network jitter parameter (0) s.</dd>
H A Dprefer.html35 …jitter. Absent other considerations discussed later, the <em>combined offset</em> is used to disci…
38 …5 ms. However, changes between servers can result in unnecessary system jitter. The object of the…
54 offset and jitter to produce the final values. However, if a prefer
56 …the offset and jitter of the prefer peer are used exclusively as the final values. In the common c…
75 …r is among the survivors, it becomes the system peer and its offset and jitter are inherited by t…
76 …a prefer peer, the PPS driver becomes the system peer and its offset and jitter are inherited by t…
/freebsd/lib/libsys/
H A Dntp_adjtime.296 long jitter; /* pps jitter (us) (ro) */
99 long jitcnt; /* jitter limit exceeded (ro) */
172 PPS signal jitter exceeded (read-only).
199 .It Fa jitter
200 PPS jitter measured by the time median filter in microseconds
209 Number of seconds that have been discarded because the jitter measured
219 or where the calibration interval jitter exceeded two ticks (PPS,
/freebsd/usr.sbin/cron/cron/
H A Dcron.830 .Op Fl j Ar jitter
107 .It Fl j Ar jitter
108 Enable time jitter.
112 .Ar jitter .
116 .Ar jitter
118 Default is 0, which effectively disables time jitter.
124 Enable time jitter for superuser jobs.
/freebsd/contrib/ntp/libntp/lib/isc/
H A Drandom.c101 isc_random_jitter(isc_uint32_t max, isc_uint32_t jitter) { in isc_random_jitter() argument
104 REQUIRE(jitter < max || (jitter == 0 && max == 0)); in isc_random_jitter()
106 if (jitter == 0) in isc_random_jitter()
110 return (max - rnd % jitter); in isc_random_jitter()
/freebsd/contrib/ntp/util/
H A DREADME14 The jitter.c program can be used to determine the timing jitter due to
16 dominant contribution to the jitter budget is the period of the hardware
19 the jitter is dominated only by the operating system.
/freebsd/usr.sbin/virtual_oss/virtual_bt_speaker/
H A Dbt_speaker.c375 uint8_t jitter[jitter_limit * 4] __aligned(4); in process_connection() local
379 for (x = 0; x != sizeof(jitter); x++) in process_connection()
380 jitter[x] = ptr[x % 2]; in process_connection()
382 write(c->oss_fd, jitter, sizeof(jitter)); in process_connection()
388 uint8_t jitter[jitter_limit * 8] __aligned(4); in process_connection() local
392 for (x = 0; x != sizeof(jitter); x++) in process_connection()
393 jitter[x] = ptr[x % 4]; in process_connection()
395 write(c->oss_fd, jitter, sizeof(jitter)); in process_connection()
/freebsd/contrib/ntp/ntpq/
H A Dntpq.1ntpqmdoc311 .Dl [tally]remote refid assid st t when pool reach delay offset jitter
371 frequency tolerance, pps frequency, pps stability, pps jitter,
372 calibration interval, calibration cycles, jitter exceeded,
500 .Dl [tally]remote refid st t when pool reach delay offset jitter
553 .It Cm jitter
632 reference id, reference time, system jitter, clock jitter,
728 combined system jitter
732 clock jitter
740 The jitter an
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H A Dntpq.mdoc.in311 .Dl [tally]remote refid assid st t when pool reach delay offset jitter
371 frequency tolerance, pps frequency, pps stability, pps jitter,
372 calibration interval, calibration cycles, jitter exceeded,
500 .Dl [tally]remote refid st t when pool reach delay offset jitter
553 .It Cm jitter
632 reference id, reference time, system jitter, clock jitter,
728 combined system jitter
732 clock jitter
740 The jitter an
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H A Dntpq-opts.def431 .Dl [tally]remote refid assid st t when pool reach delay offset jitter
491 frequency tolerance, pps frequency, pps stability, pps jitter,
492 calibration interval, calibration cycles, jitter exceeded,
620 .Dl [tally]remote refid st t when pool reach delay offset jitter
673 .It Cm jitter
752 reference id, reference time, system jitter, clock jitter,
850 combined system jitter
854 clock jitter
862 The jitter and wander statistics are exponentially-weighted RMS averages.
863 The system jitter is defined in the NTPv4 specification;
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H A Dntpq.man.in404 .Dl [tally]remote refid assid st t when pool reach delay offset jitter
497 frequency tolerance, pps frequency, pps stability, pps jitter,
498 calibration interval, calibration cycles, jitter exceeded,
690 .Dl [tally]remote refid st t when pool reach delay offset jitter
777 .NOP \f\*[B-Font]jitter\f[]
882 reference id, reference time, system jitter, clock jitter,
1048 combined system jitter
1058 clock jitter
1075 The jitter an
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H A Dntpq.1ntpqman404 .Dl [tally]remote refid assid st t when pool reach delay offset jitter
497 frequency tolerance, pps frequency, pps stability, pps jitter,
498 calibration interval, calibration cycles, jitter exceeded,
690 .Dl [tally]remote refid st t when pool reach delay offset jitter
777 .NOP \f\*[B-Font]jitter\f[]
882 reference id, reference time, system jitter, clock jitter,
1048 combined system jitter
1058 clock jitter
1075 The jitter an
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H A Dntpq.texi369 @code{[tally]remote refid st t when pool reach delay offset jitter}
420 @item @code{jitter}
422 jitter
567 combined system jitter
579 clock jitter
595 The jitter and wander statistics are exponentially-weighted RMS averages.
596 The system jitter is defined in the NTPv4 specification;
597 the clock jitter statistic is computed by the clock discipline module.
739 @item @code{jitter}
741 filter jitter
/freebsd/sys/sys/
H A Dtimex.h88 #define STA_PPSJITTER 0x0200 /* PPS signal jitter exceeded (ro) */
124 * Note: The offset, precision and jitter members are in microseconds if
145 long jitter; /* PPS jitter (ns/us) (ro) */ member
148 long jitcnt; /* jitter limit exceeded (ro) */
/freebsd/sys/net/
H A Dbpf_jitter.h44 * Prototype of a filtering function created by the jitter.
52 /* Structure describing a native filtering program created by the jitter. */
60 * BPF jitter, builds a machine function from a BPF program.
/freebsd/contrib/ntp/kernel/sys/
H A Dtimex.h151 * MAXTIME is the maximum jitter tolerance of the PPS signal if the
160 #define MAXTIME (200L << PPS_AVG) /* max PPS error (jitter) (200 us) */
224 #define STA_PPSJITTER 0x0200 /* PPS signal jitter exceeded (ro) */
276 long jitter; /* pps jitter (us) (ro) */ member
279 long jitcnt; /* jitter limit exceeded (ro) */
/freebsd/contrib/ntp/ntpd/
H A Dntp_refclock.c575 * calculates the mean offset and RMS jitter. A time adjustment
620 * Determine the offset and jitter. in refclock_sample()
623 pp->jitter = 0; in refclock_sample()
626 pp->jitter += SQUARE(off[k] - off[k - 1]); in refclock_sample()
629 m -= (m > 1); /* only (m-1) terms attribute to jitter! */ in refclock_sample()
630 pp->jitter = max(SQRT(pp->jitter / m), LOGTOD(sys_precision)); in refclock_sample()
633 * If the source has a jitter that cannot be estimated, because in refclock_sample()
634 * it is not statistic jitter, the source will be detected as in refclock_sample()
635 * falseticker sooner or later. Enforcing a minimal jitter valu in refclock_sample()
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