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/openbmc/linux/Documentation/admin-guide/
H A Dkernel-per-CPU-kthreads.rst2 Reducing OS jitter due to per-cpu kthreads
6 options to control their OS jitter. Note that non-per-CPU kthreads are
7 not listed here. To reduce OS jitter from non-per-CPU kthreads, bind
26 - In order to locate kernel-generated OS jitter on CPU N:
43 To reduce its OS jitter, do any of the following:
62 To reduce its OS jitter, do the following:
73 To reduce its OS jitter, do one of the following:
87 To reduce its OS jitter, each softirq vector must be handled
202 housekeeping CPUs, which can tolerate OS jitter.
228 To reduce its OS jitter, do any of the following:
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/openbmc/u-boot/cmd/aspeed/
H A Ddptest.h181 printf("3.11 Non ISI Jitter Test -PRBS7\n");\
182 printf("3.12 Total Jitter Test -PRBS7\n")\
195 #define PRINT_ITEM_G printf("3.12 Total Jitter Test with No Cable Model -D10.2\n");\
196 printf("3.12 Total Jitter Test -D10.2\n");\
197 printf("3.12 Deterministic Jitter Test with No Cable Model -D10.2\n");\
198 printf("3.12 Deterministic Jitter Test -D10.2\n");\
199 printf("3.12 Random Jitter Test with No Cable Model -D10.2\n");\
200 printf("3.12 Random Jitter Test -D10.2\n");\
213 printf("3.12 Total Jitter Test with No Cable Model -HBR2CPAT\n");\
214 printf("3.12 Total Jitter Test -HBR2CPAT\n");\
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/openbmc/linux/drivers/iio/common/inv_sensors/
H A Dinv_sensors_timestamp.c13 /* compute jitter, min and max following jitter in per mille */
48 ts->min_period = INV_SENSORS_TIMESTAMP_MIN(chip->clock_period, chip->jitter); in inv_sensors_timestamp_init()
49 ts->max_period = INV_SENSORS_TIMESTAMP_MAX(chip->clock_period, chip->jitter); in inv_sensors_timestamp_init()
115 int64_t delta, jitter; in inv_align_timestamp_it() local
121 /* adjust timestamp while respecting jitter */ in inv_align_timestamp_it()
124 jitter = INV_SENSORS_TIMESTAMP_JITTER((int64_t)ts->period, ts->chip.jitter); in inv_align_timestamp_it()
125 if (delta > jitter) in inv_align_timestamp_it()
127 else if (delta < -jitter) in inv_align_timestamp_it()
/openbmc/linux/tools/testing/selftests/rcutorture/bin/
H A Djitterstart.sh4 # Start up the specified number of jitter.sh scripts in the background.
8 # n: Number of jitter.sh scripts to start up.
21 echo jitterstart.sh: Missing count of jitter.sh scripts to start.
36 jitter.sh $jitter_i "${jittering_dir}/jittering" "$@" &
H A Dkvm.sh56 jitter="-1"
76 echo " --jitter N [ maxsleep (us) [ maxspin (us) ] ]"
176 --jitter)
177 …checkarg --jitter "(# threads [ sleep [ spin ] ])" $# "$2" '^-\{,1\}[0-9]\+\( \+[0-9]\+\)\{,2\} *$…
178 jitter="$2"
245 # If you really want jitter for refscale or
247 # or the refscale. (But why jitter in these cases?)
248 jitter=0
461 split(jitter, ja);
521 print "echo Build-only run, so suppressing jitter | tee -a " rd "log"
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H A Djitter.sh5 # of this script is to inflict random OS jitter on a concurrently running
8 # Usage: jitter.sh me jittering-path duration [ sleepmax [ spinmax ] ]
H A Dkvm-test-1-run-batch.sh48 # Start up jitter, start each scenario, wait, end jitter.
H A Dkvm-transform.sh10 # jitter_dir: Jitter directory for TORTURE_JITTER_START and
42 echo "Need valid jitter directory: '$jitter_dir'"
H A Djitterstop.sh4 # Remove the "jittering" file, signaling the jitter.sh scripts to stop,
/openbmc/linux/crypto/
H A Djitterentropy.c2 * Non-physical true random number generator based on timing jitter --
3 * Jitter RNG standalone code.
54 …#error "The CPU Jitter random number generator must not be compiled with optimizations. See docume…
201 * The Jitter RNG uses an enhanced version of the Repetition Count Test
204 * values during the generation of one Jitter RNG output block.
208 * During the counting operation, the Jitter RNG always calculates the RCT
210 * the Jitter RNG output block will be calculated completely but discarded at
211 * the end. The caller of the Jitter RNG is informed with an error code.
239 * 1st derivative of the jitter measurement (time delta)
240 * 2nd derivative of the jitter measurement (delta of time deltas)
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H A Djitterentropy-kcapi.c2 * Non-physical true random number generator based on timing jitter --
225 * Jitter RNG's unpredictable behavior. If we have a slower hash in jent_kcapi_init()
282 panic("Jitter RNG permanent health test failure\n"); in jent_kcapi_random()
284 pr_err("Jitter RNG permanent health test failure\n"); in jent_kcapi_random()
288 pr_warn_ratelimited("Reset Jitter RNG due to intermittent health test failure\n"); in jent_kcapi_random()
363 MODULE_DESCRIPTION("Non-physical True Random Number Generator based on CPU Jitter");
/openbmc/linux/Documentation/timers/
H A Dno_hz.rst8 efficiency and reducing OS jitter. Reducing OS jitter is important for
205 So you enable all the OS-jitter features described in this document,
207 your workload isn't affected that much by OS jitter, or is it because
209 by providing a simple OS-jitter test suite, which is available on branch
216 whether or not you have succeeded in removing OS jitter from your system.
217 If this trace shows that you have removed OS jitter as much as is
219 sensitive to OS jitter.
222 We do not currently have a good way to remove OS jitter from single-CPU
289 of OS jitter, including interrupts and system-utility tasks
293 * Some sources of OS jitter can currently be eliminated only by
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/openbmc/linux/kernel/time/
H A Dntp.c106 static long pps_jitter; /* current jitter (ns) */
117 static long pps_jitcnt; /* jitter limit exceeded */
182 /* PPS jitter exceeded when in is_error_status()
197 txc->jitter = pps_jitter; in pps_fill_timex()
199 txc->jitter = pps_jitter / NSEC_PER_USEC; in pps_fill_timex()
229 txc->jitter = 0; in pps_fill_timex()
875 /* get current phase correction and jitter */
876 static inline long pps_phase_filter_get(long *jitter) in pps_phase_filter_get() argument
878 *jitter = pps_tf[0] - pps_tf[1]; in pps_phase_filter_get()
879 if (*jitter < 0) in pps_phase_filter_get()
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/openbmc/openbmc/poky/meta/recipes-support/libjitterentropy/
H A Dlibjitterentropy_3.6.1.bb1 SUMMARY = "Hardware RNG based on CPU timing jitter"
2 DESCRIPTION = "The Jitter RNG provides a noise source using the CPU execution timing jitter. \
/openbmc/linux/include/uapi/linux/
H A Dtimex.h81 __kernel_long_t jitter; /* pps jitter (us) (ro) */ member
84 __kernel_long_t jitcnt; /* jitter limit exceeded (ro) */
120 long long jitter; /* pps jitter (us) (ro) */ member
124 long long jitcnt; /* jitter limit exceeded (ro) */
182 #define STA_PPSJITTER 0x0200 /* PPS signal jitter exceeded (ro) */
/openbmc/linux/include/linux/iio/common/
H A Dinv_sensors_timestamp.h12 * @jitter: acceptable jitter in per-mille
17 uint32_t jitter; member
/openbmc/linux/include/linux/usb/
H A Dmidi-v2.h41 #define USB_MS_MIDI_PROTO_1_0_64_JRTS 0x02 /* MIDI 1.0, UMP up to 64bits, Jitter Reduction Timestam…
43 #define USB_MS_MIDI_PROTO_1_0_128_JRTS 0x04 /* MIDI 1.0, UMP up to 128bits, Jitter Reduction Timest…
45 #define USB_MS_MIDI_PROTO_2_0_JRTS 0x12 /* MIDI 2.0, Jitter Reduction Timestamps */
/openbmc/linux/net/sched/
H A Dsch_netem.c43 packets and add random jitter (and correlation). The random
77 /* a linear queue; reduces rbtree rebalancing when jitter is low */
89 s64 jitter; member
481 if (q->latency || q->jitter || q->rate) in netem_enqueue()
557 delay = tabledist(q->latency, q->jitter, in netem_enqueue()
1028 q->jitter = PSCHED_TICKS2NS(qopt->jitter); in netem_change()
1061 q->jitter = nla_get_s64(tb[TCA_NETEM_JITTER64]); in netem_change()
1069 /* capping jitter to the range acceptable by tabledist() */ in netem_change()
1070 q->jitter = min_t(s64, abs(q->jitter), INT_MAX); in netem_change()
1179 qopt.jitter = min_t(psched_time_t, PSCHED_NS2TICKS(q->jitter), in netem_dump()
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/openbmc/linux/Documentation/sound/cards/
H A Dimg-spdif-in.rst43 This control is used to modify the locking/jitter rejection characteristics
44 of the block. Larger values increase the locking range, but reduce jitter
/openbmc/linux/drivers/iio/frequency/
H A DKconfig15 tristate "Analog Devices AD9523 Low Jitter Clock Generator"
18 Say yes here to build support for Analog Devices AD9523 Low Jitter
/openbmc/linux/drivers/media/pci/mantis/
H A Dmantis_pcmcia.c28 * again, definitely it is jitter alone
52 * again, definitely it is jitter alone
/openbmc/linux/kernel/trace/
H A Dtrace_clock.c11 * - medium: scalable global clock with some jitter
54 * jitter between CPUs. So it's a pretty scalable clock, but there
/openbmc/linux/kernel/rcu/
H A DKconfig240 Use this option to reduce OS jitter for aggressive HPC or
243 asymmetric multiprocessors. The price of this reduced jitter
259 Say Y here if you need reduced OS jitter, despite added overhead.
/openbmc/linux/include/linux/
H A Dtrace_clock.h10 * - medium: scalable global clock with some jitter
/openbmc/linux/drivers/input/touchscreen/
H A Dmk712.c21 * 1999-12-19: added anti-jitter code, report pen-up events, fixed mk712_poll
24 * 2000-01-05: checked in new anti-jitter code, changed mouse protocol, fixed

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