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/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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/linux/kernel/time/
H A Dntp.c197 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()
884 static inline long pps_phase_filter_get(long *jitter) in pps_phase_filter_get() argument
886 *jitter = pps_tf[0] - pps_tf[1]; in pps_phase_filter_get()
887 if (*jitter < 0) in pps_phase_filter_get()
888 *jitter = -*jitter; in pps_phase_filter_get()
998 long jitter; in hardpps_update_phase() local
1002 correction = pps_phase_filter_get(&jitter); in hardpps_update_phase()
1008 if (jitter > (pps_jitter << PPS_POPCORN)) { in hardpps_update_phase()
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H A Dtime.c307 txc->jitter = tx32.jitter; in get_old_timex32()
336 tx32.jitter = txc->jitter; in put_old_timex32()
/linux/tools/testing/selftests/rcutorture/bin/
H A Djitterstart.sh21 echo jitterstart.sh: Missing count of jitter.sh scripts to start.
36 jitter.sh $jitter_i "${jittering_dir}/jittering" "$@" &
H A Dkvm.sh57 jitter="-1"
187 --jitter)
188 …checkarg --jitter "(# threads [ sleep [ spin ] ])" $# "$2" '^-\{,1\}[0-9]\+\( \+[0-9]\+\)\{,2\} *$…
189 jitter="$2"
259 jitter=0
472 split(jitter, ja);
590 -v jitter="$jitter" \
/linux/include/uapi/linux/
H A Dtimex.h81 __kernel_long_t jitter; /* pps jitter (us) (ro) */ member
120 long long jitter; /* pps jitter (us) (ro) */ member
H A Dpkt_sched.h509 __u32 jitter; /* random jitter in latency (us) */ member
/linux/net/sched/
H A Dsch_netem.c87 s64 jitter; member
477 if (q->latency || q->jitter || q->rate) in netem_enqueue()
553 delay = tabledist(q->latency, q->jitter, in netem_enqueue()
1018 q->jitter = PSCHED_TICKS2NS(qopt->jitter); in netem_change()
1051 q->jitter = nla_get_s64(tb[TCA_NETEM_JITTER64]); in netem_change()
1060 q->jitter = min_t(s64, abs(q->jitter), INT_MAX); in netem_change()
1169 qopt.jitter = min_t(psched_time_t, PSCHED_NS2TICKS(q->jitter), in netem_dump()
1181 if (nla_put(skb, TCA_NETEM_JITTER64, sizeof(q->jitter), &q->jitter)) in netem_dump()
/linux/Documentation/timers/
H A Dno_hz.rst8 efficiency and reducing OS jitter. Reducing OS jitter is important for
202 So you enable all the OS-jitter features described in this document,
204 your workload isn't affected that much by OS jitter, or is it because
206 by providing a simple OS-jitter test suite, which is available on branch
213 whether or not you have succeeded in removing OS jitter from your system.
214 If this trace shows that you have removed OS jitter as much as is
216 sensitive to OS jitter.
219 We do not currently have a good way to remove OS jitter from single-CPU
286 of OS jitter, including interrupts and system-utility tasks
290 * Some sources of OS jitter can currently be eliminated only by
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/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
/linux/include/linux/
H A Dtime32.h40 s32 jitter; member
/linux/drivers/hte/
H A DKconfig10 less jitter. This framework provides a generic interface to such HTE
/linux/arch/mips/include/asm/octeon/
H A Dcvmx-spxx-defs.h427 uint64_t jitter:3; member
439 uint64_t jitter:3;
/linux/kernel/rcu/
H A DKconfig244 Use this option to reduce OS jitter for aggressive HPC or
247 asymmetric multiprocessors. The price of this reduced jitter
263 Say Y here if you need reduced OS jitter, despite added overhead.
/linux/Documentation/driver-api/
H A Dpps.rst75 you should take into account the latencies and jitter introduced by
77 synchronized with PPS through USB. With USB 2.0, jitter may decrease
/linux/tools/perf/Documentation/
H A Dperf-arm-spe.txt146 jitter=1 - use jitter to avoid resonance when sampling (PMSIRR.RND)
/linux/Documentation/scsi/
H A Dlpfc.rst33 jitter, or a device temporarily loses connectivity (due to its cable
/linux/drivers/perf/
H A Darm_spe_pmu.c212 GEN_PMU_FORMAT_ATTR(jitter);
323 reg |= FIELD_PREP(PMSIRR_EL1_RND, ATTR_CFG_GET_FLD(attr, jitter)); in arm_spe_event_to_pmsirr()
/linux/drivers/net/dsa/sja1105/
H A Dsja1105_static_config.h412 u64 jitter; member
/linux/arch/mips/cavium-octeon/executive/
H A Dcvmx-spi.c279 spxx_trn4_ctl.s.jitter = 1; in cvmx_spi_reset_cb()
/linux/tools/include/uapi/linux/
H A Dpkt_sched.h488 __u32 jitter; /* random jitter in latency (us) */ member
/linux/drivers/isdn/hardware/mISDN/
H A Dhfc_multi.h47 int jitter; member
/linux/Documentation/devicetree/bindings/net/
H A Dmicrel-ksz90x1.txt156 clock because the clock jitter in slave mode is to high (errata#2).
/linux/arch/arm64/
H A DKconfig.platforms262 cores for a minimal latency/jitter datapath, and network
/linux/drivers/iio/imu/inv_icm42600/
H A Dinv_icm42600_accel.c875 ts_chip.jitter = 20; in inv_icm42600_accel_init()

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