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2026-09-21 - 17:52
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Data to construct the above plot have been generated using the RT test utility cyclictest.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rackbslot7.osadl.org (updated Mon Sep 21, 2026 12:44:28)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
29173991243,66cyclictest32258-21timerwakeupswit12:34:240
29173991243,66cyclictest32258-21timerwakeupswit12:34:240
2891521227,17sleep00-21swapper/007:07:140
2817321219,86sleep20-21swapper/207:04:232
29029210511,61sleep129061-21munin-run07:08:461
291819910175,17cyclictest6969-21apt-key09:13:491
2022521000,8sleep30-21swapper/310:29:003
29181999869,19cyclictest3682-21diskmemload09:14:381
29181999869,19cyclictest3682-21diskmemload09:14:381
2918199983,78cyclictest12938-21apt-get09:24:001
2918199983,78cyclictest12938-21apt-get09:24:001
29181999530,35cyclictest31-21ksoftirqd/108:22:351
29181999371,16cyclictest662-21cron07:58:451
29173999314,63cyclictest9260-21diskmemload11:04:220
29173999138,17cyclictest181rcu_preempt09:35:260
2917399913,77cyclictest7237-21apt-get09:14:000
2917399913,77cyclictest7237-21apt-get09:14:000
2918199892,76cyclictest4051-21kworker/u18:2+flush-179:011:44:081
29189998759,20cyclictest12801-21switchtime07:54:212
29189998719,26cyclictest1-21systemd09:43:462
29181998767,15cyclictest25784-21fschecks_count09:44:081
2917399873,45cyclictest20069-21entropy12:15:470
2917399873,45cyclictest20069-21entropy12:15:470
29189998663,16cyclictest3038-21timerandwakeup09:59:212
2806928611,56sleep30-21swapper/307:04:193
2918999859,65cyclictest409-21apt-get11:44:002
2918999852,72cyclictest9106-21apt-get11:04:022
29189998515,32cyclictest18463-21taskset09:31:492
2918199853,66cyclictest9234-21ssh11:04:171
29173998546,31cyclictest0-21swapper/009:44:210
29181998413,47cyclictest31-21ksoftirqd/109:00:581
29173998464,15cyclictest29167-21cyclictest10:54:570
29173998464,15cyclictest29167-21cyclictest10:54:570
29173998448,24cyclictest12364-21grep07:54:090
2918199832,38cyclictest31-21ksoftirqd/110:43:091
29173998355,9cyclictest181rcu_preempt07:40:440
29173998351,10cyclictest181rcu_preempt10:49:010
2918999825,55cyclictest19252-21apt-get12:14:032
2918999825,55cyclictest19252-21apt-get12:14:032
29181998259,15cyclictest200-21systemd-journal11:40:131
29181998244,7cyclictest181rcu_preempt11:19:201
29173998260,14cyclictest31768-21ssh09:54:080
29173998217,13cyclictest181rcu_preempt11:44:330
29189998120,24cyclictest22100-21kworker/u19:2+flush-179:007:39:002
2917399815,30cyclictest25012-21awk11:29:210
29173998143,15cyclictest181rcu_preempt12:08:590
29189998060,14cyclictest29167-21cyclictest10:05:132
29189998015,30cyclictest17014-21taskset11:16:362
29181998063,11cyclictest22995-21processes12:19:171
29181998053,10cyclictest181rcu_preempt08:24:191
2917399807,48cyclictest13486-21apt-get09:24:040
2917399807,48cyclictest13486-21apt-get09:24:040
29189997959,14cyclictest4838-21ssh11:49:222
29189997958,16cyclictest24059-21sshd12:21:132
29181997942,10cyclictest170-21jbd2/mmcblk2p2-809:59:241
2918199792,49cyclictest31-21ksoftirqd/107:37:231
29173997939,12cyclictest181rcu_preempt12:00:430
2917399793,38cyclictest20819-21latency_hist11:23:480
2917399793,35cyclictest3827-21latency_hist09:08:490
29173997932,12cyclictest181rcu_preempt10:30:160
29173997925,12cyclictest181rcu_preempt12:04:100
29189997832,35cyclictest728-21sort08:59:002
29189997820,25cyclictest28376-21sh10:42:152
2918199788,37cyclictest31-21ksoftirqd/110:27:251
29181997859,13cyclictest17098-21unixbench_singl12:09:241
29181997856,16cyclictest1-21systemd10:19:451
29181997856,16cyclictest1-21systemd10:19:451
29173997859,12cyclictest13475-21kworker/u17:2+rpciod11:49:120
29173997855,10cyclictest58-21kcompactd010:28:310
29173997850,20cyclictest26679-21kernelversion10:39:110
29189997713,25cyclictest16251-21taskset10:22:022
29189997713,25cyclictest16251-21taskset10:22:022
29189997712,23cyclictest16523-21seq08:06:472
29181997755,16cyclictest13179-21sh11:09:261
29181997755,16cyclictest13179-21sh11:09:261
29181997738,11cyclictest25225-21ssh10:36:551
29181997723,29cyclictest31-21ksoftirqd/109:06:081
29181997721,29cyclictest31-21ksoftirqd/111:02:561
29181997720,17cyclictest0-21swapper/109:40:211
29173997755,15cyclictest29167-21cyclictest08:14:080
29173997750,19cyclictest28042-21timerandwakeup11:34:240
29173997748,18cyclictest12025-21threads10:14:220
29173997731,9cyclictest181rcu_preempt08:34:080
29189997651,17cyclictest1877-21latency_hist09:58:472
2918999763,52cyclictest3369-21kworker/u17:2+ext4-rsv-conversion09:14:112
2918999763,52cyclictest3369-21kworker/u17:2+ext4-rsv-conversion09:14:112
29181997654,16cyclictest0-21swapper/107:48:491
29181997642,12cyclictest181rcu_preempt10:14:041
29181997614,30cyclictest31-21ksoftirqd/107:33:341
29181997613,25cyclictest31-21ksoftirqd/107:20:461
29173997656,12cyclictest15-21ksoftirqd/010:09:030
29173997656,12cyclictest15-21ksoftirqd/010:09:030
29173997645,13cyclictest181rcu_preempt08:38:590
2917399764,30cyclictest343-21runrttasks08:30:070
29173997635,12cyclictest181rcu_preempt09:40:170
29189997554,11cyclictest0-21swapper/209:13:482
29189997550,16cyclictest0-21swapper/210:29:212
29189997534,13cyclictest181rcu_preempt10:49:212
29189997512,26cyclictest31774-21ssh10:48:192
29189997512,26cyclictest31774-21ssh10:48:192
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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