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2026-05-27 - 15:09
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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 Wed May 27, 2026 12:44:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
23941212513,82sleep223953-21modprobe07:00:192
240859910253,13cyclictest181rcu_preempt08:25:560
240909910070,9cyclictest181rcu_preempt07:35:552
240909910070,9cyclictest181rcu_preempt07:35:552
24085999752,17cyclictest181rcu_preempt11:12:540
24085999752,17cyclictest181rcu_preempt11:12:540
24089999552,33cyclictest24077-21cyclictest09:35:381
24085999534,17cyclictest181rcu_preempt07:30:520
24089999471,16cyclictest29269-21latency_hist10:45:201
24090999253,18cyclictest181rcu_preempt10:21:052
24090999253,18cyclictest181rcu_preempt10:21:052
24090999120,33cyclictest0-21swapper/209:53:392
24089999114,39cyclictest17653-21ls10:25:351
24085999153,8cyclictest181rcu_preempt07:00:520
24085999152,21cyclictest181rcu_preempt10:02:490
24089999073,11cyclictest26754-21gpgv11:35:211
24090998966,15cyclictest32716-21mailstats09:55:512
24090998964,19cyclictest8330-21sh09:15:462
2408599899,62cyclictest27762-21diskstats11:36:270
2408599899,62cyclictest27762-21diskstats11:36:270
24090998858,9cyclictest181rcu_preempt12:15:212
24085998870,13cyclictest11085-21ntpd10:20:530
24085998870,13cyclictest11085-21ntpd10:20:530
24085998745,8cyclictest181rcu_preempt11:59:520
24085998745,8cyclictest181rcu_preempt11:59:520
24089998669,11cyclictest7635-21ssh11:55:531
24089998669,11cyclictest7635-21ssh11:55:531
24089998634,40cyclictest16469-21apt-get08:15:311
24085998612,51cyclictest15-21ksoftirqd/010:30:180
24090998548,13cyclictest181rcu_preempt11:55:482
24090998548,13cyclictest181rcu_preempt11:55:482
24090998543,12cyclictest181rcu_preempt10:31:382
24090998540,8cyclictest181rcu_preempt09:33:512
24090998540,8cyclictest181rcu_preempt09:33:512
24089998567,11cyclictest22685-21systemd-run08:35:201
24089998548,28cyclictest10973-21grep07:55:551
24085998565,12cyclictest31226-21cpuspeed07:20:350
24085998558,18cyclictest8329-21latency_hist07:50:220
24085998515,42cyclictest15-21ksoftirqd/009:55:510
24090998456,8cyclictest181rcu_preempt08:45:222
24089998427,27cyclictest0-21swapper/109:50:441
24085998452,8cyclictest181rcu_preempt09:17:570
24090998351,11cyclictest181rcu_preempt12:27:532
24090998351,11cyclictest181rcu_preempt12:27:532
24089998363,14cyclictest30985-21diskmemload10:15:551
24085998353,8cyclictest181rcu_preempt11:30:090
2409099828,32cyclictest27325-21ssh11:35:372
2409099828,32cyclictest27325-21ssh11:35:372
24090998262,11cyclictest0-21swapper/210:40:512
24090998258,15cyclictest24427-21timerandwakeup10:35:532
24085998262,12cyclictest28009-21apt-get08:51:000
24085998252,8cyclictest181rcu_preempt10:45:350
24085998244,24cyclictest181rcu_preempt09:49:080
24085998236,14cyclictest181rcu_preempt07:05:430
24085998228,20cyclictest0-21swapper/012:25:360
24085998228,20cyclictest0-21swapper/012:25:360
2408599822,50cyclictest15-21ksoftirqd/011:05:210
2408599822,50cyclictest15-21ksoftirqd/011:05:210
24090998156,13cyclictest0-21swapper/209:10:222
24090998143,8cyclictest181rcu_preempt07:15:422
24090998141,13cyclictest181rcu_preempt10:08:212
24090998141,13cyclictest181rcu_preempt10:08:212
24090998136,8cyclictest181rcu_preempt07:50:562
24085998161,10cyclictest0-21swapper/011:10:180
24085998156,8cyclictest181rcu_preempt10:55:390
24085998156,10cyclictest181rcu_preempt08:20:500
24085998141,14cyclictest181rcu_preempt08:03:150
24085998140,8cyclictest181rcu_preempt11:33:470
24085998138,32cyclictest15733-21kworker/u17:0+nfsiod10:05:580
24085998138,32cyclictest15733-21kworker/u17:0+nfsiod10:05:580
24085998138,14cyclictest181rcu_preempt10:17:110
24085998136,14cyclictest0-21swapper/011:21:270
24090998055,18cyclictest1563-21latency_hist09:05:212
24090998045,14cyclictest4148-21ssh10:02:232
24085998034,14cyclictest181rcu_preempt10:31:470
24090997967,9cyclictest24077-21cyclictest11:10:142
24090997958,10cyclictest0-21swapper/208:15:452
24090997956,15cyclictest30985-21diskmemload12:20:532
24090997944,13cyclictest181rcu_preempt12:15:472
24090997944,13cyclictest181rcu_preempt12:15:472
24085997956,17cyclictest30985-21diskmemload09:14:350
24085997949,12cyclictest181rcu_preempt12:03:580
24090997859,12cyclictest24077-21cyclictest08:05:222
24090997856,7cyclictest181rcu_preempt10:55:382
24089997857,15cyclictest7352-21processes07:45:531
24085997842,8cyclictest181rcu_preempt09:00:480
24090997760,9cyclictest0-21swapper/211:10:352
24090997760,9cyclictest0-21swapper/211:10:352
24090997755,8cyclictest181rcu_preempt08:30:402
24090997755,14cyclictest27165-21sh11:35:222
24090997751,8cyclictest181rcu_preempt09:25:462
2409099773,28cyclictest8123-21modprobe07:50:182
24090997731,12cyclictest181rcu_preempt10:15:542
2408999779,32cyclictest0-21swapper/110:55:371
24089997757,14cyclictest25550-21switchtime12:25:521
24089997757,14cyclictest25550-21switchtime12:25:521
24089997755,16cyclictest4011-21fschecks_count11:50:381
24085997755,14cyclictest2374-21systemd-journal09:20:500
24085997755,14cyclictest2374-21systemd-journal09:20:500
24090997641,12cyclictest181rcu_preempt10:29:262
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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