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2026-09-07 - 19:26
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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 07, 2026 12:44:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1794021117,18sleep00-21swapper/007:07:400
16941210710,69sleep116947-21/usr/sbin/munin07:05:081
182509910211,36cyclictest0-21swapper/011:04:570
18255999833,31cyclictest23192-21seq10:50:031
18262999453,18cyclictest181rcu_preempt10:07:522
18255999474,13cyclictest16975-21runrttasks10:39:541
18262999356,13cyclictest181rcu_preempt07:14:482
18262999356,13cyclictest181rcu_preempt07:14:482
18250999169,14cyclictest4227-21latency_hist08:04:440
1825099912,78cyclictest7778-21kworker/u19:0+ext4-rsv-conversion12:10:350
18255998927,25cyclictest200-21systemd-journal09:44:581
18255998927,25cyclictest200-21systemd-journal09:44:581
18250998926,54cyclictest1370-21apt-get10:14:570
1826299886,60cyclictest9479-21ssh11:20:102
1825099882,60cyclictest9418-21sh11:20:000
18262998770,8cyclictest0-21swapper/209:45:032
18262998770,8cyclictest0-21swapper/209:45:032
18262998762,17cyclictest326-21systemd-logind10:04:432
1826299873,34cyclictest23730-21latency_hist07:24:442
1826299873,34cyclictest23730-21latency_hist07:24:442
18255998737,34cyclictest5659-21apt-get09:29:531
1826299867,57cyclictest23428-21apt-get12:35:012
18262998644,15cyclictest181rcu_preempt08:20:042
18262998644,15cyclictest181rcu_preempt08:20:042
1826299863,62cyclictest17162-21ssh10:40:212
18262998554,12cyclictest181rcu_preempt10:35:082
18262998549,10cyclictest181rcu_preempt12:07:022
18262998544,13cyclictest32508-21ssh11:05:002
18255998531,24cyclictest11121-21taskset10:30:081
18250998565,15cyclictest12013-21vmstat12:15:210
18250998565,15cyclictest12013-21vmstat12:15:210
18262998429,13cyclictest181rcu_preempt11:00:202
1825599846,68cyclictest23505-21ssh12:35:041
18255998458,19cyclictest3571-21ssh12:02:581
18255998432,39cyclictest0-21swapper/111:39:541
18255998432,39cyclictest0-21swapper/111:39:541
18255998428,25cyclictest32130-21taskset10:11:071
18250998465,13cyclictest29494-21sh11:51:580
18255998327,20cyclictest0-21swapper/109:53:131
18262998252,12cyclictest181rcu_preempt09:10:542
18255998256,19cyclictest19248-21timerandwakeup07:10:191
18255998256,19cyclictest19248-21timerandwakeup07:10:191
18255998222,27cyclictest13012-21ntpq11:25:101
18255998222,27cyclictest13012-21ntpq11:25:101
18250998260,14cyclictest1128-21idleruntime-cro11:59:420
18262998146,13cyclictest181rcu_preempt09:00:382
1826299812,33cyclictest20127-21apt-get12:29:522
18255998129,36cyclictest7002-21vmstat08:10:211
18255998127,22cyclictest0-21swapper/111:38:401
18255998126,22cyclictest3986-21taskset10:19:231
18255998123,23cyclictest0-21swapper/109:55:571
18250998159,17cyclictest20549-21latency10:45:080
18250998159,17cyclictest20549-21latency10:45:080
18262998047,18cyclictest181rcu_preempt11:54:532
18262998037,11cyclictest181rcu_preempt11:53:152
18262998015,38cyclictest2277-21ssh12:00:172
18250998057,16cyclictest20936-21fschecks_count07:15:380
18250998057,16cyclictest20936-21fschecks_count07:15:380
18262997957,13cyclictest21333-21ssh10:45:452
18262997957,13cyclictest21333-21ssh10:45:452
18262997957,12cyclictest25572-21latency_hist09:09:462
18262997957,12cyclictest25572-21latency_hist09:09:462
18262997948,9cyclictest181rcu_preempt08:26:332
18262997948,9cyclictest181rcu_preempt08:26:332
18262997934,13cyclictest181rcu_preempt07:55:152
18262997934,13cyclictest181rcu_preempt07:55:152
18262997927,10cyclictest0-21swapper/208:34:542
18255997957,15cyclictest8979-21systemctl08:19:421
18255997938,32cyclictest0-21swapper/108:19:571
18255997938,32cyclictest0-21swapper/108:19:571
18255997929,18cyclictest27470-21taskset09:12:041
18255997927,25cyclictest343-21runrttasks12:32:161
18255997927,20cyclictest343-21runrttasks11:15:211
18255997927,20cyclictest343-21runrttasks11:15:211
18255997926,26cyclictest14557-21taskset09:44:301
18255997920,27cyclictest0-21swapper/110:46:171
18255997920,27cyclictest0-21swapper/110:46:171
1825099799,60cyclictest16995-21apt-get10:40:190
1825099793,64cyclictest23474-21ssh12:35:000
18262997857,15cyclictest662-21cron08:59:422
18262997857,15cyclictest524-21in:imuxsock11:49:422
18262997854,15cyclictest6927-21timerandwakeup11:15:182
18262997854,15cyclictest6927-21timerandwakeup11:15:182
18262997848,20cyclictest32209-21fschecks_count07:50:052
18262997847,8cyclictest181rcu_preempt09:15:342
18262997843,9cyclictest181rcu_preempt07:10:052
18262997843,9cyclictest181rcu_preempt07:10:052
18262997814,35cyclictest39-21ksoftirqd/210:29:532
1825599784,38cyclictest343-21runrttasks12:19:511
1825599783,43cyclictest31580-21sendmail09:19:421
18250997857,15cyclictest524-21in:imuxsock08:59:430
18262997755,14cyclictest200-21systemd-journal09:33:582
18262997748,8cyclictest181rcu_preempt09:51:352
18262997747,13cyclictest181rcu_preempt12:28:312
18262997736,16cyclictest181rcu_preempt11:12:302
18262997722,12cyclictest181rcu_preempt12:15:062
18262997722,12cyclictest181rcu_preempt12:15:062
18255997758,12cyclictest13784-21ssh12:19:451
18255997758,12cyclictest13784-21ssh12:19:451
18255997737,34cyclictest0-21swapper/109:34:581
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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