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2026-05-05 - 17:58

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, slot #4

Rack #0/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #1/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #2/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #3/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #4/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #5/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #6/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #7/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #8/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #9/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #a/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #b/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #c/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #d/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #e/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #f/#0 #1 #2 #3 #4 #5 #6 #7 #8 
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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

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 rack7slot4s.osadl.org (updated Tue May 05, 2026 12:45:13)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
11748996644,14cyclictest35966irq/58-eth011:30:133
1165699606,33cyclictest10741-21ssh09:35:140
1168999594,41cyclictest3319-21ssh10:35:121
1165699572,11cyclictest630-21Async09:36:310
1173299551,35cyclictest25084-21ssh09:25:142
11689995215,26cyclictest21-21ksoftirqd/112:30:131
11732994929,11cyclictest131rcu_preempt09:10:132
1168999492,40cyclictest24978-21ssh11:05:131
1165699465,37cyclictest1571-21ssh11:10:110
1168999442,28cyclictest24829-21ssh12:35:121
11732994322,14cyclictest0-21swapper/210:35:122
11689994320,10cyclictest131rcu_preempt09:30:121
1165699412,36cyclictest12393-21ssh10:40:140
1168999402,28cyclictest21-21ksoftirqd/107:45:131
1165699404,26cyclictest26725-21ssh10:30:130
1168999392,30cyclictest5280-21ssh09:55:131
1168999381,31cyclictest12384-21ssh12:10:131
1168999381,31cyclictest12384-21ssh12:10:131
1168999374,23cyclictest30391-21ssh10:50:121
1174899363,17cyclictest35966irq/58-eth010:50:133
1165699360,28cyclictest0-21swapper/007:35:120
1174899351,20cyclictest35966irq/58-eth012:20:133
1168999354,24cyclictest28534-21ssh11:25:131
1165699352,27cyclictest32119-21ssh10:15:100
1174899343,14cyclictest35966irq/58-eth007:45:133
11689993421,8cyclictest23201-21ssh11:40:121
1174899332,19cyclictest0-21swapper/309:55:133
1165699332,25cyclictest16018-21ssh09:20:140
1174899322,14cyclictest35966irq/58-eth010:15:093
1168999325,7cyclictest131rcu_preempt07:15:131
1165699325,24cyclictest3363-21ssh12:05:120
1165699325,24cyclictest3363-21ssh12:05:120
1174899312,16cyclictest35966irq/58-eth008:05:143
1174899312,16cyclictest35966irq/58-eth008:05:133
11748993120,4cyclictest0-21swapper/311:10:143
11748993115,8cyclictest35966irq/58-eth010:40:143
1168999311,22cyclictest21365-21ssh10:45:121
1165699311,23cyclictest32213-21rm11:45:130
1174899303,22cyclictest35966irq/58-eth011:15:113
1173299301,4cyclictest0-21swapper/211:05:132
1165699302,22cyclictest672-21ssh12:39:360
11656993018,6cyclictest0-21swapper/012:15:110
1174899292,16cyclictest35966irq/58-eth010:20:113
1173299295,15cyclictest27346irq/40-dwc2_hso09:45:132
1173299294,11cyclictest0-21swapper/208:25:132
1173299291,11cyclictest5149-21ssh11:30:122
11689992916,7cyclictest0-21swapper/109:25:151
1173299284,17cyclictest17795-21ssh11:55:142
1173299282,20cyclictest0-21swapper/208:05:152
1173299282,20cyclictest0-21swapper/208:05:152
1173299282,14cyclictest19578-21ssh11:20:122
1173299282,14cyclictest19578-21ssh11:20:122
11689992819,7cyclictest21-21ksoftirqd/112:15:121
1174899273,15cyclictest0-21swapper/311:25:143
1173299279,10cyclictest27787-21kworker/2:111:25:132
1173299272,19cyclictest0-21swapper/208:40:152
1173299272,11cyclictest0-21swapper/207:25:162
1173299271,23cyclictest30393-21ssh12:20:122
1168999272,19cyclictest8757-21ssh10:20:121
1165699272,21cyclictest26785-21ssh12:00:130
1165699272,17cyclictest17810-21ssh11:35:240
11656992710,13cyclictest19587-21diskmemload11:20:130
11656992710,13cyclictest19587-21diskmemload11:20:120
1174899265,15cyclictest35966irq/58-eth010:30:133
1174899264,18cyclictest35966irq/58-eth011:35:123
1173299263,16cyclictest27346irq/40-dwc2_hso08:45:132
1173299262,9cyclictest0-21swapper/209:30:132
1173299262,20cyclictest0-21swapper/211:45:132
1173299262,12cyclictest5289-21ssh09:55:142
1173299262,10cyclictest0-21swapper/208:55:142
1173299261,22cyclictest27677-21grep08:00:152
1168999265,15cyclictest21-21ksoftirqd/111:30:131
1168999261,18cyclictest18700-21ssh10:05:131
1173299252,19cyclictest0-21swapper/208:35:122
11732992513,9cyclictest21389-21ssh12:31:172
11732992512,9cyclictest17710-21/usr/sbin/munin10:25:242
11732992512,9cyclictest17710-21/usr/sbin/munin10:25:242
1173299251,21cyclictest29956-21ssh09:10:012
1173299240,17cyclictest12303-21ls11:50:242
1168999243,15cyclictest201rcuc/110:25:131
1168999243,15cyclictest201rcuc/110:25:121
1168999242,18cyclictest3396-21ssh11:45:251
11689992413,5cyclictest211ksoftirqd/110:40:141
1168999241,16cyclictest26715-21ssh10:30:121
11656992411,3cyclictest131rcu_preempt09:45:290
1174899233,13cyclictest0-21swapper/312:30:143
11748992318,3cyclictest321rcuc/307:20:023
11748992317,4cyclictest321rcuc/310:57:583
11748992311,7cyclictest0-21swapper/312:00:123
1173299234,9cyclictest30396-21ssh10:50:132
1173299232,6cyclictest0-21swapper/211:40:142
1173299232,16cyclictest0-21swapper/212:36:352
1173299232,11cyclictest10658-21sh10:55:262
1173299231,6cyclictest0-21swapper/212:15:112
11732992312,9cyclictest16361-21ssh11:16:402
1173299231,13cyclictest30707-21ssh12:00:282
1168999232,16cyclictest10920-21apt-get08:50:121
1168999231,17cyclictest15762-21apt-get08:55:131
1165699232,14cyclictest6978-21ssh12:25:140
1174899222,6cyclictest0-21swapper/310:45:123
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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