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2026-09-17 - 12:03

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #2

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 50 highest latencies:
System rack5slot2s.osadl.org (updated Thu Sep 17, 2026 00:46:02)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
18221432254203,35sleep70-21swapper/718:24:599
18220672249159,31sleep90-21swapper/918:23:4111
18222902247190,38sleep80-21swapper/818:27:3010
18222732246192,38sleep40-21swapper/418:27:126
18220102235184,34sleep60-21swapper/618:22:428
18221742234176,37sleep110-21swapper/1118:25:313
18220422224174,33sleep100-21swapper/1018:23:132
18222612221164,40sleep50-21swapper/518:27:007
18222432214173,28sleep10-21swapper/118:26:421
18220602207164,29sleep20-21swapper/218:23:324
18221262205164,28sleep30-21swapper/318:24:415
18221362203179,14sleep00-21swapper/018:24:520
182257799200,18cyclictest1843111-21taskset20:12:385
182257799190,6cyclictest1873334-21taskset23:17:175
182257799181,16cyclictest1865181-21taskset22:27:245
182257799180,17cyclictest1883560-21chrt00:18:125
182257799180,17cyclictest1838363-21chrt19:44:255
182257799180,16cyclictest1828375-21taskset18:42:045
182257799171,3cyclictest0-21swapper/321:40:185
182257799171,14cyclictest0-21swapper/321:51:315
182257799171,14cyclictest0-21swapper/321:15:545
1822577991710,5cyclictest1833031-21chrt19:11:405
182257799170,16cyclictest1858808-21taskset21:49:565
1822577991613,2cyclictest0-21swapper/319:27:225
182257799161,2cyclictest0-21swapper/321:04:355
182257799161,2cyclictest0-21swapper/319:34:225
182257799161,2cyclictest0-21swapper/300:22:425
182257799161,14cyclictest0-21swapper/322:17:415
182257799161,14cyclictest0-21swapper/322:03:115
182257799160,3cyclictest1855760-21chrt21:28:425
182257799160,14cyclictest1865994-21chrt22:32:095
182257799160,14cyclictest0-21swapper/322:19:155
182257799160,14cyclictest0-21swapper/322:10:195
1822577991513,1cyclictest0-21swapper/323:27:485
1822577991513,1cyclictest0-21swapper/300:35:265
182257799151,13cyclictest0-21swapper/323:38:255
182257799151,12cyclictest0-21swapper/323:32:265
182257799151,10cyclictest0-21swapper/323:59:535
182257799150,2cyclictest0-21swapper/321:24:275
182257799150,2cyclictest0-21swapper/321:17:485
182257799150,2cyclictest0-21swapper/320:59:315
182257799150,2cyclictest0-21swapper/320:00:035
182257799150,2cyclictest0-21swapper/320:00:035
182257799150,2cyclictest0-21swapper/319:01:255
182257799150,14cyclictest1868751-21chrt22:48:245
182257799150,14cyclictest1868751-21chrt22:48:235
182257799150,14cyclictest1839382-21chrt19:49:095
182257799150,14cyclictest0-21swapper/323:10:595
182257799150,14cyclictest0-21swapper/321:58:265
182257799150,14cyclictest0-21swapper/321:07:265
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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