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2026-03-13 - 13:21

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #3

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 rack5slot3s.osadl.org (updated Fri Mar 13, 2026 00:44:28)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
21972183108,25sleep10-21swapper/119:09:371
21162179101,23sleep20-21swapper/219:08:332
21592177107,25sleep00-21swapper/019:09:070
14662176123,42sleep30-21swapper/319:05:243
3197721740,4sleep2232099cyclictest22:40:222
2327995955,3cyclictest0-21swapper/319:24:313
167532560,3sleep20-21swapper/219:40:152
122592550,1sleep30-21swapper/321:55:243
95022500,4sleep1231499cyclictest21:50:161
149382480,4sleep339-21rcuc/322:01:583
317972450,1sleep30-21swapper/322:40:193
2327994025,3cyclictest0-21swapper/320:00:413
231499402,18cyclictest10972-21kworker/1:023:00:271
232799391,29cyclictest0-21swapper/322:30:493
232799391,29cyclictest0-21swapper/300:04:133
2327993817,13cyclictest0-21swapper/322:18:153
232799381,27cyclictest0-21swapper/319:58:493
2320993813,3cyclictest9217-21awk23:05:012
2306993810,13cyclictest10784-21munin-run21:55:010
232799371,27cyclictest0-21swapper/323:18:333
232799371,25cyclictest0-21swapper/322:35:293
232799371,25cyclictest0-21swapper/322:11:353
2327993712,3cyclictest496-21jbd2/dm-0-819:46:053
232799371,22cyclictest0-21swapper/319:27:293
230699378,14cyclictest12037-21munin-run00:25:010
232799361,22cyclictest0-21swapper/320:37:373
232799361,20cyclictest0-21swapper/300:17:513
232799351,28cyclictest0-21swapper/321:27:553
232799351,27cyclictest0-21swapper/322:05:513
232799351,23cyclictest0-21swapper/322:21:333
232799351,21cyclictest0-21swapper/320:09:033
232799351,18cyclictest0-21swapper/320:14:463
230699351,17cyclictest0-21swapper/021:09:110
304642340,4sleep20-21swapper/220:10:172
232799342,22cyclictest823-21snmpd23:31:533
232799341,28cyclictest0-21swapper/323:47:533
232799341,20cyclictest0-21swapper/323:25:533
232799341,20cyclictest0-21swapper/323:25:533
232799341,20cyclictest0-21swapper/320:46:473
230699341,15cyclictest0-21swapper/020:10:530
232799331,30cyclictest0-21swapper/319:50:533
232799331,30cyclictest0-21swapper/319:50:533
232799331,25cyclictest0-21swapper/323:51:353
232799331,25cyclictest0-21swapper/300:08:313
232799331,23cyclictest0-21swapper/322:57:513
232799331,20cyclictest0-21swapper/323:59:333
232799331,20cyclictest0-21swapper/321:47:053
232799331,20cyclictest0-21swapper/321:22:433
232799331,19cyclictest0-21swapper/323:35:553
232799331,18cyclictest0-21swapper/321:44:533
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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