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2025-12-11 - 08:11

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, 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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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 rack3slot3s.osadl.org (updated Thu Dec 11, 2025 00:43:58)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
505164213159,67sleep30-21swapper/319:05:083
97058921120,3sleep0221rcuc/000:30:170
50978428153,20sleep00-21swapper/019:05:460
50995628064,9sleep20-21swapper/219:07:562
51009627955,19sleep10-21swapper/119:09:431
510258992522,1cyclictest0-21swapper/323:40:003
510258992521,2cyclictest0-21swapper/323:24:593
51025899242,16cyclictest764649-21taskset22:25:133
51025899242,14cyclictest718584-21taskset21:55:183
510258992421,1cyclictest0-21swapper/322:48:543
510258992421,1cyclictest0-21swapper/321:50:193
510258992419,2cyclictest0-21swapper/323:55:233
51025899232,13cyclictest973147-21taskset00:30:323
51025899229,7cyclictest821649-21taskset22:59:363
51025899221,17cyclictest0-21swapper/322:11:183
510258992210,9cyclictest755913-21turbostat22:24:543
510258992118,1cyclictest0-21swapper/321:34:203
510258992118,1cyclictest0-21swapper/321:34:193
510258992117,2cyclictest0-21swapper/322:05:223
510258992116,2cyclictest0-21swapper/322:15:253
51025899211,16cyclictest564640-21taskset19:55:243
9666142201,2sleep10-21swapper/100:27:461
51025899202,13cyclictest958458-21taskset00:21:263
51025899202,12cyclictest976182-21taskset00:35:053
51025899202,12cyclictest806052-21taskset22:50:013
51025899202,12cyclictest706287-21taskset21:50:013
51025899202,11cyclictest567454-21taskset20:00:183
510258992017,1cyclictest0-21swapper/321:25:173
510258992017,1cyclictest0-21swapper/321:00:263
510258992017,1cyclictest0-21swapper/320:50:183
510258992017,1cyclictest0-21swapper/319:40:013
510258992017,1cyclictest0-21swapper/300:05:163
51025899201,15cyclictest515509-21turbostat19:15:003
51025899201,14cyclictest656585-21chrt21:20:143
510258991916,1cyclictest0-21swapper/323:42:063
510258991916,1cyclictest0-21swapper/319:15:163
510258991915,2cyclictest0-21swapper/323:15:283
510258991915,2cyclictest0-21swapper/322:30:013
510258991915,2cyclictest0-21swapper/300:15:003
510258991913,3cyclictest0-21swapper/323:25:173
51025899191,13cyclictest875796-21chrt23:30:223
51025899191,13cyclictest838543-21chrt23:10:063
51025899191,13cyclictest644606-21chrt21:10:363
51025899190,17cyclictest0-21swapper/321:19:183
9604272181,8sleep2960437-21ssh00:25:062
9343442181,10sleep1639289-21diskmemload00:06:051
7910102181,9sleep20-21swapper/222:40:152
51025899182,11cyclictest729522-21taskset22:02:433
510258991815,2cyclictest0-21swapper/320:55:183
510258991814,2cyclictest0-21swapper/300:15:183
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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