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2025-11-30 - 03:31

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 Sun Nov 30, 2025 00:43:58)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
828302212265,53sleep30-21swapper/319:05:383
92068821140,2sleep00-21swapper/020:30:270
82852828454,9sleep20-21swapper/219:08:302
82843328453,9sleep10-21swapper/119:07:221
82862028162,13sleep00-21swapper/019:09:410
828771993632,2cyclictest0-21swapper/319:59:593
828771992824,2cyclictest0-21swapper/323:30:233
828771992522,1cyclictest0-21swapper/323:40:163
828771992421,1cyclictest0-21swapper/320:09:593
12581302241,3sleep00-21swapper/000:18:510
82877199232,15cyclictest1207593-21taskset23:45:223
82877199222,15cyclictest1187644-21taskset23:35:113
828771992218,3cyclictest0-21swapper/322:55:013
828771992218,2cyclictest0-21swapper/300:35:143
828771992218,2cyclictest0-21swapper/300:35:143
828771992213,5cyclictest9743582sleep321:19:303
82877199221,16cyclictest1126881-21chrt22:55:193
82877199215,13cyclictest1005322-21taskset21:38:573
82877199212,14cyclictest1247844-21taskset00:10:233
82877199212,12cyclictest1097236-21taskset22:36:343
828771992117,2cyclictest0-21swapper/322:27:473
828771992111,6cyclictest0-21swapper/322:25:013
828771992110,7cyclictest1279341-21taskset00:32:163
82877199210,17cyclictest947277-21chrt20:55:443
82877199210,16cyclictest10202732sleep321:47:283
11228692211,12sleep2958484-21diskmemload22:53:462
82877199202,13cyclictest1090060-21taskset22:32:423
82877199202,12cyclictest1217346-21taskset23:52:073
82877199202,12cyclictest1060667-21taskset22:15:093
828771992017,1cyclictest0-21swapper/323:00:263
828771992016,2cyclictest0-21swapper/322:10:173
828771992016,2cyclictest0-21swapper/300:20:233
828771992015,2cyclictest0-21swapper/323:25:453
828771992012,5cyclictest66550irq/131-enp1s0-TxRx-321:50:293
828771992012,5cyclictest66550irq/131-enp1s0-TxRx-321:25:283
82877199201,15cyclictest1106268-21chrt22:43:163
12101232201,4sleep1958484-21diskmemload23:48:251
82877199197,8cyclictest990880-21chrt21:30:123
82877199192,13cyclictest1139916-21chrt23:05:133
82877199192,12cyclictest1234494-21taskset00:03:223
82877199192,12cyclictest1169767-21taskset23:22:253
82877199192,12cyclictest1012395-21taskset21:42:553
828771991914,2cyclictest0-21swapper/300:15:173
828771991913,3cyclictest888990-21taskset20:00:413
82877199191,14cyclictest981249-21chrt21:22:143
82877199191,14cyclictest0-21swapper/322:45:253
82877199191,14cyclictest0-21swapper/322:45:243
82877199191,13cyclictest959144-21taskset21:10:153
82877199191,11cyclictest854585-21taskset19:30:193
82877199191,11cyclictest1151404-21taskset23:10:183
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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