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2025-12-07 - 05:43

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 Dec 07, 2025 00:43:57)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3936680211959,56sleep30-21swapper/319:07:523
393667328252,10sleep10-21swapper/119:07:451
393675728054,21sleep20-21swapper/219:08:512
393678027454,14sleep00-21swapper/019:09:090
393697899262,20cyclictest138649-21taskset23:59:083
3936978992521,2cyclictest0-21swapper/323:40:003
393697899251,19cyclictest191869-21taskset00:32:433
393697899251,12cyclictest147200-21turbostat00:05:013
3936978992421,1cyclictest0-21swapper/319:30:003
3936978992418,3cyclictest0-21swapper/322:35:153
3936978992411,9cyclictest4135346-21taskset21:52:363
393697899238,9cyclictest4082474-21taskset21:20:013
3936978992318,2cyclictest0-21swapper/323:34:593
3936978992311,8cyclictest4157505-21chrt22:05:393
393697899227,6cyclictest51623-21taskset23:03:563
393697899222,15cyclictest178294-21turbostat00:25:003
393697899222,14cyclictest52286-21sleep23:09:553
393697899222,13cyclictest2315-21taskset22:30:323
3936978992218,2cyclictest0-21swapper/300:13:273
3936978992217,3cyclictest0-21swapper/322:50:203
393697899212,13cyclictest4081483-21taskset21:18:493
393697899212,12cyclictest4144782-21taskset22:00:063
393697899212,12cyclictest27705-21taskset22:48:163
3936978992119,1cyclictest0-21swapper/319:45:013
3936978992118,1cyclictest0-21swapper/319:50:133
3936978992116,3cyclictest0-21swapper/321:45:183
3936978992113,5cyclictest66550irq/131-enp1s0-TxRx-321:10:243
41842042201,14sleep14185033-21cut22:25:181
41753512200,2sleep20-21swapper/222:19:462
393697899205,12cyclictest4104540-21taskset21:33:123
393697899203,13cyclictest0-21swapper/300:17:493
393697899202,13cyclictest4097464-21taskset21:29:193
393697899202,12cyclictest4175789-21taskset22:20:023
393697899201,15cyclictest4066342-21turbostat21:10:003
393697899201,15cyclictest4023693-21taskset20:28:383
393697899201,14cyclictest123516-21chrt23:50:073
393697899192,12cyclictest4174032-21taskset22:17:213
393697899192,12cyclictest4167302-21taskset22:14:093
393697899192,12cyclictest41553-21taskset22:55:263
3936978991916,2cyclictest0-21swapper/320:10:183
3936978991916,1cyclictest0-21swapper/322:25:183
3936978991915,2cyclictest0-21swapper/321:40:003
3936978991915,2cyclictest0-21swapper/300:35:163
393697899191,2cyclictest0-21swapper/323:26:513
393697899191,15cyclictest115463-21turbostat23:45:013
393697899191,14cyclictest81356-21chrt23:20:513
393697899191,14cyclictest0-21swapper/323:11:003
393697899191,13cyclictest115779-21chrt23:45:093
393697899191,11cyclictest4033697-21taskset20:35:203
3936978991910,4cyclictest685002sleep323:15:153
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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