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2026-07-12 - 11:33

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, 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 rack0slot3s.osadl.org (updated Sun Jul 12, 2026 00:44:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
30551022263214,17sleep00-21swapper/018:30:010
30553632261214,16sleep10-21swapper/118:33:201
30553912259218,32sleep30-21swapper/318:33:403
30552642256216,17sleep20-21swapper/218:32:092
30550802248227,13sleep50-21swapper/518:29:405
30551782244217,17sleep60-21swapper/618:31:106
30551612244218,17sleep70-21swapper/718:30:537
30551302243217,17sleep40-21swapper/418:30:244
3055718993831,5cyclictest0-21swapper/000:00:200
3055749993125,4cyclictest0-21swapper/622:27:006
3055749993029,1cyclictest0-21swapper/619:52:056
305573199300,22cyclictest0-21swapper/200:18:172
3055726992822,4cyclictest3162635-21ntpq22:04:561
3055718992821,3cyclictest1390-21snmpd20:22:360
305574999260,26cyclictest0-21swapper/620:58:296
305573199260,24cyclictest0-21swapper/219:47:502
305572699260,22cyclictest0-21swapper/123:52:471
305572699260,22cyclictest0-21swapper/122:54:151
305572699260,22cyclictest0-21swapper/119:28:271
3055718992621,1cyclictest1390-21snmpd20:35:530
3055718992621,1cyclictest1390-21snmpd20:35:520
305571899260,22cyclictest0-21swapper/023:50:050
305571899260,22cyclictest0-21swapper/023:45:200
3055753992521,3cyclictest1390-21snmpd23:02:147
3055753992518,5cyclictest0-21swapper/723:21:437
3055753992518,5cyclictest0-21swapper/723:21:437
3055749992516,5cyclictest0-21swapper/620:12:386
3055744992521,3cyclictest1390-21snmpd22:29:445
3055744992521,3cyclictest1390-21snmpd20:39:325
3055744992518,5cyclictest0-21swapper/500:05:475
3055740992521,3cyclictest1390-21snmpd20:45:534
3055735992521,3cyclictest1390-21snmpd19:02:073
3055726992521,3cyclictest1390-21snmpd21:00:131
3055726992521,3cyclictest1390-21snmpd19:17:531
3055726992521,3cyclictest1390-21snmpd00:24:401
3055718992522,2cyclictest1390-21snmpd22:27:110
305571899250,23cyclictest528-21systemd-journal21:39:290
305571899250,23cyclictest3096591-21ntpq19:52:110
305571899250,23cyclictest0-21swapper/019:36:310
305571899250,23cyclictest0-21swapper/019:34:000
305571899250,22cyclictest0-21swapper/019:59:010
305571899250,22cyclictest0-21swapper/000:30:020
305575399241,22cyclictest0-21swapper/718:48:537
305575399240,22cyclictest0-21swapper/723:22:367
305575399240,22cyclictest0-21swapper/723:22:367
305575399240,22cyclictest0-21swapper/722:32:307
3055749992417,5cyclictest0-21swapper/619:41:126
305574999240,2cyclictest0-21swapper/600:06:436
305574999240,22cyclictest0-21swapper/621:48:006
305574999240,22cyclictest0-21swapper/620:33:406
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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