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2026-08-17 - 23:33

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #1, slot #6

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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  Intel
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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
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack1slot6s.osadl.org (updated Mon Aug 17, 2026 12:43:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2194991130,8rtkit-daemon0-21swapper/110:04:041
22169991105,51cyclictest0-21swapper/109:14:321
22170999934,12cyclictest0-21swapper/211:04:262
2217099985,27cyclictest0-21swapper/208:09:302
2216799984,86cyclictest0-21swapper/008:06:260
2217099978,31cyclictest0-21swapper/209:41:422
2217099978,31cyclictest0-21swapper/209:41:422
2217099964,13cyclictest0-21swapper/209:52:572
2216799966,81cyclictest0-21swapper/009:34:240
2216799964,74cyclictest0-21swapper/009:49:320
272672950,6sleep20-21swapper/207:09:472
2217099954,39cyclictest0-21swapper/208:04:392
2216799954,82cyclictest0-21swapper/008:14:150
22170999435,14cyclictest0-21swapper/208:29:452
2217099934,44cyclictest0-21swapper/209:29:392
219499930,5rtkit-daemon2193-21rtkit-daemon08:22:231
22170999239,46cyclictest0-21swapper/210:54:242
22170999236,13cyclictest0-21swapper/210:29:262
2216799924,80cyclictest0-21swapper/011:01:110
2216799924,80cyclictest0-21swapper/011:01:110
2216799924,54cyclictest0-21swapper/007:09:320
2216799924,53cyclictest0-21swapper/010:34:160
22167999210,66cyclictest7374-21missed_timers08:29:380
2216799915,69cyclictest0-21swapper/009:59:220
2216799914,80cyclictest0-21swapper/007:59:220
2216799914,80cyclictest0-21swapper/006:54:390
2216799914,80cyclictest0-21swapper/006:54:390
2216799914,79cyclictest0-21swapper/009:21:400
2216799914,79cyclictest0-21swapper/008:34:440
2216799914,58cyclictest0-21swapper/009:29:310
2216799913,80cyclictest2693-21missed_timers10:49:340
2216799913,80cyclictest0-21swapper/011:22:270
2216799904,79cyclictest0-21swapper/010:47:550
2216799904,78cyclictest0-21swapper/009:19:060
2216799903,80cyclictest0-21swapper/007:59:090
2216799903,79cyclictest0-21swapper/008:49:420
2216799903,51cyclictest0-21swapper/010:16:520
2216799903,51cyclictest0-21swapper/010:16:520
2216799903,51cyclictest0-21swapper/008:41:350
2216799899,65cyclictest16094-21runrttasks10:20:300
2216799894,78cyclictest0-21swapper/011:12:550
2216799894,67cyclictest0-21swapper/008:18:010
2216799894,67cyclictest0-21swapper/008:18:010
2216799894,53cyclictest0-21swapper/010:07:180
2216799894,52cyclictest0-21swapper/009:54:220
2216799893,79cyclictest0-21swapper/009:39:250
2216799893,79cyclictest0-21swapper/009:39:250
2216799893,78cyclictest0-21swapper/010:54:420
2217099884,42cyclictest0-21swapper/208:54:402
2217099884,42cyclictest0-21swapper/208:54:402
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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