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2025-07-01 - 01:00

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, 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 rack5slot3s.osadl.org (updated Mon Jun 30, 2025 12:44:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
140072236163,24sleep30-21swapper/307:06:473
141242235163,58sleep10-21swapper/107:08:181
122902233163,58sleep20-21swapper/207:05:042
140712206129,24sleep00-21swapper/007:07:370
2280521710,4sleep31436899cyclictest09:54:513
2407221530,2sleep31436899cyclictest11:10:183
2194021390,3sleep21436299cyclictest09:50:282
1436299105102,2cyclictest0-21swapper/209:33:222
14362997471,2cyclictest0-21swapper/208:42:462
254582680,2sleep20-21swapper/211:12:052
315382650,1sleep00-21swapper/011:25:280
216642570,4sleep321667-21latency_hist07:25:023
216642570,4sleep321667-21latency_hist07:25:013
265752540,1sleep10-21swapper/107:35:151
78242530,2sleep07823-21cpuspeed_turbos09:20:190
14362994238,2cyclictest3045-21diskmemload12:22:392
14353994010,13cyclictest13419-21munin-run08:20:010
120702360,13sleep30-21swapper/311:55:213
1436899341,31cyclictest0-21swapper/310:30:363
1436899341,31cyclictest0-21swapper/310:30:353
1436899341,23cyclictest0-21swapper/310:59:213
1436899341,22cyclictest0-21swapper/310:36:043
14368993317,8cyclictest0-21swapper/312:17:433
1436899331,22cyclictest0-21swapper/311:15:433
1436899331,21cyclictest0-21swapper/310:23:123
1436899330,21cyclictest0-21swapper/311:27:593
1435399333,14cyclictest797-21munin-run09:05:010
1436899321,22cyclictest0-21swapper/310:40:443
1436899321,21cyclictest0-21swapper/311:03:483
1436899321,21cyclictest0-21swapper/309:58:103
1436899321,20cyclictest0-21swapper/309:28:503
1436899321,14cyclictest3045-21diskmemload10:54:343
1436899321,14cyclictest0-21swapper/309:35:563
14368993120,3cyclictest0-21swapper/312:14:513
14368993119,3cyclictest0-21swapper/311:06:083
14368993116,3cyclictest0-21swapper/312:27:493
14368993115,8cyclictest0-21swapper/312:31:393
1436899311,21cyclictest0-21swapper/311:31:523
1436899311,20cyclictest0-21swapper/310:04:343
1436899311,15cyclictest0-21swapper/309:45:173
1436899311,13cyclictest0-21swapper/312:35:453
1436899311,13cyclictest0-21swapper/309:41:143
1436899311,13cyclictest0-21swapper/309:33:003
1436899310,20cyclictest0-21swapper/310:49:363
1436899301,19cyclictest0-21swapper/309:15:083
1436899301,13cyclictest0-21swapper/312:00:083
1436899301,13cyclictest0-21swapper/307:14:273
1436899301,12cyclictest0-21swapper/311:49:323
1436899301,12cyclictest0-21swapper/311:40:103
1436899301,12cyclictest0-21swapper/310:17:513
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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