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2026-10-21 - 00:11

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 Tue Oct 20, 2026 12:44:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
237232239163,24sleep20-21swapper/207:07:492
237542236165,58sleep30-21swapper/307:08:153
217052223193,20sleep10-21swapper/107:05:021
236692202165,25sleep00-21swapper/007:07:060
2556821800,4sleep32398999cyclictest07:10:273
1329621480,4sleep12397799cyclictest09:10:161
2337821400,4sleep32398999cyclictest08:20:143
90502550,1sleep09049-21head07:45:260
67662540,2sleep30-21swapper/307:40:213
64652510,1sleep10-21swapper/111:20:231
92952490,2sleep10-21swapper/109:00:171
23985994839,8cyclictest0-21swapper/210:34:122
123112440,1sleep30-21swapper/311:35:173
23985993430,3cyclictest0-21swapper/211:06:452
2397799341,26cyclictest0-21swapper/110:41:511
170362330,4sleep32398999cyclictest09:19:363
2398599311,16cyclictest246332sleep212:01:262
2397799310,5cyclictest0-21swapper/108:49:361
2397799310,24cyclictest0-21swapper/109:21:361
2397799310,23cyclictest0-21swapper/112:06:521
2397799310,23cyclictest0-21swapper/111:27:441
2397799310,23cyclictest0-21swapper/109:28:161
2397799300,5cyclictest0-21swapper/110:59:391
2396999303,13cyclictest25896-21perf09:40:000
2397799280,22cyclictest0-21swapper/109:49:471
2397799280,21cyclictest0-21swapper/111:13:431
2397799280,20cyclictest0-21swapper/107:25:401
2397799280,12cyclictest0-21swapper/107:42:151
2397799280,11cyclictest0-21swapper/107:13:351
2397799280,10cyclictest0-21swapper/111:49:561
233412280,3sleep20-21swapper/210:45:202
2397799271,11cyclictest0-21swapper/112:26:111
2397799271,11cyclictest0-21swapper/112:26:111
2397799271,11cyclictest0-21swapper/108:36:231
2397799271,10cyclictest0-21swapper/110:03:191
2397799271,10cyclictest0-21swapper/110:03:191
2397799270,16cyclictest0-21swapper/110:52:551
2397799270,16cyclictest0-21swapper/109:19:081
2397799270,11cyclictest0-21swapper/111:00:191
2396999272,14cyclictest12069-21munin-run07:55:010
2396999271,12cyclictest30278-21munin-run09:50:000
2397799261,8cyclictest0-21swapper/110:07:031
2397799261,11cyclictest0-21swapper/111:38:161
2397799260,9cyclictest0-21swapper/111:55:121
2397799260,9cyclictest0-21swapper/111:54:401
2397799260,8cyclictest0-21swapper/109:05:081
2397799260,13cyclictest0-21swapper/111:40:241
2397799260,12cyclictest0-21swapper/112:04:481
2397799260,11cyclictest0-21swapper/112:32:231
2397799260,11cyclictest0-21swapper/108:07:511
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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