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2026-09-01 - 18:45

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 Sep 01, 2026 12:44:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
101742240165,22sleep30-21swapper/307:09:433
99892229159,57sleep20-21swapper/207:07:212
99682224195,19sleep10-21swapper/107:07:051
98902202165,25sleep00-21swapper/007:06:020
10295998178,2cyclictest0-21swapper/212:32:262
311542560,4sleep11028999cyclictest11:35:171
207052530,3sleep081ktimersoftd/011:10:240
51722450,1sleep10-21swapper/111:50:131
1028999361,25cyclictest0-21swapper/108:14:121
1029999352,11cyclictest11462-21/usr/sbin/munin12:05:253
1028999351,28cyclictest0-21swapper/112:31:201
10282993510,13cyclictest24429-21idleruntime-cro12:35:010
1029999342,11cyclictest1553-21/usr/sbin/munin11:40:243
1029999341,25cyclictest0-21swapper/309:47:203
1029999340,6cyclictest8564-1kworker/u9:110:11:303
1028999341,25cyclictest0-21swapper/111:17:061
1028999341,24cyclictest0-21swapper/107:59:541
1028999341,11cyclictest0-21swapper/111:57:241
178562330,2sleep10-21swapper/109:50:211
10295993330,2cyclictest0-21swapper/211:37:442
1028999331,24cyclictest0-21swapper/110:50:381
1028299339,11cyclictest26001-21munin-run11:25:010
1029999321,25cyclictest0-21swapper/308:43:293
1029999321,24cyclictest0-21swapper/310:32:453
1029999321,23cyclictest0-21swapper/311:34:363
1029999321,15cyclictest0-21swapper/310:23:163
1029999321,14cyclictest0-21swapper/310:25:083
1028999321,23cyclictest0-21swapper/108:37:161
1028999320,24cyclictest0-21swapper/108:27:021
10299993115,3cyclictest10861-21cpu10:50:123
1029999311,16cyclictest0-21swapper/312:35:433
1029999311,15cyclictest0-21swapper/309:15:323
1029999311,13cyclictest14528-21grep10:55:273
1029999311,12cyclictest27899-21grep07:45:263
1029999310,23cyclictest0-21swapper/311:26:563
1029999310,16cyclictest0-21swapper/308:45:133
1029999310,16cyclictest0-21swapper/308:45:123
1029999310,12cyclictest0-21swapper/311:00:123
1028299318,11cyclictest31348-21diskmemload10:25:010
10299993013,4cyclictest21529-21grep07:30:263
1029999301,14cyclictest0-21swapper/309:36:243
1029999301,13cyclictest5529-21hddtemp_smartct11:50:163
1029999301,13cyclictest0-21swapper/308:35:053
1029999300,15cyclictest0-21swapper/312:04:123
1029999300,14cyclictest0-21swapper/309:28:283
1029999300,12cyclictest0-21swapper/309:55:123
1029999300,12cyclictest0-21swapper/309:55:123
1028999301,23cyclictest0-21swapper/110:47:261
1028999301,13cyclictest0-21swapper/107:27:491
1028999301,12cyclictest0-21swapper/107:32:431
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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