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2026-08-24 - 05:34

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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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 100 highest latencies:
System rack5slot3s.osadl.org (updated Mon Aug 24, 2026 00:44:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
168882238162,25sleep30-21swapper/319:05:563
170322235163,24sleep10-21swapper/119:07:471
170282231163,55sleep20-21swapper/219:07:442
171342229161,55sleep00-21swapper/019:09:070
2327721300,2sleep31729799cyclictest23:00:213
2327721300,2sleep31729799cyclictest23:00:213
633621060,1sleep10-21swapper/123:35:221
2020421000,5sleep21729399cyclictest20:25:252
17293999288,3cyclictest0-21swapper/219:47:452
17293996455,3cyclictest0-21swapper/220:15:022
235712620,5sleep2311ktimersoftd/200:15:172
134682580,4sleep230-21rcuc/221:25:172
17293995249,2cyclictest0-21swapper/200:32:162
1729799341,21cyclictest0-21swapper/319:57:133
1729799340,20cyclictest0-21swapper/322:01:213
1727799334,13cyclictest18257-21awk00:05:010
1729799321,19cyclictest0-21swapper/320:00:253
1729799320,15cyclictest0-21swapper/300:23:213
1729799320,12cyclictest0-21swapper/321:11:573
1729799311,20cyclictest0-21swapper/319:44:173
1729799310,14cyclictest0-21swapper/321:50:213
1729799310,14cyclictest0-21swapper/321:50:213
1729799301,23cyclictest0-21swapper/321:19:453
1729799301,12cyclictest0-21swapper/323:09:333
1729799301,12cyclictest0-21swapper/323:09:333
17297992916,3cyclictest0-21swapper/323:26:053
1729799291,2cyclictest0-21swapper/322:54:353
1729799291,12cyclictest0-21swapper/321:45:333
1729799290,12cyclictest0-21swapper/322:27:173
1727799292,14cyclictest11980-21munin-run20:10:010
1729799281,12cyclictest0-21swapper/323:32:053
1727799289,16cyclictest31761-21munin-run20:55:010
1729799271,8cyclictest0-21swapper/319:31:233
1729799271,8cyclictest0-21swapper/319:31:233
1729799271,24cyclictest0-21swapper/323:44:573
1729799271,12cyclictest13771-21df22:40:133
1729799271,12cyclictest0-21swapper/322:56:293
1729799270,13cyclictest0-21swapper/321:29:333
1729799270,12cyclictest0-21swapper/321:59:333
1729799270,11cyclictest0-21swapper/323:49:373
1729799266,10cyclictest0-21swapper/300:05:153
1729799261,12cyclictest0-21swapper/320:50:033
1729799260,13cyclictest0-21swapper/300:35:493
1729799260,11cyclictest0-21swapper/321:31:253
1728599260,20cyclictest0-21swapper/122:35:111
1727799261,13cyclictest26767-21idleruntime-cro19:30:010
1729799258,6cyclictest180142sleep300:02:133
1729799251,9cyclictest0-21swapper/321:08:253
17297992518,2cyclictest0-21swapper/321:24:013
1729799251,13cyclictest0-21swapper/319:24:193
1729799251,13cyclictest0-21swapper/300:11:413
1729799251,11cyclictest0-21swapper/322:19:333
1729799250,11cyclictest0-21swapper/320:37:313
1729799248,3cyclictest0-21swapper/319:19:273
1729799246,3cyclictest0-21swapper/320:49:353
1729799241,12cyclictest0-21swapper/322:47:533
1729799241,12cyclictest0-21swapper/320:25:593
1729799241,12cyclictest0-21swapper/320:17:153
1729799240,17cyclictest0-21swapper/322:39:273
1729799240,12cyclictest0-21swapper/323:13:373
1729799240,10cyclictest0-21swapper/320:24:173
1729399241,3cyclictest0-21swapper/223:39:492
1727799245,16cyclictest14794-21munin-run21:30:010
17277992411,3cyclictest8589-21expr21:15:130
1729799238,3cyclictest0-21swapper/320:07:333
1729799237,3cyclictest0-21swapper/300:16:073
1729799237,2cyclictest0-21swapper/321:38:193
1729799231,13cyclictest0-21swapper/323:36:533
1729799231,13cyclictest0-21swapper/320:55:213
1729799231,10cyclictest0-21swapper/320:43:353
1729799231,10cyclictest0-21swapper/320:43:353
17285992313,5cyclictest0-21swapper/119:22:021
1727799233,11cyclictest7457-21/usr/sbin/munin23:40:110
1727799232,12cyclictest26345-21df21:55:130
1727799231,6cyclictest827-21runrttasks22:49:520
186112220,3sleep20-21swapper/220:25:012
1729799228,3cyclictest0-21swapper/323:56:353
1729799221,9cyclictest0-21swapper/320:30:393
1729799221,10cyclictest0-21swapper/319:35:473
1729799220,9cyclictest0-21swapper/319:53:233
1729799220,21cyclictest0-21swapper/323:19:213
1729399221,6cyclictest8202-21munin-plugin-st21:15:012
1729399221,3cyclictest0-21swapper/222:38:352
1728599223,12cyclictest20765-21kworker/u8:121:53:351
1728599223,12cyclictest20765-21kworker/u8:121:53:351
1728599222,7cyclictest26365-40dnf21:55:181
1728599221,18cyclictest23211-21df00:15:131
1728599221,18cyclictest19187-21chrt19:11:361
1728599221,18cyclictest124982sleep121:23:551
1728599221,12cyclictest30421-21/usr/sbin/munin22:05:241
1728599221,11cyclictest28848-21unixbench_singl00:25:281
17285992210,4cyclictest3525-21ntp_states22:15:211
1727799220,11cyclictest0-21swapper/023:22:280
1729799218,3cyclictest0-21swapper/300:27:213
1729799217,3cyclictest0-21swapper/322:14:513
1729799215,3cyclictest0-21swapper/319:27:553
1729799211,12cyclictest0-21swapper/323:51:573
1729799211,12cyclictest0-21swapper/322:31:013
1729799211,10cyclictest0-21swapper/321:40:513
1729399211,8cyclictest0-21swapper/221:16:362
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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