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2026-08-20 - 00:41

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #5

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 rackeslot5s.osadl.org (updated Wed Aug 19, 2026 12:44:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
25355992822,5cyclictest6711-21munin-run08:45:010
2535599280,24cyclictest0-21swapper/010:24:220
2535599270,26cyclictest0-21swapper/012:25:590
25355992620,5cyclictest24424-21ssh12:04:470
2535599260,25cyclictest0-21swapper/009:52:010
2535599260,1cyclictest0-21swapper/010:56:540
2536599250,24cyclictest0-21swapper/311:43:233
2536099250,24cyclictest18725-21diskmemload10:46:352
2536099250,24cyclictest13307-21munin-run11:55:012
25357992525,0cyclictest0-21swapper/111:11:321
25357992523,1cyclictest19168-21ssh09:37:251
25357992523,1cyclictest0-21swapper/111:35:201
25357992523,1cyclictest0-21swapper/109:44:451
25357992523,1cyclictest0-21swapper/109:11:571
2535799250,24cyclictest18725-21diskmemload10:40:481
25355992523,2cyclictest0-21swapper/009:15:150
25355992523,2cyclictest0-21swapper/009:15:150
25355992522,3cyclictest18725-21diskmemload10:25:560
25355992522,3cyclictest0-21swapper/012:13:390
25355992521,4cyclictest18725-21diskmemload09:36:520
25355992520,4cyclictest19494-21rm11:30:400
2535599250,24cyclictest30325-21ssh09:47:080
2535599250,21cyclictest30351-21ssh12:37:090
2535599250,1cyclictest0-21swapper/011:47:410
2535599250,0cyclictest0-21swapper/009:55:170
25365992423,1cyclictest21099-21ssh12:29:573
2536599240,24cyclictest0-21swapper/311:08:003
2536599240,23cyclictest18725-21diskmemload11:35:083
2536599240,23cyclictest0-21swapper/310:27:023
2536599240,1cyclictest0-21swapper/312:24:513
2536099240,23cyclictest0-21swapper/211:11:342
2536099240,22cyclictest313-21systemd-journal12:35:012
2536099240,0cyclictest0-21swapper/209:53:062
25357992423,1cyclictest27931-21ssh09:16:371
25357992423,1cyclictest27931-21ssh09:16:371
25357992423,1cyclictest0-21swapper/109:34:171
25357992422,1cyclictest12639-21latency_hist07:50:011
25357992422,1cyclictest0-21swapper/111:43:361
25357992421,2cyclictest7853-21awk07:40:001
2535799240,2cyclictest14404-21ssh10:01:201
2535799240,23cyclictest2274-21idleruntime-cro10:20:011
2535799240,23cyclictest18725-21diskmemload12:31:351
2535799240,23cyclictest12865-21ssh10:57:101
2535799240,23cyclictest0-21swapper/109:23:411
2535799240,1cyclictest0-21swapper/111:47:281
25355992424,0cyclictest0-21swapper/009:14:470
25355992423,1cyclictest0-21swapper/011:18:460
25355992422,2cyclictest0-21swapper/012:16:460
2535599242,1cyclictest21408-21sh09:40:040
25355992421,2cyclictest24668-21cron08:15:000
25355992421,2cyclictest18725-21diskmemload12:21:570
25355992420,3cyclictest0-21swapper/012:07:260
2535599240,23cyclictest4315-21awk08:40:010
2535599240,23cyclictest0-21swapper/011:41:320
2535599240,23cyclictest0-21swapper/009:26:170
2535599240,0cyclictest2214-21ssh10:19:580
2535599240,0cyclictest0-21swapper/011:10:440
25365992323,0cyclictest18725-21diskmemload09:20:373
25365992323,0cyclictest0-21swapper/310:30:523
25365992323,0cyclictest0-21swapper/309:48:393
25365992322,1cyclictest0-21swapper/309:15:063
25365992322,1cyclictest0-21swapper/309:15:063
25365992321,1cyclictest5326-21rm09:54:363
25365992321,1cyclictest18725-21diskmemload09:11:173
25365992320,2cyclictest13603-21sh10:00:193
2536599230,2cyclictest636-21ssh10:45:583
2536599230,23cyclictest0-21swapper/311:50:383
2536599230,23cyclictest0-21swapper/310:21:033
2536599230,22cyclictest7374-21rm10:52:203
2536599230,22cyclictest3144-21ssh12:13:493
2536599230,22cyclictest2301-21munin-run10:20:013
2536599230,22cyclictest21868-21ssh12:01:203
2536599230,22cyclictest18725-21diskmemload12:32:073
2536599230,22cyclictest1710-21apache209:45:003
2536599230,22cyclictest11186-21ssh09:30:143
2536599230,22cyclictest0-21swapper/310:55:113
2536599230,1cyclictest27612-21awk11:10:103
2536599230,1cyclictest27125-21awk08:20:003
2536599230,0cyclictest0-21swapper/309:59:433
25360992323,0cyclictest18725-21diskmemload12:04:512
25360992323,0cyclictest0-21swapper/210:53:502
25360992323,0cyclictest0-21swapper/209:59:122
25360992322,1cyclictest28387-21apt-get07:15:062
25360992322,1cyclictest18725-21diskmemload11:00:412
25360992322,1cyclictest18725-21diskmemload10:21:082
25360992321,1cyclictest0-21swapper/211:26:132
25360992319,4cyclictest0-21swapper/211:17:372
2536099230,23cyclictest0-21swapper/212:17:282
2536099230,23cyclictest0-21swapper/211:07:022
2536099230,23cyclictest0-21swapper/210:55:592
2536099230,23cyclictest0-21swapper/209:21:072
2536099230,22cyclictest18725-21diskmemload10:42:352
2536099230,22cyclictest11032-21ssh09:30:132
2536099230,0cyclictest0-21swapper/211:46:122
2536099230,0cyclictest0-21swapper/209:38:112
2536099230,0cyclictest0-21swapper/209:16:052
2536099230,0cyclictest0-21swapper/209:16:052
25357992323,0cyclictest18725-21diskmemload11:09:411
25357992323,0cyclictest0-21swapper/111:52:441
25357992323,0cyclictest0-21swapper/111:00:481
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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