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2026-08-01 - 20:06

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 Sat Aug 01, 2026 12:44:21)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
31475992621,4cyclictest0-21swapper/209:49:152
3147799250,24cyclictest25214-21diskmemload12:20:363
3147599252,22cyclictest14629-21ssh10:56:082
3147599250,24cyclictest25214-21diskmemload11:32:072
3147599250,24cyclictest25214-21diskmemload09:28:002
3147599250,24cyclictest19945-21expr12:28:412
3147199250,24cyclictest25214-21diskmemload12:28:101
3146699250,24cyclictest0-21swapper/011:21:060
3146699250,24cyclictest0-21swapper/010:01:440
31477992423,1cyclictest0-21swapper/311:13:243
31477992422,1cyclictest0-21swapper/310:20:573
3147799240,24cyclictest0-21swapper/309:46:093
3147799240,23cyclictest25214-21diskmemload11:16:073
3147799240,23cyclictest20218-21tail11:58:483
3147799240,23cyclictest0-21swapper/312:06:423
3147799240,1cyclictest19355-21sh10:31:293
3147799240,0cyclictest0-21swapper/312:27:333
31475992423,1cyclictest16234-1kworker/u9:010:06:582
31475992422,1cyclictest25214-21diskmemload11:09:402
31475992422,1cyclictest0-21swapper/210:48:442
31475992422,1cyclictest0-21swapper/210:23:302
3147599240,23cyclictest0-21swapper/210:28:422
3147599240,1cyclictest0-21swapper/212:17:042
3147599240,1cyclictest0-21swapper/211:27:002
31471992424,0cyclictest0-21swapper/112:18:351
31471992423,1cyclictest883-21ssh12:10:411
3147199241,22cyclictest29324-21sh09:43:191
3147199240,24cyclictest25214-21diskmemload10:16:351
3147199240,24cyclictest0-21swapper/110:31:131
31466992423,1cyclictest0-21swapper/009:35:310
31466992422,1cyclictest31981-21rm11:40:010
31466992422,1cyclictest15980-21sh09:59:060
31466992421,2cyclictest17025-21ssh09:31:460
31466992421,2cyclictest16316-21sh11:26:210
31466992421,2cyclictest0-21swapper/010:30:370
3146699240,24cyclictest0-21swapper/012:23:450
3146699240,24cyclictest0-21swapper/012:08:250
3146699240,24cyclictest0-21swapper/009:23:260
3146699240,23cyclictest30682-21apt-get12:38:400
3146699240,23cyclictest0-21swapper/010:40:490
3146699240,1cyclictest7120-21irqstats11:18:420
3146699240,0cyclictest0-21swapper/011:52:490
31477992323,0cyclictest25214-21diskmemload09:20:193
31477992323,0cyclictest0-21swapper/312:36:303
31477992323,0cyclictest0-21swapper/312:00:033
31477992323,0cyclictest0-21swapper/311:54:233
31477992323,0cyclictest0-21swapper/310:29:083
31477992323,0cyclictest0-21swapper/310:19:493
31477992323,0cyclictest0-21swapper/309:26:353
31477992323,0cyclictest0-21swapper/309:10:023
31477992322,1cyclictest22012-21apt-get11:03:383
31477992322,0cyclictest0-21swapper/312:16:473
31477992321,1cyclictest0-21swapper/310:01:003
3147799230,2cyclictest6108-21rm11:46:223
3147799230,23cyclictest0-21swapper/309:35:413
3147799230,22cyclictest8767-21sh09:53:403
3147799230,22cyclictest4372-21dump-pmu-power09:20:013
3147799230,22cyclictest0-21swapper/311:20:293
3147799230,21cyclictest0-21swapper/311:33:093
3147799230,0cyclictest0-21swapper/310:55:313
3147799230,0cyclictest0-21swapper/310:51:103
3147799230,0cyclictest0-21swapper/309:30:493
31475992323,0cyclictest0-21swapper/212:35:382
31475992323,0cyclictest0-21swapper/212:21:002
31475992323,0cyclictest0-21swapper/211:46:212
31475992322,0cyclictest0-21swapper/211:10:382
31475992321,1cyclictest24087-21sh10:35:172
31475992321,1cyclictest0-21swapper/210:12:002
31475992321,1cyclictest0-21swapper/209:24:022
31475992320,2cyclictest510-21sh12:10:152
31475992320,2cyclictest27017-21ssh09:40:072
3147599230,23cyclictest0-21swapper/211:50:442
3147599230,23cyclictest0-21swapper/209:52:292
3147599230,22cyclictest4890-21sh11:45:002
3147599230,22cyclictest26670-21rm09:11:292
3147599230,22cyclictest25214-21diskmemload11:22:292
3147599230,22cyclictest21438-21sh09:35:112
3147599230,22cyclictest1625-21ssh10:15:242
3147599230,22cyclictest1226-21ssh09:18:012
3147599230,22cyclictest0-21swapper/210:32:132
3147599230,22cyclictest0-21swapper/209:56:322
3147599230,0cyclictest25214-21diskmemload10:50:552
31471992323,0cyclictest25214-21diskmemload11:29:171
31471992323,0cyclictest14502-21ssh10:55:581
31471992323,0cyclictest0-21swapper/112:20:161
31471992323,0cyclictest0-21swapper/111:33:391
31471992323,0cyclictest0-21swapper/111:02:011
31471992323,0cyclictest0-21swapper/110:44:101
31471992323,0cyclictest0-21swapper/109:34:561
31471992322,1cyclictest27156-21ssh11:08:071
31471992322,1cyclictest11387-21ssh11:22:521
31471992322,1cyclictest0-21swapper/109:51:521
3147199230,23cyclictest25214-21diskmemload11:12:211
3147199230,23cyclictest0-21swapper/110:47:281
3147199230,23cyclictest0-21swapper/110:05:551
3147199230,23cyclictest0-21swapper/109:25:371
3147199230,23cyclictest0-21swapper/109:23:591
3147199230,22cyclictest783-21snmpd09:10:331
3147199230,22cyclictest14800-21sh10:28:261
3147199230,0cyclictest25214-21diskmemload11:47:501
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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