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2026-04-03 - 12:55

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 Fri Apr 03, 2026 00:44:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
6125992724,2cyclictest13317-21cron19:25:013
612599260,25cyclictest20813-21sh21:30:353
611499260,25cyclictest1039-21cstates23:18:391
612599250,24cyclictest23848-21sh22:37:353
612599250,24cyclictest0-21swapper/323:08:443
6122992520,2cyclictest4766-21rm21:14:522
6122992518,6cyclictest0-21swapper/221:24:402
612299251,23cyclictest7498-21rm23:23:452
612299250,24cyclictest0-21swapper/223:29:442
6114992523,1cyclictest0-21swapper/123:33:471
611499250,1cyclictest0-21swapper/122:52:581
611199253,1cyclictest62550irq/127-eno122:27:160
611199250,3cyclictest15081-21sh21:25:000
611199250,24cyclictest0-21swapper/023:23:000
611199250,24cyclictest0-21swapper/022:45:500
611199250,24cyclictest0-21swapper/022:38:390
6125992423,1cyclictest34-21ksoftirqd/321:17:243
6125992421,2cyclictest1572-21ssh22:47:283
612599240,24cyclictest0-21swapper/300:27:423
612599240,23cyclictest32221-21diskmemload23:10:013
612599240,23cyclictest13863-21grep21:55:013
612599240,23cyclictest0-21swapper/322:52:323
612599240,23cyclictest0-21swapper/321:23:273
6122992422,1cyclictest313-21systemd-journal00:35:002
6122992420,3cyclictest13575-21apt-get20:33:372
612299240,24cyclictest32221-21diskmemload00:09:472
612299240,0cyclictest7393-21apt-get00:28:372
6114992424,0cyclictest0-21swapper/100:33:351
6114992423,1cyclictest29853-21ssh23:46:161
6114992422,1cyclictest26743-21ssh22:39:291
611499240,24cyclictest32221-21diskmemload21:30:431
611499240,24cyclictest0-21swapper/100:27:481
611499240,1cyclictest7780-21ssh23:56:251
611499240,0cyclictest0-21swapper/121:51:451
611199242,21cyclictest32221-21diskmemload21:50:190
611199240,24cyclictest0-21swapper/023:52:170
611199240,23cyclictest32221-21diskmemload23:01:010
611199240,23cyclictest32221-21diskmemload22:16:060
611199240,23cyclictest32221-21diskmemload22:01:070
611199240,23cyclictest0-21swapper/000:18:400
611199240,1cyclictest32221-21diskmemload22:21:130
6125992323,0cyclictest0-21swapper/323:49:063
6125992321,1cyclictest32221-21diskmemload00:20:203
6125992321,1cyclictest24677-21sh22:05:593
6125992321,1cyclictest0-21swapper/321:26:323
6125992320,2cyclictest20017-21diskmemload23:36:483
612599230,2cyclictest5959-21ssh23:23:363
612599230,23cyclictest0-21swapper/323:19:153
612599230,23cyclictest0-21swapper/322:40:583
612599230,23cyclictest0-21swapper/322:25:163
612599230,22cyclictest8768-21ssh22:22:493
612599230,22cyclictest32221-21diskmemload22:30:353
612599230,22cyclictest26953-1kworker/u9:021:41:453
612599230,22cyclictest17347-21ssh21:58:443
612599230,22cyclictest16072-21sh23:01:053
612599230,22cyclictest0-21swapper/323:51:143
612599230,22cyclictest0-21swapper/319:48:373
612599230,1cyclictest0-21swapper/300:02:163
6122992323,0cyclictest0-21swapper/223:12:092
6122992323,0cyclictest0-21swapper/222:11:112
6122992320,2cyclictest22637-21latency_hist20:50:002
6122992320,0cyclictest0-21swapper/200:00:052
612299230,23cyclictest0-21swapper/223:50:322
612299230,23cyclictest0-21swapper/223:31:382
612299230,23cyclictest0-21swapper/222:28:482
612299230,22cyclictest4964-21latency_hist22:50:012
612299230,22cyclictest24461-21rm23:40:452
612299230,22cyclictest0-21swapper/221:43:462
612299230,1cyclictest0-21swapper/221:26:082
612299230,0cyclictest32221-21diskmemload22:34:052
612299230,0cyclictest32221-21diskmemload22:07:462
6114992323,0cyclictest0-21swapper/123:27:361
6114992323,0cyclictest0-21swapper/122:31:351
6114992323,0cyclictest0-21swapper/121:40:311
6114992323,0cyclictest0-21swapper/100:00:451
6114992322,1cyclictest22397-21ssh23:08:121
6114992321,1cyclictest0-21swapper/121:35:541
6114992320,2cyclictest505-21ssh21:10:541
611499230,2cyclictest3372-21idleruntime-cro20:10:011
611499230,2cyclictest13382-21ssh21:23:411
611499230,23cyclictest32221-21diskmemload22:43:331
611499230,23cyclictest0-21swapper/122:11:111
611499230,22cyclictest8988-21rm22:23:091
611499230,22cyclictest3824-21ssh23:20:081
611499230,22cyclictest32221-21diskmemload21:25:521
611499230,22cyclictest23684-21rm00:12:211
611499230,22cyclictest23684-21rm00:12:211
611499230,22cyclictest20406-21sh22:02:171
611499230,22cyclictest14803-21ssh21:56:241
611499230,22cyclictest0-21swapper/119:38:361
611499230,0cyclictest0-21swapper/123:42:591
611499230,0cyclictest0-21swapper/122:16:241
611499230,0cyclictest0-21swapper/121:17:181
6111992323,0cyclictest32221-21diskmemload00:25:480
6111992323,0cyclictest0-21swapper/023:57:470
6111992323,0cyclictest0-21swapper/023:40:450
6111992323,0cyclictest0-21swapper/023:26:470
6111992323,0cyclictest0-21swapper/021:47:580
6111992323,0cyclictest0-21swapper/021:14:010
6111992323,0cyclictest0-21swapper/000:11:430
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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