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2026-07-21 - 13:45

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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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 50 highest latencies:
System rack5slot3s.osadl.org (updated Tue Jul 21, 2026 00:44:28)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
116892234161,23sleep10-21swapper/119:07:561
118052233162,58sleep20-21swapper/219:09:262
118412204166,25sleep30-21swapper/319:09:563
116582201164,25sleep00-21swapper/019:07:310
11943998985,3cyclictest0-21swapper/220:02:322
253292560,3sleep20-21swapper/219:35:262
84262540,2sleep30-21swapper/321:25:203
86262430,1sleep30-21swapper/322:40:163
11933993810,13cyclictest11028-21idleruntime-cro20:20:020
1193399366,14cyclictest28326-21munin-run00:40:020
1193399366,14cyclictest28326-21munin-run00:40:020
1195099351,12cyclictest24588-21ntp_states23:15:223
1193399356,13cyclictest27692-21munin-run23:25:000
1195099341,21cyclictest0-21swapper/321:15:093
1195099341,20cyclictest0-21swapper/321:05:403
1195099331,26cyclictest0-21swapper/323:38:093
1195099330,15cyclictest0-21swapper/300:35:093
1195099330,15cyclictest0-21swapper/300:35:083
11950993216,3cyclictest0-21swapper/320:38:243
11950993216,10cyclictest0-21swapper/320:00:523
1195099321,19cyclictest0-21swapper/321:10:043
1195099321,13cyclictest0-21swapper/322:54:443
1195099321,13cyclictest0-21swapper/322:09:133
11950993117,8cyclictest0-21swapper/300:18:373
11950993116,8cyclictest0-21swapper/322:39:163
11950993115,8cyclictest0-21swapper/323:05:483
1195099311,21cyclictest0-21swapper/323:55:373
1195099310,18cyclictest0-21swapper/320:33:083
1195099310,14cyclictest0-21swapper/323:42:453
11950993012,3cyclictest0-21swapper/300:31:213
1195099301,20cyclictest0-21swapper/322:27:083
1195099301,20cyclictest0-21swapper/320:49:483
1195099301,13cyclictest0-21swapper/321:58:293
1195099300,14cyclictest0-21swapper/321:50:173
1195099300,13cyclictest0-21swapper/321:21:213
1195099300,11cyclictest0-21swapper/321:39:293
1195099291,13cyclictest495-21jbd2/dm-0-823:10:123
1195099291,13cyclictest0-21swapper/322:18:283
1195099291,11cyclictest0-21swapper/323:30:573
1195099291,10cyclictest0-21swapper/300:25:013
1195099290,27cyclictest0-21swapper/300:28:493
1195099290,13cyclictest0-21swapper/319:34:493
1195099290,12cyclictest0-21swapper/323:24:483
133102280,3sleep19-21rcu_preempt20:25:021
1195099281,24cyclictest17958-21awk23:00:223
1195099281,13cyclictest0-21swapper/300:07:493
1195099281,12cyclictest547-21diskmemload22:47:403
1195099281,11cyclictest0-21swapper/319:52:213
1195099280,19cyclictest0-21swapper/323:46:573
1193399289,16cyclictest24844-21basename22:05:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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