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2026-07-04 - 13:21

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, slot #7

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 rack7slot7s.osadl.org (updated Sat Jul 04, 2026 00:43:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3391210153,43sleep20-21swapper/219:05:522
3391210153,43sleep20-21swapper/219:05:512
361329178,9sleep00-21swapper/019:08:430
361329178,9sleep00-21swapper/019:08:420
338728471,9sleep30-21swapper/319:05:493
338728471,9sleep30-21swapper/319:05:483
341528363,6sleep10-21swapper/119:06:111
341528363,6sleep10-21swapper/119:06:101
277662660,0sleep30-21swapper/323:41:173
380299280,27cyclictest0-21swapper/223:55:462
380299260,23cyclictest0-21swapper/222:15:422
3802992525,0cyclictest0-21swapper/219:54:162
380299250,25cyclictest0-21swapper/221:54:592
380099250,1cyclictest0-21swapper/122:33:361
3800992421,2cyclictest25-21ksoftirqd/119:55:001
380099241,16cyclictest0-21swapper/121:30:251
380299230,20cyclictest0-21swapper/221:28:532
3796992312,6cyclictest2866-21sh00:05:160
380599220,18cyclictest0-21swapper/323:59:543
3802992220,1cyclictest0-21swapper/222:26:482
380299220,22cyclictest0-21swapper/223:30:342
3800992220,1cyclictest25-21ksoftirqd/122:20:441
380099221,12cyclictest141rcu_preempt21:26:181
3802992121,0cyclictest0-21swapper/222:31:592
380099210,21cyclictest0-21swapper/100:34:441
380099210,18cyclictest0-21swapper/122:15:141
380099210,13cyclictest0-21swapper/100:28:281
379699210,21cyclictest0-21swapper/021:40:130
380599200,18cyclictest0-21swapper/319:55:133
380299201,3cyclictest141rcu_preempt22:04:322
380299200,20cyclictest0-21swapper/223:10:402
380299200,19cyclictest0-21swapper/221:20:442
3796992019,1cyclictest0-21swapper/023:10:370
3805991916,2cyclictest39-21ksoftirqd/322:05:443
380599190,19cyclictest0-21swapper/323:51:483
380299191,18cyclictest0-21swapper/222:55:532
380299190,19cyclictest0-21swapper/222:46:472
380299190,18cyclictest0-21swapper/221:36:152
380099198,5cyclictest26410-21cpuspeed_turbos00:00:131
3800991916,2cyclictest38150irq/131-snd_hda19:45:131
3800991913,3cyclictest25-21ksoftirqd/123:37:351
380099191,1cyclictest29171-21diskmemload21:40:561
380099190,2cyclictest0-21swapper/122:26:061
221842190,0sleep049-21kcompactd020:55:020
221842190,0sleep049-21kcompactd020:55:010
380599186,8cyclictest4587-21apt-get22:50:133
380299187,7cyclictest30284-21tr23:05:142
380299180,2cyclictest0-21swapper/223:25:202
380299180,18cyclictest0-21swapper/221:14:222
380299180,17cyclictest0-21swapper/222:44:412
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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