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2026-08-04 - 14:06

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 Aug 04, 2026 00:44:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
74912236163,23sleep20-21swapper/219:08:572
74072236163,22sleep10-21swapper/119:07:501
72402236162,25sleep00-21swapper/019:05:400
73322203167,24sleep30-21swapper/319:06:523
89192570,4sleep011-21rcuc/022:50:190
167702520,3sleep341-21ksoftirqd/321:55:153
101982490,1sleep30-21swapper/319:15:023
185252450,4sleep121-21rcuc/119:30:221
51972440,1sleep20-21swapper/222:40:252
301882400,1sleep30-21swapper/322:25:183
766899381,30cyclictest0-21swapper/119:37:391
766399377,13cyclictest17121-21munin-run19:30:000
767999342,20cyclictest0-21swapper/321:28:243
766399348,12cyclictest4555-21idleruntime-cro20:15:010
766899310,24cyclictest0-21swapper/122:44:431
766399311,9cyclictest15764-21/usr/sbin/munin20:40:240
766899301,22cyclictest0-21swapper/123:47:441
766899301,11cyclictest0-21swapper/120:38:191
766899300,19cyclictest0-21swapper/121:01:281
766899300,11cyclictest0-21swapper/123:50:181
766899291,12cyclictest0-21swapper/122:38:591
766899290,8cyclictest0-21swapper/120:22:511
766899290,22cyclictest0-21swapper/121:48:281
767999281,14cyclictest0-21swapper/321:35:453
767399281,11cyclictest20164-21/usr/sbin/munin20:50:172
766899281,9cyclictest0-21swapper/121:30:161
766899281,7cyclictest0-21swapper/100:16:321
766899281,12cyclictest0-21swapper/100:24:061
766899281,11cyclictest0-21swapper/120:32:251
766899281,10cyclictest0-21swapper/120:26:391
766899281,10cyclictest0-21swapper/119:27:421
766399282,14cyclictest5164-21munin-run21:30:010
61682280,9sleep341-21ksoftirqd/322:45:153
766899273,13cyclictest19614-40dnf00:30:031
766899271,11cyclictest0-21swapper/122:10:471
766899270,11cyclictest0-21swapper/123:24:481
766899270,11cyclictest0-21swapper/121:56:321
766899270,11cyclictest0-21swapper/121:05:161
766899270,11cyclictest0-21swapper/120:19:071
766399270,14cyclictest18966-21idleruntime-cro23:15:020
766399270,13cyclictest26547-21idleruntime-cro21:05:020
75972270,3sleep1766899cyclictest22:45:301
766899261,9cyclictest0-21swapper/120:52:231
766899261,9cyclictest0-21swapper/119:10:151
766899261,9cyclictest0-21swapper/100:09:481
766899261,5cyclictest4088-21sed21:25:201
766899261,11cyclictest0-21swapper/120:08:051
766899261,10cyclictest0-21swapper/121:51:081
766899260,21cyclictest0-21swapper/120:13:391
766899260,17cyclictest0-21swapper/100:37:391
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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