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2026-06-30 - 10:27

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 Jun 30, 2026 00:44:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
121602236162,21sleep10-21swapper/119:05:561
123932232164,23sleep00-21swapper/019:08:570
121562224149,25sleep20-21swapper/219:05:532
122492202165,25sleep30-21swapper/319:07:063
125739910298,3cyclictest0-21swapper/221:39:082
12573998784,2cyclictest0-21swapper/220:33:562
112462560,7sleep230-21rcuc/222:45:132
179722520,1sleep30-21swapper/321:45:223
20092480,4sleep123-21ksoftirqd/123:35:251
187232480,1sleep00-21swapper/020:35:110
119492480,2sleep01256399cyclictest22:45:190
1257399411,31cyclictest0-21swapper/200:26:262
1257399411,30cyclictest0-21swapper/220:06:052
1257399410,29cyclictest0-21swapper/219:10:372
1257399401,28cyclictest0-21swapper/200:11:432
1257399391,29cyclictest0-21swapper/219:27:562
1257399350,22cyclictest0-21swapper/220:10:172
1257399341,30cyclictest0-21swapper/220:45:372
1257399341,27cyclictest0-21swapper/221:54:002
1257399341,22cyclictest0-21swapper/220:24:212
1257399341,22cyclictest0-21swapper/220:24:212
1257399341,21cyclictest0-21swapper/220:18:212
1257399341,21cyclictest0-21swapper/200:37:302
1257399341,20cyclictest0-21swapper/221:57:122
1256399343,15cyclictest1887-21munin-run22:25:010
1257399331,21cyclictest0-21swapper/219:41:522
1257399331,20cyclictest0-21swapper/223:57:032
1257399331,20cyclictest0-21swapper/200:04:552
1257899328,4cyclictest0-21swapper/320:16:283
1257899321,19cyclictest0-21swapper/319:13:213
12573993222,3cyclictest0-21swapper/222:51:272
1257399321,25cyclictest0-21swapper/200:09:472
1257399321,22cyclictest0-21swapper/220:36:332
1257399321,21cyclictest0-21swapper/200:34:462
1257399321,18cyclictest0-21swapper/223:20:592
1257399321,15cyclictest0-21swapper/223:31:232
1257399320,20cyclictest0-21swapper/220:53:212
1256399324,13cyclictest19828-21munin-run19:25:010
1256399322,22cyclictest20770-21kworker/0:222:07:150
1256399321,24cyclictest19740-21kworker/0:219:30:170
1256399321,23cyclictest18546-21kworker/0:021:51:250
1257899310,26cyclictest0-21swapper/320:36:113
1257399311,21cyclictest0-21swapper/221:06:252
1257399311,21cyclictest0-21swapper/221:01:492
1257399311,19cyclictest0-21swapper/219:50:482
1257399311,12cyclictest0-21swapper/219:38:122
1257399310,14cyclictest0-21swapper/223:28:352
1256399311,23cyclictest25615-21kworker/0:119:47:170
1256399311,23cyclictest12647-21kworker/0:222:58:190
1256399310,24cyclictest28245-21kworker/0:219:40:450
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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