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2025-12-16 - 12:17

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 20 highest latencies:
System rack5slot3s.osadl.org (updated Tue Dec 16, 2025 00:44:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
72952236162,24sleep30-21swapper/319:09:313
71122236162,24sleep10-21swapper/119:07:071
71202217164,41sleep20-21swapper/219:07:132
71952202169,22sleep00-21swapper/019:08:110
7421999490,3cyclictest0-21swapper/121:35:231
7421996557,2cyclictest0-21swapper/122:02:471
7421996258,3cyclictest0-21swapper/119:55:361
217932600,1sleep20-21swapper/200:35:122
72942590,2sleep20-21swapper/200:00:212
217242520,2sleep20-21swapper/222:05:232
217242520,2sleep20-21swapper/222:05:232
155032470,1sleep10-21swapper/100:20:141
202872450,5sleep3743399cyclictest19:35:193
209902440,4sleep011-21rcuc/023:20:000
209902440,4sleep011-21rcuc/023:20:000
742199400,16cyclictest0-21swapper/123:55:181
742199361,3cyclictest13100-21grep20:35:011
742199361,11cyclictest21126-21head00:30:231
742199361,11cyclictest21126-21head00:30:231
7421993513,3cyclictest1088-21df21:20:151
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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