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2025-05-09 - 07:19

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #f, 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.

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 10 highest latencies:
System rackfslot7s.osadl.org (updated Fri May 09, 2025 00:44:18)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
98742899417720,4150cyclictest1003892-21kworker/2:1+events20:30:002
98742199278013,2761cyclictest1054024-21kworker/0:1+events22:35:140
98742899277511,2759cyclictest1028680-21kworker/2:2+events21:45:132
98742199275613,2740cyclictest1087732-21kworker/0:2+events00:20:010
98743199275313,2735cyclictest995923-21kworker/3:0+events20:00:123
98742699271912,2703cyclictest1060410-21kworker/1:0+events22:55:191
98742699269712,2681cyclictest1016094-21kworker/1:2+events20:35:181
98742899269611,2681cyclictest987557-21kworker/2:2+events19:20:152
98742199269210,2679cyclictest1047367-21kworker/0:0+events22:25:220
98742199268211,2667cyclictest1019242-21kworker/0:2+events20:55:200
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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