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2024-04-14 - 18:34

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 Sat Apr 13, 2024 12:44:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2025323190,7sleep30-21swapper/307:05:213
218602235162,59sleep00-21swapper/007:08:500
216742204167,24sleep20-21swapper/207:06:272
217352202165,24sleep10-21swapper/107:07:141
496521700,3sleep32206199cyclictest08:55:263
1681121470,3sleep32206199cyclictest10:35:263
22056999388,4cyclictest0-21swapper/207:19:522
22056997061,8cyclictest0-21swapper/208:38:182
95242620,4sleep30-21swapper/310:20:213
301962570,1sleep10-21swapper/107:25:241
279912550,2sleep20-21swapper/209:45:512
22061994724,8cyclictest0-21swapper/310:27:243
22061994319,10cyclictest0-21swapper/309:48:583
2205699377,10cyclictest836-21runrttasks09:10:332
22056993613,11cyclictest30653-40dnf12:20:282
22045993610,12cyclictest10124-21munin-run07:55:010
2205699359,12cyclictest16015-21users11:45:412
2206199341,9cyclictest32688-21df08:45:223
2206199341,14cyclictest0-21swapper/307:40:263
22061993410,12cyclictest0-21swapper/309:39:523
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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