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2025-05-05 - 00:15

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, 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.
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 rackcslot7s.osadl.org (updated Sun May 04, 2025 12:44:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1623991140,20rtkit-daemon0-21swapper/109:31:080
462237210782,16sleep30-21swapper/307:06:423
49762821000,4sleep10-21swapper/108:45:291
5751992940,6sleep10-21swapper/112:25:231
162399930,46rtkit-daemon0-21swapper/107:09:141
162399810,68rtkit-daemon0-21swapper/007:07:340
5773702780,5sleep32197014-21PK-Backend12:30:323
5553502760,4sleep30-21swapper/311:30:033
162399730,5rtkit-daemon2197014-21PK-Backend10:00:070
162399710,6rtkit-daemon2197014-21PK-Backend07:48:280
462616997016,48cyclictest556306-40lsb_release11:30:270
46228627040,24sleep20-21swapper/207:07:212
162399700,7rtkit-daemon2197014-21PK-Backend10:12:000
162399690,6rtkit-daemon2197014-21PK-Backend10:25:060
162399680,11rtkit-daemon1622-21rtkit-daemon12:08:391
162399660,51rtkit-daemon3242254-21gmain11:55:491
462622996012,28cyclictest1753-21gnome-shell08:45:212
162399600,43rtkit-daemon0-21swapper/112:02:131
46262299590,55cyclictest1622-21rtkit-daemon08:19:122
162399590,9rtkit-daemon1622-21rtkit-daemon12:09:300
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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