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2025-09-03 - 21:09

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, 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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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 rack3slot3s.osadl.org (updated Wed Sep 03, 2025 12:43:57)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
407161521900,2sleep00-21swapper/010:03:230
404049121710,1sleep2411rcuc/209:41:112
38658272150103,15sleep20-21swapper/207:05:212
38666392145100,15sleep30-21swapper/307:08:043
38659332133109,16sleep00-21swapper/007:05:230
38666672130108,15sleep10-21swapper/107:08:251
403352121210,2sleep20-21swapper/209:36:512
402510521050,1sleep00-21swapper/009:30:310
41189772920,2sleep10-21swapper/110:35:141
329162880,3sleep0221rcuc/011:47:210
41601322390,3sleep23990251-21diskmemload11:05:132
3866924993530,3cyclictest733-21gdbus08:55:003
40546702320,2sleep20-21swapper/209:50:212
3866924993228,2cyclictest30753-21needreboot11:45:173
3866924993223,6cyclictest3990783-21grep09:10:143
3866924992924,3cyclictest81721-21grep12:15:303
3866924992920,6cyclictest4181481-21cron11:20:003
386692499284,2cyclictest0-21swapper/310:17:513
3866924992621,3cyclictest4035695-21tr09:40:123
3866924992521,2cyclictest0-21swapper/312:34:593
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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