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2025-07-07 - 02:13

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 Mon Jul 07, 2025 00:43:56)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
287997122280,2sleep00-21swapper/021:45:050
27013702146100,15sleep30-21swapper/319:09:143
2701162214499,16sleep00-21swapper/019:06:340
2701080214498,15sleep20-21swapper/219:05:322
2701342213395,12sleep10-21swapper/119:08:521
2701554994228,10cyclictest2895738-21grep21:55:153
2701554992723,2cyclictest0-21swapper/322:05:153
2701554992621,3cyclictest0-21swapper/322:29:593
2701554992522,2cyclictest2958880-21gltestperf22:35:153
2701554992521,3cyclictest3048082-21grep23:30:203
2701554992521,3cyclictest3048082-21grep23:30:193
2701554992521,2cyclictest2934265-21ls22:19:593
29632472241,10sleep02824483-21diskmemload22:35:500
270155499241,9cyclictest2880277-21fschecks_time21:45:143
270155499241,7cyclictest2878381-21runrttasks21:42:543
2701554992415,6cyclictest2829407-21grep21:10:303
2701554992412,8cyclictest262-21systemd-journal22:32:083
2701554992320,2cyclictest2709169-21kthreadcore19:15:173
2701554992319,2cyclictest0-21swapper/320:50:133
2701554992319,2cyclictest0-21swapper/319:25:233
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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