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2025-02-11 - 00:29

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, slot #8

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 rack0slot8s.osadl.org (updated Mon Feb 10, 2025 12:44:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
94980960,90rtkit-daemon0-21swapper/1107:06:183
275991950,85ptp4l0-21swapper/107:06:291
94980720,67rtkit-daemon0-21swapper/507:09:387
185226750,8sleep40-21swapper/407:07:476
86092650,2sleep227-21ksoftirqd/211:09:594
199226553,10sleep70-21swapper/707:09:519
179426554,9sleep00-21swapper/007:06:560
103126451,10sleep60-21swapper/607:05:258
176526150,9sleep100-21swapper/1007:06:302
240762570,0sleep50-21swapper/509:00:137
2760913734,1phc2sys0-21swapper/207:08:294
240499232,16cyclictest0-21swapper/409:35:006
240499222,16cyclictest0-21swapper/409:00:006
240499212,15cyclictest0-21swapper/408:40:006
240499212,15cyclictest0-21swapper/408:15:006
275991190,1ptp4l21-21ksoftirqd/110:15:021
243499181,15cyclictest0-21swapper/1008:35:162
239199184,9cyclictest0-21swapper/211:35:004
239199180,3cyclictest0-21swapper/208:20:174
243999174,7cyclictest0-21swapper/1109:10:283
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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