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2026-11-06 - 23:22

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #1, slot #6

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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  Intel
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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
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rack1slot6s.osadl.org (updated Fri Nov 06, 2026 12:43:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2498999924,23cyclictest0-21swapper/006:38:350
2498999914,36cyclictest0-21swapper/007:24:220
2498999904,29cyclictest0-21swapper/009:14:250
2498999904,29cyclictest0-21swapper/009:14:250
24989999022,8cyclictest6560-21ssh08:46:060
2498999884,36cyclictest0-21swapper/008:58:010
2498999873,10cyclictest14180-21ssh09:47:270
2498999863,39cyclictest0-21swapper/004:58:310
24989998627,13cyclictest0-21swapper/007:15:480
143362860,5sleep214338-21grep07:18:352
2498999854,34cyclictest0-21swapper/008:30:070
2498999854,34cyclictest0-21swapper/008:30:070
2498999848,13cyclictest0-21swapper/006:46:330
2498999844,36cyclictest0-21swapper/009:08:260
2498999839,30cyclictest0-21swapper/008:02:410
2498999834,39cyclictest0-21swapper/006:59:330
2498999834,25cyclictest0-21swapper/007:56:260
2498999834,25cyclictest0-21swapper/007:56:260
2498999834,22cyclictest0-21swapper/009:03:370
2498999833,27cyclictest0-21swapper/008:09:250
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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