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2026-05-18 - 13:51

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 May 18, 2026 12:44:46)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
283491850,76ptp4l0-21swapper/107:06:451
352626951,10sleep110-21swapper/1107:06:233
346826856,10sleep70-21swapper/707:05:319
124626755,9sleep40-21swapper/407:05:166
360226654,10sleep60-21swapper/607:07:308
352026655,9sleep50-21swapper/507:06:177
259926655,8sleep100-21swapper/1007:05:212
352826554,9sleep00-21swapper/007:06:230
419699211,15cyclictest0-21swapper/408:45:006
419699210,7cyclictest0-21swapper/409:15:016
423999203,11cyclictest0-21swapper/911:35:0011
420799191,17cyclictest0-21swapper/607:25:178
418399193,11cyclictest0-21swapper/110:55:011
421299184,9cyclictest0-21swapper/709:50:009
420799184,8cyclictest0-21swapper/611:05:018
4207991814,3cyclictest0-21swapper/609:10:188
420199183,8cyclictest0-21swapper/512:25:017
419699181,16cyclictest0-21swapper/410:10:176
419699180,4cyclictest0-21swapper/407:55:166
419299183,9cyclictest0-21swapper/312:40:015
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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