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2026-04-14 - 17:50

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, slot #5

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 rack0slot5s.osadl.org (updated Tue Apr 14, 2026 00:45:27)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
25961272355310,17sleep90-21swapper/915
25959072355312,16sleep110-21swapper/113
25961612353310,16sleep50-21swapper/511
25959532347322,16sleep30-21swapper/39
25961642345321,15sleep80-21swapper/814
25960992345319,17sleep10-21swapper/11
25960002343318,16sleep70-21swapper/713
25959872343317,17sleep130-21swapper/135
25960522342316,17sleep60-21swapper/612
25960412341317,15sleep140-21swapper/146
25959452340314,17sleep120-21swapper/124
25961502338312,17sleep150-21swapper/157
25960292338312,17sleep20-21swapper/28
25906262338314,16sleep40-21swapper/410
25961662337310,17sleep100-21swapper/102
25958752337314,15sleep00-21swapper/00
27327062570,0sleep80-21swapper/814
27327062570,0sleep80-21swapper/814
28705592400,0sleep50-21swapper/511
2596553993838,0cyclictest0-21swapper/113
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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