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2026-04-18 - 08:54

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 Sat Apr 18, 2026 00:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
93324321330,4sleep2421rcuc/22
556410212267,51sleep30-21swapper/33
97648021160,2sleep190-21kswapd01
55622628466,12sleep10-21swapper/11
55630128251,12sleep20-21swapper/22
55631427656,14sleep00-21swapper/00
9993792230,2sleep20-21swapper/22
9388102231,10sleep0687052-21diskmemload0
55659399231,14cyclictest0-21swapper/33
55659399221,17cyclictest913535-21taskset3
55659399221,17cyclictest853539-21taskset3
7109432210,6sleep0687052-21diskmemload0
556593992117,2cyclictest0-21swapper/33
55659399211,16cyclictest981740-21taskset3
55659399211,16cyclictest938797-21taskset3
55659399211,16cyclictest0-21swapper/33
55659399211,15cyclictest0-21swapper/33
55659399210,17cyclictest1035688-21taskset3
7356652201,7sleep1735719-21ntpq1
55659399206,12cyclictest0-21swapper/33
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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