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2026-06-02 - 10:49

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 Tue Jun 02, 2026 00:43:53)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2245793213563,67sleep30-21swapper/33
224555728353,10sleep20-21swapper/22
224357128353,7sleep00-21swapper/00
224107727557,10sleep10-21swapper/11
26522832340,2sleep30-21swapper/33
224589499231,19cyclictest2246113-21chrt3
2245894992211,8cyclictest0-21swapper/33
224589499221,18cyclictest0-21swapper/33
224589499221,17cyclictest2296474-21taskset3
224589499211,17cyclictest0-21swapper/33
224589499211,16cyclictest2499301-21taskset3
224589499211,16cyclictest0-21swapper/33
2245894992012,5cyclictest0-21swapper/33
224589499201,16cyclictest0-21swapper/33
224589499201,15cyclictest0-21swapper/33
26412512191,4sleep02642521-21tr0
224589499192,12cyclictest2605076-21taskset3
224589499192,12cyclictest2407958-21taskset3
2245894991916,1cyclictest0-21swapper/33
2245894991916,1cyclictest0-21swapper/33
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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