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2026-06-20 - 03:47

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 50 highest latencies:
System rack3slot3s.osadl.org (updated Sat Jun 20, 2026 00:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
299104123720,1sleep172-21kcompactd01
2796920212952,69sleep30-21swapper/33
279700928451,11sleep20-21swapper/22
279719728156,17sleep00-21swapper/00
279718328163,12sleep10-21swapper/11
32532282480,2sleep30-21swapper/33
2797407992111,7cyclictest0-21swapper/33
279740799201,7cyclictest2948813-21taskset3
2797407992017,1cyclictest0-21swapper/33
279740799201,16cyclictest0-21swapper/33
279740799201,14cyclictest3212368-21chrt3
279740799201,13cyclictest3262910-21chrt3
279740799200,17cyclictest0-21swapper/33
279740799192,13cyclictest3010011-21chrt3
2797407991915,2cyclictest0-21swapper/33
279740799191,15cyclictest0-21swapper/33
279740799191,15cyclictest0-21swapper/33
279740799191,14cyclictest0-21swapper/33
279740799191,14cyclictest0-21swapper/33
279740799191,14cyclictest0-21swapper/33
279740799191,14cyclictest0-21swapper/33
279740799191,14cyclictest0-21swapper/33
279740799191,14cyclictest0-21swapper/33
279740799191,13cyclictest0-21swapper/33
32439512181,4sleep13243962-21ssh1
32006342181,5sleep00-21swapper/00
31991062181,2sleep20-21swapper/22
29652612181,2sleep10-21swapper/11
29258442182,5sleep22925840-21apt-get2
279740799189,6cyclictest3134767-21turbostat3
279740799187,8cyclictest2888634-21turbostat3
2797407991814,2cyclictest0-21swapper/33
2797407991812,3cyclictest0-21swapper/33
279740799181,14cyclictest0-21swapper/33
279740799181,14cyclictest0-21swapper/33
279740799181,14cyclictest0-21swapper/33
279740799181,14cyclictest0-21swapper/33
279740799181,14cyclictest0-21swapper/33
279740799181,14cyclictest0-21swapper/33
279740799181,14cyclictest0-21swapper/33
279740799181,13cyclictest0-21swapper/33
279740799181,13cyclictest0-21swapper/33
279740799181,13cyclictest0-21swapper/33
279740799180,14cyclictest2841410-21turbostat3
279740799180,14cyclictest0-21swapper/33
31165882171,11sleep12925445-21diskmemload1
30647862171,3sleep10-21swapper/11
30077212171,2sleep10-21swapper/11
279740799174,10cyclictest0-21swapper/33
2797407991711,3cyclictest0-21swapper/33
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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