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2026-07-05 - 09:45

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 100 highest latencies:
System rack3slot3s.osadl.org (updated Sun Jul 05, 2026 00:43:54)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
101542723260,2sleep01008108-40find0
599412212662,58sleep30-21swapper/33
59954028770,11sleep20-21swapper/22
59950928654,12sleep10-21swapper/11
59936427555,14sleep00-21swapper/00
10498522300,2sleep0221rcuc/00
59969499231,18cyclictest0-21swapper/33
599694992310,9cyclictest884061-21turbostat3
59969499215,3cyclictest800296-21taskset3
59969499215,3cyclictest800296-21taskset3
599694992111,6cyclictest825816-21taskset3
59969499211,16cyclictest0-21swapper/33
59969499211,16cyclictest0-21swapper/33
599694992012,5cyclictest0-21swapper/33
59969499201,16cyclictest0-21swapper/33
59969499201,15cyclictest0-21swapper/33
59969499201,14cyclictest0-21swapper/33
59969499198,8cyclictest964936-21chrt3
59969499191,15cyclictest66950irq/132-enp1s0-TxRx-33
599694991911,5cyclictest0-21swapper/33
59969499191,15cyclictest0-21swapper/33
59969499191,15cyclictest0-21swapper/33
59969499191,14cyclictest0-21swapper/33
59969499191,14cyclictest0-21swapper/33
59969499190,17cyclictest0-21swapper/33
59969499190,16cyclictest66950irq/132-enp1s0-TxRx-33
599694991811,4cyclictest0-21swapper/33
59969499181,14cyclictest0-21swapper/33
59969499181,14cyclictest0-21swapper/33
59969499181,14cyclictest0-21swapper/33
59969499181,14cyclictest0-21swapper/33
59969499181,14cyclictest0-21swapper/33
59969499181,13cyclictest0-21swapper/33
59969499181,13cyclictest0-21swapper/33
59969499181,13cyclictest0-21swapper/33
59969499181,13cyclictest0-21swapper/33
59969499180,15cyclictest66950irq/132-enp1s0-TxRx-33
59969499180,14cyclictest0-21swapper/33
59969499180,14cyclictest0-21swapper/33
59969499180,14cyclictest0-21swapper/33
10050092181,6sleep11005019-21ssh1
9242282171,4sleep0727371-21diskmemload0
8919412171,4sleep2891955-21ssh2
8358072171,4sleep0836446-21kthreadcore0
8331642171,3sleep10-21swapper/11
7836982171,4sleep0783710-21ssh0
7491022175,2sleep0727371-21diskmemload0
59969499176,8cyclictest722139-21turbostat3
59969499171,13cyclictest0-21swapper/33
59969499170,15cyclictest0-21swapper/33
59969499170,14cyclictest8739432sleep33
59969499170,14cyclictest0-21swapper/33
59969499170,14cyclictest0-21swapper/33
59969499170,14cyclictest0-21swapper/33
59969499170,13cyclictest0-21swapper/33
59969499170,13cyclictest0-21swapper/33
59969499170,13cyclictest0-21swapper/33
9882492161,4sleep1727371-21diskmemload1
9635582160,3sleep20-21swapper/22
9571992160,1sleep10-21swapper/11
8346012161,2sleep00-21swapper/00
7526162162,9sleep2752621-21apt-get2
6742902161,3sleep00-21swapper/00
59969499166,8cyclictest648799-21turbostat3
59969499166,8cyclictest648799-21turbostat3
599694991612,3cyclictest0-21swapper/33
599694991612,2cyclictest0-21swapper/33
599694991612,2cyclictest0-21swapper/33
59969499161,13cyclictest0-21swapper/33
59969499161,13cyclictest0-21swapper/33
59969499161,12cyclictest0-21swapper/33
59969499160,14cyclictest0-21swapper/33
59969499160,13cyclictest0-21swapper/33
59969499160,13cyclictest0-21swapper/33
59969499160,12cyclictest0-21swapper/33
10167782161,11sleep2727371-21diskmemload2
8567632151,9sleep0856773-21ssh0
8395222157,4sleep20-21swapper/22
8167882151,2sleep10-21swapper/11
8167882151,2sleep10-21swapper/11
8080322151,2sleep00-21swapper/00
8080322151,2sleep00-21swapper/00
6695742151,6sleep20-21swapper/22
6277542150,1sleep00-21swapper/00
59969499151,3cyclictest0-21swapper/33
59969499151,12cyclictest0-21swapper/33
59969499150,2cyclictest0-21swapper/33
59969499150,12cyclictest0-21swapper/33
9390822141,8sleep0727371-21diskmemload0
8508262140,10sleep2727371-21diskmemload2
8236602140,2sleep10-21swapper/11
7991602141,9sleep1799171-21ssh1
7991602141,9sleep1799171-21ssh1
7355282141,2sleep10-21swapper/11
59969499148,4cyclictest721934-21chrt3
59969499148,3cyclictest680269-21chrt3
59969499148,3cyclictest6224972sleep33
59969499147,4cyclictest617337-21chrt3
59969499140,2cyclictest0-21swapper/33
59969499140,12cyclictest0-21swapper/33
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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