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2026-05-17 - 15:39

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 May 17, 2026 12:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1013096212055,60sleep30-21swapper/33
12220322930,3sleep2431ktimers/22
101316628163,12sleep20-21swapper/22
101300227862,11sleep10-21swapper/11
101308527662,8sleep00-21swapper/00
1013386992624,1cyclictest0-21swapper/33
1013386992523,1cyclictest0-21swapper/33
1013386992522,1cyclictest0-21swapper/33
101338699251,20cyclictest0-21swapper/33
1013386992422,1cyclictest0-21swapper/33
1013386992421,2cyclictest0-21swapper/33
1013386992321,1cyclictest0-21swapper/33
1013386992320,2cyclictest0-21swapper/33
1013386992319,2cyclictest0-21swapper/33
1013386992318,2cyclictest0-21swapper/33
1013386992310,1cyclictest0-21swapper/33
101338699227,12cyclictest0-21swapper/33
1013386992220,1cyclictest0-21swapper/33
1013386992219,1cyclictest0-21swapper/33
1013386992219,1cyclictest0-21swapper/33
1013386992211,8cyclictest66950irq/132-enp1s0-TxRx-33
14158622210,12sleep20-21swapper/22
101338699217,9cyclictest0-21swapper/33
1013386992119,1cyclictest0-21swapper/33
1013386992119,1cyclictest0-21swapper/33
1013386992117,2cyclictest0-21swapper/33
1013386992117,2cyclictest0-21swapper/33
1013386992117,2cyclictest0-21swapper/33
1013386992117,2cyclictest0-21swapper/33
1013386992117,2cyclictest0-21swapper/33
1013386992113,5cyclictest66950irq/132-enp1s0-TxRx-33
1013386992112,6cyclictest1239681-21chrt3
101338699211,16cyclictest1122406-21taskset3
101338699205,12cyclictest0-21swapper/33
101338699202,15cyclictest66950irq/132-enp1s0-TxRx-33
1013386992017,2cyclictest0-21swapper/33
1013386992017,2cyclictest0-21swapper/33
1013386992017,1cyclictest0-21swapper/33
1013386992017,1cyclictest0-21swapper/33
1013386992016,2cyclictest0-21swapper/33
101338699201,15cyclictest1373372-21taskset3
101338699200,8cyclictest0-21swapper/33
11755642191,7sleep21143828-21diskmemload2
11598692192,4sleep21143828-21diskmemload2
101338699194,12cyclictest0-21swapper/33
101338699193,13cyclictest0-21swapper/33
1013386991917,1cyclictest0-21swapper/33
1013386991917,1cyclictest0-21swapper/33
1013386991916,1cyclictest0-21swapper/33
1013386991914,4cyclictest66950irq/132-enp1s0-TxRx-33
101338699191,15cyclictest0-21swapper/33
101338699191,14cyclictest0-21swapper/33
101338699191,14cyclictest0-21swapper/33
101338699191,14cyclictest0-21swapper/33
101338699191,14cyclictest0-21swapper/33
1013386991910,6cyclictest1035637-21taskset3
14825892181,11sleep00-21swapper/00
14406422181,8sleep01440654-21ssh0
101338699183,13cyclictest0-21swapper/33
1013386991816,1cyclictest0-21swapper/33
1013386991816,1cyclictest0-21swapper/33
1013386991816,1cyclictest0-21swapper/33
1013386991816,1cyclictest0-21swapper/33
1013386991815,1cyclictest0-21swapper/33
1013386991814,2cyclictest0-21swapper/33
13368162171,4sleep01336873-21ntpq0
12598652171,5sleep11143828-21diskmemload1
101338699171,4cyclictest0-21swapper/33
1013386991713,2cyclictest0-21swapper/33
1013386991713,2cyclictest0-21swapper/33
1013386991713,2cyclictest0-21swapper/33
1013386991713,2cyclictest0-21swapper/33
1013386991713,2cyclictest0-21swapper/33
1013386991713,2cyclictest0-21swapper/33
1013386991712,3cyclictest0-21swapper/33
14097062161,4sleep11143828-21diskmemload1
14003442161,2sleep10-21swapper/11
13662362161,4sleep01143828-21diskmemload0
13566712160,1sleep10-21swapper/11
13491762161,9sleep10-21swapper/11
12549552162,9sleep21143828-21diskmemload2
12536972161,2sleep20-21swapper/22
12284632161,3sleep00-21swapper/00
1013386991614,1cyclictest0-21swapper/33
1013386991614,1cyclictest0-21swapper/33
1013386991613,1cyclictest0-21swapper/33
101338699160,14cyclictest0-21swapper/33
101338699160,13cyclictest0-21swapper/33
149426921510,2sleep21458496-21kworker/2:1+events_freezable2
14828382151,4sleep11143828-21diskmemload1
14333432151,2sleep00-21swapper/00
13745632151,2sleep20-21swapper/22
13286592151,4sleep11143828-21diskmemload1
12089872151,3sleep11143828-21diskmemload1
10627692150,1sleep10-21swapper/11
10627692150,1sleep10-21swapper/11
101338699150,12cyclictest0-21swapper/33
14828082141,3sleep21482822-21sh2
14594082146,3sleep01143828-21diskmemload0
14232912141,8sleep01143828-21diskmemload0
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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