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2026-08-29 - 00:32

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 Fri Aug 28, 2026 12:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3155377212265,53sleep30-21swapper/33
315550528554,10sleep10-21swapper/11
315535628254,14sleep20-21swapper/22
315552827656,14sleep00-21swapper/00
35816782231,17sleep13283967-21diskmemload1
3155921992318,2cyclictest0-21swapper/33
315592199231,19cyclictest66950irq/132-enp1s0-TxRx-33
3155921992218,2cyclictest0-21swapper/33
35217332211,10sleep03521747-21ssh0
315592199211,16cyclictest0-21swapper/33
315592199211,15cyclictest0-21swapper/33
34025672201,7sleep03402581-21ssh0
3155921992011,6cyclictest0-21swapper/33
315592199201,16cyclictest0-21swapper/33
315592199201,15cyclictest66950irq/132-enp1s0-TxRx-33
315592199201,15cyclictest3608594-21turbostat3
315592199200,17cyclictest66950irq/132-enp1s0-TxRx-33
35068062192,6sleep03506521-21sendmail-msp0
35056562190,2sleep10-21swapper/11
33666682191,14sleep13283967-21diskmemload1
31849012191,4sleep03185943-21grep0
315592199199,7cyclictest3290539-21chrt3
315592199192,12cyclictest3396265-21chrt3
3155921991916,1cyclictest0-21swapper/33
3155921991915,3cyclictest66950irq/132-enp1s0-TxRx-33
315592199191,15cyclictest0-21swapper/33
315592199191,15cyclictest0-21swapper/33
315592199191,14cyclictest0-21swapper/33
315592199191,14cyclictest0-21swapper/33
315592199191,14cyclictest0-21swapper/33
315592199191,14cyclictest0-21swapper/33
315592199191,14cyclictest0-21swapper/33
315592199191,14cyclictest0-21swapper/33
315592199190,15cyclictest66950irq/132-enp1s0-TxRx-33
35822192181,5sleep23283967-21diskmemload2
32776932181,8sleep23277791-21grep2
32356872181,3sleep23231389-21sendmail-msp2
32001242180,3sleep00-21swapper/00
315592199189,6cyclictest3279438-21taskset3
315592199189,6cyclictest3220868-21turbostat3
3155921991815,1cyclictest0-21swapper/33
315592199181,4cyclictest0-21swapper/33
315592199181,14cyclictest0-21swapper/33
315592199181,14cyclictest0-21swapper/33
315592199181,14cyclictest0-21swapper/33
315592199181,14cyclictest0-21swapper/33
315592199181,14cyclictest0-21swapper/33
315592199181,14cyclictest0-21swapper/33
315592199181,14cyclictest0-21swapper/33
315592199181,14cyclictest0-21swapper/33
315592199181,13cyclictest0-21swapper/33
315592199181,13cyclictest0-21swapper/33
315592199180,15cyclictest0-21swapper/33
315592199180,15cyclictest0-21swapper/33
315592199180,15cyclictest0-21swapper/33
34628382171,3sleep10-21swapper/11
34196842171,2sleep10-21swapper/11
3155921991714,1cyclictest0-21swapper/33
315592199171,14cyclictest0-21swapper/33
315592199171,13cyclictest0-21swapper/33
315592199171,13cyclictest0-21swapper/33
315592199171,13cyclictest0-21swapper/33
315592199171,13cyclictest0-21swapper/33
3155921991710,5cyclictest0-21swapper/33
315592199170,14cyclictest66950irq/132-enp1s0-TxRx-33
315592199170,14cyclictest0-21swapper/33
315592199170,13cyclictest0-21swapper/33
36401912161,11sleep23640193-21ssh2
35729562161,4sleep23283967-21diskmemload2
35232182161,4sleep23283967-21diskmemload2
34124542160,4sleep00-21swapper/00
33862622160,2sleep10-21swapper/11
33408392161,4sleep23283967-21diskmemload2
33158792160,1sleep20-21swapper/22
33032572162,5sleep20-21swapper/22
33015472161,3sleep00-21swapper/00
32806132161,3sleep13282279-21kthreadcore1
3155921991613,1cyclictest0-21swapper/33
3155921991611,3cyclictest0-21swapper/33
3155921991611,3cyclictest0-21swapper/33
315592199161,13cyclictest0-21swapper/33
315592199161,11cyclictest0-21swapper/33
315592199161,11cyclictest0-21swapper/33
315592199160,13cyclictest0-21swapper/33
315592199160,13cyclictest0-21swapper/33
36044592151,10sleep03604610-21ntp_192.168.1140
35993952151,10sleep03599405-21ssh0
34554802151,9sleep13455735-21sed1
34387572150,1sleep20-21swapper/22
33538232151,5sleep23354760-21kthreadcore2
33538232151,5sleep23354760-21kthreadcore2
3155921991512,2cyclictest0-21swapper/33
315592199151,11cyclictest0-21swapper/33
315592199150,13cyclictest0-21swapper/33
315592199150,13cyclictest0-21swapper/33
315592199150,13cyclictest0-21swapper/33
315592199150,12cyclictest0-21swapper/33
315592199150,12cyclictest0-21swapper/33
315592199150,12cyclictest0-21swapper/33
36312962141,8sleep23283967-21diskmemload2
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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