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2026-05-12 - 09:20

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 Tue May 12, 2026 00:43:53)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
277795621270,3sleep12777962-21needreboot1
2712657212061,55sleep30-21swapper/33
2711763211192,10sleep10-21swapper/11
271278428163,12sleep20-21swapper/22
271259526956,7sleep00-21swapper/00
29450662231,7sleep02843317-21diskmemload0
271303499221,8cyclictest3187948-21taskset3
2713034992117,2cyclictest0-21swapper/33
271303499211,3cyclictest0-21swapper/33
271303499211,16cyclictest0-21swapper/33
271303499211,16cyclictest0-21swapper/33
271303499211,15cyclictest2902927-21chrt3
271303499210,18cyclictest0-21swapper/33
2713034992017,1cyclictest0-21swapper/33
271303499201,16cyclictest2933593-21taskset3
271303499199,8cyclictest2943164-21chrt3
271303499199,7cyclictest3071379-21taskset3
271303499192,14cyclictest66950irq/132-enp1s0-TxRx-33
2713034991916,1cyclictest0-21swapper/33
2713034991916,1cyclictest0-21swapper/33
271303499191,15cyclictest0-21swapper/33
271303499191,14cyclictest0-21swapper/33
271303499191,14cyclictest0-21swapper/33
271303499191,14cyclictest0-21swapper/33
271303499191,14cyclictest0-21swapper/33
271303499191,14cyclictest0-21swapper/33
271303499191,14cyclictest0-21swapper/33
31893032182,4sleep00-21swapper/00
28666752181,3sleep02866689-21ssh0
28590542181,4sleep12859068-21ssh1
271303499181,14cyclictest66950irq/132-enp1s0-TxRx-33
271303499181,14cyclictest0-21swapper/33
271303499181,14cyclictest0-21swapper/33
271303499181,14cyclictest0-21swapper/33
271303499181,14cyclictest0-21swapper/33
271303499181,14cyclictest0-21swapper/33
271303499181,14cyclictest0-21swapper/33
271303499181,14cyclictest0-21swapper/33
271303499181,14cyclictest0-21swapper/33
271303499181,14cyclictest0-21swapper/33
271303499181,14cyclictest0-21swapper/33
271303499181,14cyclictest0-21swapper/33
271303499181,13cyclictest0-21swapper/33
271303499181,13cyclictest0-21swapper/33
271303499180,2cyclictest0-21swapper/33
271303499180,15cyclictest0-21swapper/33
271303499180,15cyclictest0-21swapper/33
271303499180,14cyclictest0-21swapper/33
271303499180,14cyclictest0-21swapper/33
31390892171,3sleep20-21swapper/22
29529702171,4sleep22843317-21diskmemload2
29529702171,4sleep22843317-21diskmemload2
28515712171,3sleep00-21swapper/00
28515712171,3sleep00-21swapper/00
271303499171,4cyclictest0-21swapper/33
271303499171,4cyclictest0-21swapper/33
271303499171,4cyclictest0-21swapper/33
2713034991712,3cyclictest0-21swapper/33
271303499171,13cyclictest0-21swapper/33
271303499171,13cyclictest0-21swapper/33
271303499171,12cyclictest0-21swapper/33
271303499170,14cyclictest0-21swapper/33
271303499170,14cyclictest0-21swapper/33
271303499170,13cyclictest0-21swapper/33
31960832161,10sleep02843317-21diskmemload0
31417292161,12sleep13142024-21kthreadcore1
31291732161,2sleep20-21swapper/22
31291732161,2sleep20-21swapper/22
30960202161,3sleep00-21swapper/00
30103362161,2sleep10-21swapper/11
29851792160,1sleep10-21swapper/11
29335562161,4sleep02843317-21diskmemload0
2713034991613,1cyclictest0-21swapper/33
271303499161,13cyclictest0-21swapper/33
271303499161,11cyclictest0-21swapper/33
271303499160,13cyclictest0-21swapper/33
271303499160,13cyclictest0-21swapper/33
271303499160,13cyclictest0-21swapper/33
271303499160,13cyclictest0-21swapper/33
271303499160,13cyclictest0-21swapper/33
271303499160,13cyclictest0-21swapper/33
30391052151,10sleep03039150-21kthreadcore0
30391052151,10sleep03039150-21kthreadcore0
30365822151,3sleep02843317-21diskmemload0
29939862151,9sleep02843317-21diskmemload0
29596192151,3sleep02843317-21diskmemload0
29071772151,5sleep02907235-21ntpq0
28986742151,4sleep22898728-21ntpq2
28168932151,10sleep02816963-21fschecks_count0
2713034991513,1cyclictest0-21swapper/33
271303499151,2cyclictest0-21swapper/33
271303499150,12cyclictest0-21swapper/33
271303499150,12cyclictest0-21swapper/33
271303499150,12cyclictest0-21swapper/33
30510672142,6sleep13051125-21ntpq1
30435582141,2sleep10-21swapper/11
30435582141,2sleep10-21swapper/11
30216292140,3sleep20-21swapper/22
29842342141,4sleep22984244-21ssh2
28501342141,9sleep12850144-21ssh1
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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