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2026-05-22 - 08:22

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 May 22, 2026 00:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
137946021250,2sleep10-21swapper/11
1221296212059,56sleep30-21swapper/33
122567129058,12sleep20-21swapper/22
122584828564,11sleep10-21swapper/11
122585828057,17sleep00-21swapper/00
16469222740,2sleep10-21swapper/11
122599499251,20cyclictest0-21swapper/33
14575702232,7sleep11457627-21ntpq1
1225994992211,7cyclictest1655743-21turbostat3
122599499221,15cyclictest12698842sleep33
122599499220,20cyclictest0-21swapper/33
1225994992117,2cyclictest0-21swapper/33
122599499201,15cyclictest66950irq/132-enp1s0-TxRx-33
122599499201,15cyclictest0-21swapper/33
122599499200,17cyclictest0-21swapper/33
15397912190,2sleep00-21swapper/00
1225994991916,1cyclictest0-21swapper/33
122599499191,15cyclictest0-21swapper/33
122599499191,14cyclictest66950irq/132-enp1s0-TxRx-33
122599499191,14cyclictest0-21swapper/33
122599499191,14cyclictest0-21swapper/33
122599499191,14cyclictest0-21swapper/33
122599499191,14cyclictest0-21swapper/33
122599499191,14cyclictest0-21swapper/33
122599499191,14cyclictest0-21swapper/33
122599499191,14cyclictest0-21swapper/33
122599499191,14cyclictest0-21swapper/33
122599499190,16cyclictest0-21swapper/33
15856412181,2sleep10-21swapper/11
15296252181,3sleep00-21swapper/00
122599499187,1cyclictest0-21swapper/33
122599499181,7cyclictest1661433-21taskset3
1225994991814,2cyclictest0-21swapper/33
122599499181,14cyclictest1383001-21chrt3
1225994991811,4cyclictest13720952sleep33
122599499181,14cyclictest0-21swapper/33
122599499181,14cyclictest0-21swapper/33
122599499181,14cyclictest0-21swapper/33
122599499181,14cyclictest0-21swapper/33
122599499181,14cyclictest0-21swapper/33
122599499181,14cyclictest0-21swapper/33
122599499181,14cyclictest0-21swapper/33
122599499181,14cyclictest0-21swapper/33
122599499181,14cyclictest0-21swapper/33
122599499181,13cyclictest0-21swapper/33
122599499181,13cyclictest0-21swapper/33
122599499180,2cyclictest0-21swapper/33
122599499180,15cyclictest0-21swapper/33
122599499180,14cyclictest0-21swapper/33
122599499180,13cyclictest0-21swapper/33
16365722171,3sleep00-21swapper/00
16100222170,3sleep00-21swapper/00
15968872176,7sleep21598472-21cat2
14891442171,5sleep01489364-21hddtemp_smartct0
13073222171,5sleep11307423-21ntpq1
122599499172,11cyclictest1548100-21taskset3
122599499171,13cyclictest1637268-21taskset3
122599499171,13cyclictest0-21swapper/33
122599499171,13cyclictest0-21swapper/33
122599499170,14cyclictest66950irq/132-enp1s0-TxRx-33
122599499170,14cyclictest0-21swapper/33
122599499170,14cyclictest0-21swapper/33
122599499170,14cyclictest0-21swapper/33
16691832161,9sleep01669226-21ntpq0
16096902161,2sleep20-21swapper/22
15757022161,2sleep10-21swapper/11
15318002161,7sleep21356374-21diskmemload2
15035922161,11sleep01503603-21ssh0
13992702161,3sleep20-21swapper/22
122599499167,5cyclictest1242939-21taskset3
1225994991614,1cyclictest0-21swapper/33
122599499161,3cyclictest0-21swapper/33
122599499161,12cyclictest1330305-21taskset3
122599499160,14cyclictest0-21swapper/33
122599499160,14cyclictest0-21swapper/33
122599499160,13cyclictest0-21swapper/33
16604702151,8sleep21660514-21ntpq2
15647792151,4sleep11356374-21diskmemload1
14401672150,1sleep00-21swapper/00
13998282151,2sleep10-21swapper/11
13353392150,3sleep01335358-21apt-get0
122599499150,13cyclictest0-21swapper/33
122599499150,12cyclictest0-21swapper/33
122599499150,12cyclictest0-21swapper/33
122599499150,12cyclictest0-21swapper/33
16709712141,4sleep21356374-21diskmemload2
16303932141,7sleep21630473-21irqstats2
15490622140,2sleep20-21swapper/22
15483152141,10sleep00-21swapper/00
15364382140,3sleep10-21swapper/11
15055032140,1sleep20-21swapper/22
14663662140,9sleep11466424-21ntpq1
14524652141,3sleep01452472-21ssh0
14418852141,3sleep11356374-21diskmemload1
14339122141,3sleep11433926-21ssh1
14147212141,3sleep21356374-21diskmemload2
14015912142,7sleep21403196-21grep2
13813582140,2sleep20-21swapper/22
13637722141,9sleep11363782-21ssh1
122599499148,3cyclictest12761512sleep33
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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