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2026-04-16 - 17:13

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 Thu Apr 16, 2026 12:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
350975022480,2sleep0471rcuog/20
3265640212265,53sleep30-21swapper/33
326560928452,12sleep10-21swapper/11
326566127958,15sleep00-21swapper/00
326562827658,12sleep20-21swapper/22
35617912230,2sleep20-21swapper/22
36508602221,6sleep23651182-21grep2
34634312221,17sleep23396333-21diskmemload2
35602682211,4sleep00-21swapper/00
326580199215,12cyclictest0-21swapper/33
3265801992116,2cyclictest0-21swapper/33
35086992201,10sleep13396333-21diskmemload1
326580199205,12cyclictest3289216-21taskset3
326580199201,6cyclictest3455008-21taskset3
326580199201,3cyclictest0-21swapper/33
3265801992011,5cyclictest0-21swapper/33
326580199201,15cyclictest0-21swapper/33
326580199201,15cyclictest0-21swapper/33
326580199201,14cyclictest0-21swapper/33
326580199200,1cyclictest0-21swapper/33
326580199199,6cyclictest35519532sleep33
326580199191,15cyclictest0-21swapper/33
326580199191,15cyclictest0-21swapper/33
326580199191,14cyclictest3310864-21taskset3
326580199191,14cyclictest0-21swapper/33
326580199191,14cyclictest0-21swapper/33
326580199191,14cyclictest0-21swapper/33
326580199191,14cyclictest0-21swapper/33
326580199191,14cyclictest0-21swapper/33
326580199191,14cyclictest0-21swapper/33
326580199191,14cyclictest0-21swapper/33
326580199191,14cyclictest0-21swapper/33
326580199190,17cyclictest0-21swapper/33
326580199190,16cyclictest0-21swapper/33
35012052181,3sleep20-21swapper/22
326580199181,14cyclictest3641741-21taskset3
326580199181,14cyclictest0-21swapper/33
326580199181,14cyclictest0-21swapper/33
326580199181,14cyclictest0-21swapper/33
326580199181,14cyclictest0-21swapper/33
326580199181,14cyclictest0-21swapper/33
326580199181,14cyclictest0-21swapper/33
326580199181,14cyclictest0-21swapper/33
326580199181,14cyclictest0-21swapper/33
326580199181,14cyclictest0-21swapper/33
326580199181,14cyclictest0-21swapper/33
326580199181,14cyclictest0-21swapper/33
326580199181,14cyclictest0-21swapper/33
326580199181,13cyclictest0-21swapper/33
326580199181,13cyclictest0-21swapper/33
326580199180,2cyclictest0-21swapper/33
326580199180,14cyclictest0-21swapper/33
36109742171,10sleep03611040-21ntpq0
34985102171,4sleep00-21swapper/00
326580199179,5cyclictest3527401-21turbostat3
3265801991711,4cyclictest0-21swapper/33
326580199171,14cyclictest0-21swapper/33
326580199171,13cyclictest0-21swapper/33
326580199171,13cyclictest0-21swapper/33
326580199171,13cyclictest0-21swapper/33
326580199171,12cyclictest3372580-21taskset3
326580199170,14cyclictest66950irq/132-enp1s0-TxRx-33
326580199170,13cyclictest0-21swapper/33
326580199170,13cyclictest0-21swapper/33
326580199170,13cyclictest0-21swapper/33
36496422161,3sleep20-21swapper/22
35792482160,1sleep00-21swapper/00
35534192160,2sleep20-21swapper/22
35357132161,2sleep00-21swapper/00
34667652161,7sleep23467010-21expr2
3265801991612,2cyclictest0-21swapper/33
326580199161,11cyclictest33428882sleep33
326580199160,13cyclictest0-21swapper/33
37549912151,2sleep00-21swapper/00
37262702151,2sleep20-21swapper/22
36840532150,1sleep20-21swapper/22
36119892151,4sleep13396333-21diskmemload1
34743002151,3sleep13396333-21diskmemload1
34471902151,4sleep00-21swapper/00
326580199151,12cyclictest0-21swapper/33
326580199151,11cyclictest0-21swapper/33
326580199150,13cyclictest0-21swapper/33
37629812141,6sleep23762984-21ssh2
37504132141,7sleep03750480-21ntpq0
37133642141,5sleep10-21swapper/11
36543142141,9sleep13654460-21/usr/sbin/munin1
35953422140,5sleep13595353-21ssh1
35796222141,9sleep23579634-21ssh2
34918422141,5sleep23491856-21ssh2
34754752143,6sleep23475496-21apt-get2
346521521410,1sleep00-21swapper/00
34565822141,2sleep13396333-21diskmemload1
34485052141,3sleep13396333-21diskmemload1
3265801991412,1cyclictest0-21swapper/33
3265801991412,1cyclictest0-21swapper/33
3265801991411,1cyclictest0-21swapper/33
326580199141,11cyclictest0-21swapper/33
326580199140,2cyclictest0-21swapper/33
326580199140,12cyclictest0-21swapper/33
326580199140,12cyclictest0-21swapper/33
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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