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2026-04-11 - 17:23

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 Sat Apr 11, 2026 12:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3870495212262,56sleep30-21swapper/33
15783721170,2sleep20-21swapper/22
413868521130,2sleep20-21swapper/22
387039328758,10sleep20-21swapper/22
423782810,6sleep0171rcu_preempt0
386576728060,12sleep10-21swapper/11
387071727555,14sleep00-21swapper/00
3870871992521,2cyclictest0-21swapper/33
387087199221,7cyclictest3920793-21taskset3
1661492221,6sleep14001338-21diskmemload1
387087199211,16cyclictest138690-21taskset3
387087199211,14cyclictest0-21swapper/33
41589512201,8sleep04001338-21diskmemload0
41482272201,8sleep24001338-21diskmemload2
39253502206,8sleep1766-21ntpd1
387087199209,7cyclictest0-21swapper/33
387087199201,16cyclictest0-21swapper/33
387087199201,15cyclictest4107081-21taskset3
387087199201,15cyclictest0-21swapper/33
387087199201,15cyclictest0-21swapper/33
387087199201,15cyclictest0-21swapper/33
387087199200,18cyclictest0-21swapper/33
387087199200,17cyclictest0-21swapper/33
387087199197,9cyclictest3953032-21turbostat3
3870871991912,5cyclictest0-21swapper/33
3870871991912,4cyclictest185432chrt3
3870871991911,5cyclictest4070943-21chrt3
387087199191,14cyclictest3893017-21taskset3
387087199191,14cyclictest0-21swapper/33
387087199191,14cyclictest0-21swapper/33
387087199191,14cyclictest0-21swapper/33
387087199191,14cyclictest0-21swapper/33
387087199191,14cyclictest0-21swapper/33
387087199191,13cyclictest0-21swapper/33
3870871991910,6cyclictest4157061-21taskset3
3870871991910,6cyclictest4087122-21taskset3
387087199190,16cyclictest0-21swapper/33
41921342181,2sleep10-21swapper/11
41747372181,3sleep00-21swapper/00
387087199181,15cyclictest0-21swapper/33
387087199181,14cyclictest0-21swapper/33
387087199181,14cyclictest0-21swapper/33
387087199181,14cyclictest0-21swapper/33
387087199181,14cyclictest0-21swapper/33
387087199181,14cyclictest0-21swapper/33
387087199181,14cyclictest0-21swapper/33
387087199181,14cyclictest0-21swapper/33
387087199181,14cyclictest0-21swapper/33
387087199181,14cyclictest0-21swapper/33
387087199181,14cyclictest0-21swapper/33
387087199181,14cyclictest0-21swapper/33
387087199181,14cyclictest0-21swapper/33
387087199181,13cyclictest0-21swapper/33
387087199181,13cyclictest0-21swapper/33
387087199181,13cyclictest0-21swapper/33
387087199181,13cyclictest0-21swapper/33
387087199181,13cyclictest0-21swapper/33
387087199181,13cyclictest0-21swapper/33
387087199180,16cyclictest0-21swapper/33
387087199180,16cyclictest0-21swapper/33
39485502171,7sleep23949563-21tr2
387087199171,14cyclictest3876121-21turbostat3
387087199171,13cyclictest0-21swapper/33
387087199170,14cyclictest0-21swapper/33
387087199170,14cyclictest0-21swapper/33
387087199170,14cyclictest0-21swapper/33
387087199170,13cyclictest0-21swapper/33
387087199170,13cyclictest0-21swapper/33
274732171,3sleep00-21swapper/00
1663392171,8sleep0166352-21sh0
980762161,10sleep14001338-21diskmemload1
801232161,4sleep04001338-21diskmemload0
617922161,3sleep20-21swapper/22
41934922161,4sleep04193506-21ssh0
41383472161,10sleep14138406-21ntpq1
41225732161,2sleep00-21swapper/00
41225732161,2sleep00-21swapper/00
40720542161,10sleep24072086-21munin-run2
40687312161,5sleep14001338-21diskmemload1
40624432161,3sleep20-21swapper/22
40096552161,4sleep14001338-21diskmemload1
39163352160,2sleep20-21swapper/22
387087199161,3cyclictest0-21swapper/33
387087199160,14cyclictest0-21swapper/33
387087199160,13cyclictest0-21swapper/33
387087199160,13cyclictest0-21swapper/33
387087199160,13cyclictest0-21swapper/33
354562161,3sleep00-21swapper/00
1651872161,3sleep20-21swapper/22
969322151,2sleep20-21swapper/22
41060502151,3sleep24001338-21diskmemload2
40069092151,4sleep04006921-21sshd0
387087199151,3cyclictest0-21swapper/33
387087199150,13cyclictest0-21swapper/33
387087199150,12cyclictest0-21swapper/33
387087199150,12cyclictest0-21swapper/33
387087199150,11cyclictest0-21swapper/33
1749442151,2sleep00-21swapper/00
1726812151,4sleep2172740-21ntpq2
1505562150,2sleep10-21swapper/11
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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