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2026-04-01 - 14:56

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 Wed Apr 01, 2026 12:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
989511212757,66sleep30-21swapper/33
107761621220,4sleep0221rcuc/00
989769211498,10sleep20-21swapper/22
98947928362,14sleep10-21swapper/11
98947827958,15sleep00-21swapper/00
989972993431,1cyclictest0-21swapper/33
98997299261,3cyclictest0-21swapper/33
10819172260,2sleep00-21swapper/00
98997299250,3cyclictest0-21swapper/33
98997299235,14cyclictest1354355-21taskset3
98997299231,18cyclictest66950irq/132-enp1s0-TxRx-33
98997299231,18cyclictest0-21swapper/33
98997299221,17cyclictest1470574-21taskset3
98997299221,17cyclictest1222008-21taskset3
98997299211,16cyclictest0-21swapper/33
989972992110,7cyclictest1120316-21turbostat3
98997299210,16cyclictest0-21swapper/33
13317842211,7sleep11332051-21df1
98997299201,7cyclictest1451383-21chrt3
989972992016,2cyclictest0-21swapper/33
98997299201,16cyclictest66950irq/132-enp1s0-TxRx-33
98997299201,15cyclictest66950irq/132-enp1s0-TxRx-33
98997299201,15cyclictest0-21swapper/33
98997299201,15cyclictest0-21swapper/33
989972991916,1cyclictest0-21swapper/33
989972991915,2cyclictest0-21swapper/33
989972991912,4cyclictest0-21swapper/33
98997299191,15cyclictest0-21swapper/33
98997299191,15cyclictest0-21swapper/33
98997299191,14cyclictest66950irq/132-enp1s0-TxRx-33
98997299191,14cyclictest0-21swapper/33
98997299191,14cyclictest0-21swapper/33
98997299191,14cyclictest0-21swapper/33
98997299191,14cyclictest0-21swapper/33
12926182191,14sleep21292843-21grep2
12325612191,3sleep20-21swapper/22
989972991815,2cyclictest0-21swapper/33
98997299181,14cyclictest0-21swapper/33
98997299181,14cyclictest0-21swapper/33
98997299181,14cyclictest0-21swapper/33
98997299181,14cyclictest0-21swapper/33
98997299181,14cyclictest0-21swapper/33
98997299181,14cyclictest0-21swapper/33
98997299181,14cyclictest0-21swapper/33
98997299181,14cyclictest0-21swapper/33
98997299181,14cyclictest0-21swapper/33
98997299181,13cyclictest0-21swapper/33
98997299181,13cyclictest0-21swapper/33
98997299180,15cyclictest0-21swapper/33
98997299180,14cyclictest0-21swapper/33
14695692181,7sleep11120300-21diskmemload1
14445602180,2sleep10-21swapper/11
11610952181,3sleep20-21swapper/22
11551762180,12sleep00-21swapper/00
98997299176,8cyclictest1056292-21turbostat3
98997299171,13cyclictest0-21swapper/33
98997299171,13cyclictest0-21swapper/33
98997299171,13cyclictest0-21swapper/33
98997299171,12cyclictest0-21swapper/33
13403972171,5sleep01340409-21sh0
98997299161,12cyclictest0-21swapper/33
98997299161,12cyclictest0-21swapper/33
98997299161,11cyclictest10872632sleep33
98997299160,13cyclictest0-21swapper/33
98997299160,13cyclictest0-21swapper/33
98997299160,13cyclictest0-21swapper/33
98997299160,12cyclictest0-21swapper/33
98997299160,12cyclictest0-21swapper/33
98997299160,12cyclictest0-21swapper/33
98997299160,12cyclictest0-21swapper/33
98997299160,12cyclictest0-21swapper/33
14682212161,4sleep21120300-21diskmemload2
13135822161,2sleep20-21swapper/22
12967832161,4sleep21297047-21df2
12104312160,4sleep2421rcuc/22
11610282161,3sleep00-21swapper/00
98997299151,11cyclictest0-21swapper/33
98997299150,12cyclictest0-21swapper/33
98997299150,12cyclictest0-21swapper/33
98997299150,12cyclictest0-21swapper/33
98997299150,12cyclictest0-21swapper/33
14234562151,9sleep11423511-21ssh1
12854882151,3sleep00-21swapper/00
12782192151,2sleep00-21swapper/00
12512442151,2sleep00-21swapper/00
12396332150,1sleep10-21swapper/11
12179562151,9sleep21218068-21perl2
12058322150,1sleep10-21swapper/11
11153842151,9sleep11115494-21diskstats1
10565382150,2sleep20-21swapper/22
98997299140,2cyclictest0-21swapper/33
98997299140,12cyclictest0-21swapper/33
98997299140,11cyclictest0-21swapper/33
98997299140,11cyclictest0-21swapper/33
98997299140,11cyclictest0-21swapper/33
14888012141,4sleep11488815-21ssh1
14417842140,2sleep00-21swapper/00
14240162141,7sleep01424191-21vmstat0
13753812140,2sleep20-21swapper/22
13369742141,4sleep21120300-21diskmemload2
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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