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2026-04-09 - 10:59

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #8, slot #4

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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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

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 50 highest latencies:
System rack8slot4s.osadl.org (updated Thu Apr 09, 2026 00:44:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
35547022250168,40sleep70-21swapper/719:06:567
35524742231175,45sleep30-21swapper/319:05:073
35547102222164,20sleep60-21swapper/619:07:036
35548562216158,19sleep40-21swapper/419:09:094
35548192208179,19sleep50-21swapper/519:08:385
35547502208179,18sleep10-21swapper/119:07:381
35548822207174,21sleep20-21swapper/219:09:322
35547782202167,22sleep00-21swapper/019:08:020
355516699295,23cyclictest3711619-21idleruntime-cro23:40:017
355515299280,2cyclictest363-21systemd-journal19:30:012
355515299280,1cyclictest0-21swapper/222:49:592
355515299270,26cyclictest0-21swapper/220:55:002
355515299270,23cyclictest3628233-21idleruntime-cro21:15:002
355515299270,1cyclictest3613680-21munin-run20:50:002
355515299270,0cyclictest0-21swapper/220:35:102
355515299260,25cyclictest0-21swapper/221:04:592
355515299260,22cyclictest0-21swapper/200:30:122
3555163992523,1cyclictest3596001-21cron20:19:596
355516399250,24cyclictest3679672-21perf22:45:006
355516199250,24cyclictest3712043-21apt-get23:40:105
355516199250,23cyclictest0-21swapper/519:15:015
355515799250,24cyclictest3573162-21basename19:40:004
3555152992523,1cyclictest0-21swapper/220:00:012
355515299250,1cyclictest0-21swapper/219:50:112
355514699250,24cyclictest0-21swapper/020:50:110
355516699240,23cyclictest0-21swapper/722:40:007
3555163992422,1cyclictest3665802-21apt-get22:20:116
3555163992421,2cyclictest3587468-21idleruntime-cro20:05:016
355516399240,23cyclictest0-21swapper/623:15:026
355516399240,1cyclictest3723284-21apt00:00:006
355515599240,23cyclictest3567456-21perf19:30:013
355515599240,23cyclictest0-21swapper/321:40:123
355515599240,23cyclictest0-21swapper/319:40:103
3555152992421,2cyclictest0-21swapper/221:15:132
355515299240,1cyclictest0-21swapper/222:20:102
355515299240,0cyclictest0-21swapper/221:55:112
3555150992423,1cyclictest0-21swapper/123:55:001
355514699240,23cyclictest0-21swapper/021:40:110
355514699240,0cyclictest0-21swapper/023:00:140
355514699240,0cyclictest0-21swapper/023:00:140
355516699230,22cyclictest3607439-21munin-run20:40:007
355516699230,22cyclictest0-21swapper/721:45:137
3555163992321,1cyclictest0-21swapper/619:55:016
355516399230,22cyclictest0-21swapper/623:45:026
355516399230,1cyclictest0-21swapper/621:20:006
355516199230,22cyclictest3718006-21apt-get23:50:115
355516199230,22cyclictest0-21swapper/521:25:125
3555157992321,1cyclictest3708758-21perf23:35:014
355515599230,22cyclictest0-21swapper/300:05:113
355515599230,21cyclictest0-21swapper/322:25:143
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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