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2026-05-01 - 04:09

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 30, 2026 00:44:44)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2566802244173,22sleep00-21swapper/019:09:130
2564772240168,60sleep10-21swapper/119:06:171
2567142228166,19sleep70-21swapper/719:09:447
2565722226162,18sleep40-21swapper/419:07:414
2542162217183,23sleep60-21swapper/619:05:096
2564502215181,22sleep30-21swapper/319:05:553
2565372213184,19sleep50-21swapper/519:07:095
2565052212182,20sleep20-21swapper/219:06:422
256948992723,3cyclictest281203-21idleruntime-cro19:50:016
256948992723,3cyclictest281203-21idleruntime-cro19:50:016
25693899270,25cyclictest45-21ksoftirqd/219:50:012
25693899270,25cyclictest45-21ksoftirqd/219:50:012
25694899260,25cyclictest366-21systemd-journal19:40:016
25694499260,25cyclictest400358-21awk00:00:014
25693899260,24cyclictest407823-21idleruntime-cro00:20:002
256950992521,3cyclictest377246-21turbostat22:55:017
25694899250,24cyclictest407017-21apt-get00:15:056
25694799250,24cyclictest346072-21grep21:40:025
256944992520,4cyclictest385454-21dump-pmu-power23:20:014
256938992521,3cyclictest45-21ksoftirqd/220:15:122
256934992520,4cyclictest263508-21perf19:20:010
25693499250,1cyclictest352395-21apt-get21:50:140
256950992422,1cyclictest0-21swapper/719:45:017
25695099240,24cyclictest346066-21turbostat21:40:027
25695099240,1cyclictest0-21swapper/719:50:027
25695099240,1cyclictest0-21swapper/719:50:017
256948992420,3cyclictest384680-21idleruntime-cro23:15:016
25694899240,23cyclictest354902-21apt-get21:55:046
25694799240,2cyclictest769-21dbus-daemon00:40:015
256944992423,1cyclictest0-21swapper/421:30:134
25694499240,23cyclictest0-21swapper/423:40:134
25694499240,23cyclictest0-21swapper/422:20:014
25694499240,23cyclictest0-21swapper/421:35:134
256942992422,1cyclictest385895-21apt-get23:20:133
25694299240,24cyclictest0-21swapper/321:40:173
25694299240,23cyclictest359744-21tar22:10:013
256938992421,2cyclictest269400-21ls19:30:012
25693899240,23cyclictest287111-21idleruntime-cro20:00:012
25693899240,23cyclictest287111-21idleruntime-cro20:00:002
25693899240,23cyclictest0-21swapper/220:30:122
25693899240,23cyclictest0-21swapper/220:20:142
25693699240,24cyclictest0-21swapper/100:20:131
256950992322,1cyclictest281256-21appstreamcli19:50:047
256950992322,1cyclictest281256-21appstreamcli19:50:047
25695099230,23cyclictest0-21swapper/721:20:187
25695099230,23cyclictest0-21swapper/719:55:127
25695099230,23cyclictest0-21swapper/719:55:127
25695099230,22cyclictest346513-21apt-get21:40:127
25695099230,22cyclictest293442-21apt-get20:10:157
25695099230,22cyclictest0-21swapper/721:30:127
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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