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2026-03-20 - 14:17

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 Fri Mar 20, 2026 00:44:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
27310012246181,21sleep30-21swapper/319:05:033
27310002222182,26sleep20-21swapper/219:05:022
27333952220187,21sleep40-21swapper/419:09:144
27332752217184,21sleep50-21swapper/519:07:295
27333822211178,22sleep00-21swapper/019:09:010
27332182211184,17sleep70-21swapper/719:06:437
27332622209176,21sleep10-21swapper/119:07:171
27331902209180,18sleep60-21swapper/619:06:186
273368799270,22cyclictest2780250-21apt-get20:30:003
2733691992622,3cyclictest2872827-21dpkg23:10:004
273369899250,24cyclictest0-21swapper/721:15:117
2733696992524,1cyclictest0-21swapper/621:15:006
2733687992521,3cyclictest0-21swapper/321:25:133
273368799250,24cyclictest2878161-21munin-run23:20:003
273368799250,21cyclictest0-21swapper/322:55:123
273368799250,1cyclictest0-21swapper/323:20:113
273368299250,24cyclictest2765996-21idleruntime-cro20:05:011
2733693992422,1cyclictest2800523-21munin-run21:05:015
273369399240,24cyclictest2912982-21apt-get00:19:595
2733687992421,3cyclictest0-21swapper/323:45:123
2733687992418,5cyclictest0-21swapper/320:00:013
273368799240,23cyclictest2800517-21turbostat21:05:003
273368799240,23cyclictest0-21swapper/321:15:103
273368799240,0cyclictest0-21swapper/300:35:123
273368299240,23cyclictest0-21swapper/100:15:131
273368099240,23cyclictest0-21swapper/022:30:100
2733698992321,0cyclictest0-21swapper/723:25:117
2733696992321,2cyclictest1-21systemd00:00:016
273369699230,2cyclictest2809384-21awk21:20:006
273369699230,23cyclictest2895575-21perf23:49:596
273369699230,22cyclictest2857931-21awk22:45:006
273369699230,22cyclictest0-21swapper/619:50:116
2733693992322,0cyclictest0-21swapper/523:25:115
273369399230,22cyclictest2890286-21apt-get23:40:115
273369399230,1cyclictest2751686-21munin-run19:40:005
273369199230,22cyclictest2771683-21awk20:15:014
273369199230,22cyclictest2771683-21awk20:15:014
273369199230,22cyclictest0-21swapper/422:30:164
2733687992323,0cyclictest0-21swapper/323:10:113
2733687992321,2cyclictest0-21swapper/322:30:113
2733687992321,1cyclictest2769250-21apt-get20:10:133
2733687992321,1cyclictest2769250-21apt-get20:10:123
273368799230,22cyclictest2818331-21apt-get21:35:123
273368799230,22cyclictest0-21swapper/320:55:013
273368799230,1cyclictest0-21swapper/320:45:123
273368799230,0cyclictest0-21swapper/320:05:113
273368799230,0cyclictest0-21swapper/320:05:113
273368599230,1cyclictest2864034-21apt-get22:55:122
2733682992321,1cyclictest2895988-21apt-get23:50:111
273368299230,22cyclictest2835066-21perf22:05:001
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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