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2026-04-03 - 15:20

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 Apr 03, 2026 12:44:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
28700882221187,22sleep60-21swapper/607:08:576
28699692220162,19sleep20-21swapper/207:07:162
28700542219186,21sleep40-21swapper/407:08:314
28700052215178,24sleep00-21swapper/007:07:470
28699072215187,18sleep50-21swapper/507:06:235
28701012214181,21sleep10-21swapper/107:09:081
28698962211178,21sleep30-21swapper/307:06:133
28699652210175,23sleep70-21swapper/707:07:137
287038899280,2cyclictest2899574-21dump-pmu-power08:00:010
2870405992620,5cyclictest2919852-21perf08:35:006
287040599260,1cyclictest0-21swapper/608:40:126
2870396992624,1cyclictest2931259-21sh08:55:003
287038899260,25cyclictest3026834-21perf11:40:000
287038899260,22cyclictest3055675-21awk12:30:000
287038899260,1cyclictest3018692-21apt-get11:25:120
2870408992521,3cyclictest0-21swapper/708:35:117
2870405992521,3cyclictest2987267-21apt-get10:30:106
2870408992421,2cyclictest2952040-21sh09:30:007
287040599240,23cyclictest2957772-21awk09:40:006
2870402992423,1cyclictest0-21swapper/512:25:005
2870402992422,1cyclictest2885700-21apt-get07:35:125
287040299240,1cyclictest2891014-21apt07:45:015
287039699240,23cyclictest2893891-21idleruntime-cro07:50:013
2870394992423,1cyclictest2960619-21dump-pmu-power09:45:002
2870390992424,0cyclictest0-21swapper/107:45:111
287039099240,23cyclictest0-21swapper/108:25:121
2870388992420,3cyclictest2957774-21turbostat09:40:000
287038899240,23cyclictest3047083-21turbostat12:15:000
287038899240,23cyclictest2917003-21awk08:30:000
2870408992319,4cyclictest0-21swapper/709:20:007
287040899230,23cyclictest2989713-21awk10:35:017
287040899230,20cyclictest0-21swapper/712:30:107
2870405992321,1cyclictest0-21swapper/607:45:016
287040599230,22cyclictest2986852-21grep10:30:006
287040299230,22cyclictest2992991-21apt-get10:40:115
287040299230,22cyclictest0-21swapper/510:55:005
287040299230,22cyclictest0-21swapper/510:50:005
287039999230,22cyclictest3057320-21ntpq12:30:164
287039999230,1cyclictest0-21swapper/407:30:104
2870396992321,1cyclictest2981130-21munin-run10:20:003
287039699230,22cyclictest3061366-21turbostat12:40:003
287039699230,22cyclictest3054427-21ntpq12:25:193
287039699230,22cyclictest3007263-21apt-get11:05:123
287039699230,22cyclictest0-21swapper/310:05:003
287039699230,22cyclictest0-21swapper/308:10:123
287039699230,22cyclictest0-21swapper/307:15:013
2870394992323,0cyclictest0-21swapper/210:20:122
2870394992321,1cyclictest2917415-21apt-get08:30:122
2870394992321,1cyclictest2894295-21apt-get07:50:112
287039499230,22cyclictest2969174-21apt-get10:00:012
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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