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2026-06-15 - 19:03

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #5

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 20 highest latencies:
System rackeslot5s.osadl.org (updated Mon Jun 15, 2026 00:44:25)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2263699330,0cyclictest0-21swapper/022:39:440
2263899260,1cyclictest16748-21diskmemload21:50:212
22637992621,2cyclictest15781-21ls22:10:001
22639992522,2cyclictest26251-21sh21:49:493
2263899250,24cyclictest753-21ssh23:29:212
2263899250,24cyclictest0-21swapper/223:53:162
2263899250,24cyclictest0-21swapper/223:42:582
2263799250,24cyclictest15834-21ssh23:12:061
22639992422,1cyclictest16748-21diskmemload00:14:503
22639992421,2cyclictest23496-21idleruntime-cro00:20:013
2263999240,2cyclictest313-21systemd-journal20:30:003
2263999240,24cyclictest0-21swapper/322:37:553
2263999240,23cyclictest16748-21diskmemload23:01:003
2263999240,0cyclictest0-21swapper/322:34:463
22638992422,1cyclictest22483-21ssh22:47:592
22638992422,1cyclictest0-21swapper/200:29:452
2263899240,23cyclictest3423-21ssh23:30:262
22637992422,1cyclictest2387-21ssh00:31:031
22637992421,2cyclictest24011-21ssh21:47:561
2263799241,22cyclictest32464-21perf21:55:011
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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