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2026-03-12 - 04:22

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #3

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 rack5slot3s.osadl.org (updated Thu Mar 12, 2026 00:44:27)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
297072184116,59sleep00-21swapper/019:05:220
30405217392,24sleep20-21swapper/219:08:262
289112155125,20sleep30-21swapper/319:05:143
303412152116,24sleep10-21swapper/119:07:371
252192820,3sleep33063199cyclictest23:50:113
237552620,3sleep081ktimersoftd/023:45:200
3063199401,23cyclictest2019-21hddtemp_smartct19:15:153
3063199371,12cyclictest0-21swapper/320:56:293
30631993524,3cyclictest0-21swapper/322:44:343
3063199311,13cyclictest22549-21irqstats21:15:183
3061399316,12cyclictest7978-21munin-run00:25:000
3061399315,12cyclictest15546-21perf22:15:010
3061399314,12cyclictest674-21awk22:55:010
3063199301,16cyclictest0-21swapper/322:55:163
3063199301,12cyclictest0-21swapper/319:47:443
3063199301,12cyclictest0-21swapper/319:42:583
3063199301,10cyclictest19313-21diskmemload21:10:003
3063199301,10cyclictest19313-21diskmemload21:10:003
3061899307,3cyclictest31838-21kworker/1:119:40:121
3061399301,14cyclictest330-21perf19:15:020
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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