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2026-05-29 - 22:19

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, 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.

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 rack7slot3s.osadl.org (updated Fri May 29, 2026 12:43:36)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
29502998615,26cyclictest0-21swapper/009:50:180
2950299857,35cyclictest29573-21ssh11:40:180
241962810,2sleep20-21swapper/210:55:372
42462790,5sleep12950399cyclictest11:09:571
150392750,5sleep22950499cyclictest10:07:582
29502997424,10cyclictest0-21swapper/011:50:180
29502997424,10cyclictest0-21swapper/011:50:180
29502997215,32cyclictest9-21ksoftirqd/011:30:180
197282700,1sleep20-21swapper/208:35:352
110402680,5sleep32950599cyclictest09:25:233
2950499674,11cyclictest0-21swapper/209:55:172
2950299677,52cyclictest0-21swapper/012:15:180
2950299671,37cyclictest6468-21aten_rbpower_po09:20:190
29504996523,26cyclictest6510-21/usr/sbin/munin10:35:302
29503996410,4cyclictest0-21swapper/111:02:471
2950299642,30cyclictest25264-21ssh10:20:170
2950499638,13cyclictest7850irq/56-dwc_otg12:00:172
2950299637,43cyclictest0-21swapper/011:45:180
29502996217,6cyclictest0-21swapper/011:35:160
2950399618,4cyclictest0-21swapper/112:36:311
2950399617,5cyclictest27190-21/usr/sbin/munin09:00:261
2950299615,43cyclictest0-21swapper/010:45:050
2950399601,7cyclictest30407-21aten_rbpower_vo12:20:191
29503996010,6cyclictest31559-21sed09:10:361
29502996014,24cyclictest30266-21systemd-cgroups11:01:090
2950499595,29cyclictest0-21swapper/212:35:152
2950399597,17cyclictest0-21swapper/110:20:181
2950399596,5cyclictest7850irq/56-dwc_otg12:00:221
2950399591,4cyclictest7850irq/56-dwc_otg11:25:231
29502995937,5cyclictest8050irq/56-dwc_otg_12:25:270
2950299593,14cyclictest5653-21ssh10:35:170
29502995920,9cyclictest13-21rcuc/010:30:170
2950299591,31cyclictest0-21swapper/011:15:150
29504995818,24cyclictest6563-21cpuspeed09:20:192
29503995826,20cyclictest221ktimersoftd/111:55:181
29502995832,3cyclictest0-21swapper/012:20:330
2950299582,7cyclictest28096-21munin-run09:05:050
2950299582,35cyclictest28048-21sort09:45:260
29504995725,15cyclictest15374-21ssh11:22:332
29504995725,15cyclictest15374-21ssh11:22:332
29504995722,16cyclictest4682-21sh11:49:242
29504995721,14cyclictest2775-21chrt09:53:532
29504995720,12cyclictest11926-21sed09:25:352
2950399577,7cyclictest0-21swapper/112:19:361
2950399571,27cyclictest15241-21cut09:30:221
2950299574,24cyclictest141-21systemd-journal12:05:170
29502995730,17cyclictest24047-21unixbench-2d10:55:340
2950299572,7cyclictest1133-21runrttasks09:15:060
2950299572,5cyclictest0-21swapper/009:30:180
2950299572,30cyclictest0-21swapper/010:15:310
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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