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2026-04-15 - 15:14

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, slot #8

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 rackcslot8s.osadl.org (updated Wed Apr 15, 2026 12:46:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
111391640,5ptp4l0-21swapper/007:09:560
111391570,5ptp4l0-21swapper/407:08:294
2650625544,6sleep20-21swapper/207:09:562
2613425544,6sleep70-21swapper/707:05:207
2585325434,6sleep60-21swapper/607:05:206
2642524735,8sleep30-21swapper/307:08:533
2614724737,6sleep10-21swapper/107:05:221
2616824433,7sleep50-21swapper/507:05:345
111391350,3ptp4l0-21swapper/710:25:157
111391350,0ptp4l0-21swapper/412:39:564
111391330,0ptp4l0-21swapper/110:15:171
111391320,1ptp4l3153-21sh11:05:140
111391320,0ptp4l0-21swapper/712:23:207
111391310,0ptp4l0-21swapper/709:35:137
111391290,0ptp4l0-21swapper/710:39:387
111391290,0ptp4l0-21swapper/611:12:216
111391290,0ptp4l0-21swapper/510:30:155
111391290,0ptp4l0-21swapper/509:35:405
111391290,0ptp4l0-21swapper/412:15:114
111391290,0ptp4l0-21swapper/411:53:144
111391290,0ptp4l0-21swapper/409:37:254
111391290,0ptp4l0-21swapper/312:37:273
111391290,0ptp4l0-21swapper/311:44:193
111391290,0ptp4l0-21swapper/311:44:193
111391290,0ptp4l0-21swapper/310:38:403
111391290,0ptp4l0-21swapper/309:31:223
111391290,0ptp4l0-21swapper/011:31:210
111391290,0ptp4l0-21swapper/009:33:470
111391290,0ptp4l0-21swapper/009:28:260
111391280,0ptp4l0-21swapper/712:38:187
111391280,0ptp4l0-21swapper/712:27:317
111391280,0ptp4l0-21swapper/711:24:047
111391280,0ptp4l0-21swapper/709:12:087
111391280,0ptp4l0-21swapper/410:31:414
111391280,0ptp4l0-21swapper/409:49:014
111391280,0ptp4l0-21swapper/409:22:304
111391280,0ptp4l0-21swapper/310:43:293
111391280,0ptp4l0-21swapper/308:40:193
111391280,0ptp4l0-21swapper/012:09:580
111391280,0ptp4l0-21swapper/011:29:070
111391280,0ptp4l0-21swapper/010:55:120
111391280,0ptp4l0-21swapper/010:34:530
111391280,0ptp4l0-21swapper/010:07:130
111391280,0ptp4l0-21swapper/009:36:580
111391280,0ptp4l0-21swapper/009:15:360
111391280,0ptp4l0-21swapper/008:25:150
111391270,1ptp4l17542-21diskmemload09:15:133
111391270,0ptp4l0-21swapper/709:46:497
111391270,0ptp4l0-21swapper/709:41:237
111391270,0ptp4l0-21swapper/709:20:047
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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