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2026-04-20 - 16:00

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 100 highest latencies:
System rackcslot8s.osadl.org (updated Mon Apr 20, 2026 12:46:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
111391620,31ptp4l0-21swapper/007:07:370
271822600,0sleep30-21swapper/310:27:143
18802590,0sleep30-21swapper/312:10:003
170982590,0sleep4471rcuc/409:27:474
161682590,0sleep60-21swapper/610:10:596
1881915433,7phc2sys0-21swapper/307:09:293
111391540,5ptp4l0-21swapper/407:07:094
1239525342,7sleep20-21swapper/207:07:302
1227425240,7sleep10-21swapper/107:05:511
1252524938,6sleep60-21swapper/607:09:106
1233624939,6sleep70-21swapper/707:06:477
1253524736,6sleep50-21swapper/507:09:175
111391330,4ptp4l0-21swapper/409:38:254
111391320,0ptp4l0-21swapper/412:35:044
111391320,0ptp4l0-21swapper/410:50:114
111391320,0ptp4l0-21swapper/409:22:084
111391320,0ptp4l0-21swapper/312:10:133
111391320,0ptp4l0-21swapper/011:00:120
111391320,0ptp4l0-21swapper/008:35:130
111391320,0ptp4l0-21swapper/008:00:120
111391310,0ptp4l0-21swapper/510:55:195
111391310,0ptp4l0-21swapper/412:31:064
111391310,0ptp4l0-21swapper/411:25:114
111391310,0ptp4l0-21swapper/411:02:164
111391310,0ptp4l0-21swapper/410:37:404
111391310,0ptp4l0-21swapper/410:30:114
111391310,0ptp4l0-21swapper/012:02:370
111391310,0ptp4l0-21swapper/011:36:340
111391310,0ptp4l0-21swapper/010:35:130
111391310,0ptp4l0-21swapper/010:29:400
111391310,0ptp4l0-21swapper/010:19:380
111391310,0ptp4l0-21swapper/009:45:170
111391300,0ptp4l0-21swapper/511:34:265
111391300,0ptp4l0-21swapper/411:12:514
111391300,0ptp4l0-21swapper/410:21:224
111391300,0ptp4l0-21swapper/409:30:524
111391300,0ptp4l0-21swapper/011:50:150
111391300,0ptp4l0-21swapper/010:46:520
111391300,0ptp4l0-21swapper/010:46:520
111391290,2ptp4l0-21swapper/412:26:394
111391290,2ptp4l0-21swapper/008:10:190
111391290,2ptp4l0-21swapper/008:10:190
111391290,0ptp4l0-21swapper/411:50:324
111391290,0ptp4l0-21swapper/410:49:354
111391290,0ptp4l0-21swapper/410:49:354
111391290,0ptp4l0-21swapper/410:10:034
111391290,0ptp4l0-21swapper/410:03:534
111391290,0ptp4l0-21swapper/409:43:004
111391290,0ptp4l0-21swapper/012:15:120
111391290,0ptp4l0-21swapper/011:40:320
111391290,0ptp4l0-21swapper/011:32:320
111391290,0ptp4l0-21swapper/010:22:350
111391290,0ptp4l0-21swapper/009:54:310
111391290,0ptp4l0-21swapper/009:31:160
111391280,0ptp4l0-21swapper/509:56:165
111391280,0ptp4l0-21swapper/509:16:215
111391280,0ptp4l0-21swapper/411:24:204
111391280,0ptp4l0-21swapper/411:08:204
111391280,0ptp4l0-21swapper/410:16:594
111391280,0ptp4l0-21swapper/012:23:250
111391280,0ptp4l0-21swapper/011:45:540
111391280,0ptp4l0-21swapper/011:22:010
111391280,0ptp4l0-21swapper/011:16:500
111391280,0ptp4l0-21swapper/010:12:570
111391280,0ptp4l0-21swapper/008:24:420
111391270,2ptp4l0-21swapper/412:01:054
111391270,0ptp4l0-21swapper/609:31:256
111391270,0ptp4l0-21swapper/510:17:315
111391270,0ptp4l0-21swapper/411:43:224
111391270,0ptp4l0-21swapper/411:33:134
111391270,0ptp4l0-21swapper/409:16:524
111391270,0ptp4l0-21swapper/109:21:091
111391260,1ptp4l32521-21irqrtprio07:50:154
111391260,0ptp4l0-21swapper/709:12:197
111391260,0ptp4l0-21swapper/511:12:415
111391260,0ptp4l0-21swapper/410:58:274
111391260,0ptp4l0-21swapper/410:41:424
111391260,0ptp4l0-21swapper/408:51:134
111391260,0ptp4l0-21swapper/407:55:194
111391260,0ptp4l0-21swapper/309:54:533
111391260,0ptp4l0-21swapper/012:39:550
111391260,0ptp4l0-21swapper/012:05:110
111391260,0ptp4l0-21swapper/011:56:140
111391260,0ptp4l0-21swapper/011:11:400
111391260,0ptp4l0-21swapper/010:58:280
111391260,0ptp4l0-21swapper/009:43:180
111391260,0ptp4l0-21swapper/009:35:490
111391260,0ptp4l0-21swapper/008:55:270
111391260,0ptp4l0-21swapper/007:50:440
111391250,4ptp4l3628-21diskmemload11:41:462
111391250,0ptp4l0-21swapper/510:35:395
111391250,0ptp4l0-21swapper/508:05:205
111391250,0ptp4l0-21swapper/412:18:014
111391250,0ptp4l0-21swapper/411:19:334
111391250,0ptp4l0-21swapper/410:05:184
111391250,0ptp4l0-21swapper/409:48:454
111391250,0ptp4l0-21swapper/409:08:274
111391250,0ptp4l0-21swapper/408:15:534
111391250,0ptp4l0-21swapper/408:12:264
111391250,0ptp4l0-21swapper/408:12:254
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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