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2026-01-05 - 03:17

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 Sun Jan 04, 2026 12:46:04)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
111391640,4ptp4l0-21swapper/007:05:510
111391610,5ptp4l0-21swapper/407:05:404
1881916050,6phc2sys0-21swapper/207:05:542
400825746,6sleep70-21swapper/707:07:457
32132570,0sleep40-21swapper/410:39:534
240632570,0sleep60-21swapper/607:50:136
395625634,7sleep10-21swapper/107:07:081
99212550,0sleep30-21swapper/311:28:223
388525534,6sleep30-21swapper/307:06:133
384224736,6sleep50-21swapper/507:05:355
224124535,6sleep60-21swapper/607:05:046
111391370,0ptp4l0-21swapper/510:45:015
111391320,0ptp4l0-21swapper/712:19:167
111391320,0ptp4l0-21swapper/111:59:581
111391310,0ptp4l0-21swapper/509:20:195
111391310,0ptp4l0-21swapper/109:11:271
111391300,1ptp4l814-21runrttasks12:38:361
111391300,0ptp4l0-21swapper/512:09:325
111391300,0ptp4l0-21swapper/511:21:315
111391300,0ptp4l0-21swapper/510:42:365
111391300,0ptp4l0-21swapper/510:25:105
111391300,0ptp4l0-21swapper/409:12:554
111391300,0ptp4l0-21swapper/211:40:212
111391290,1ptp4l18258-21ssh11:39:005
111391290,0ptp4l30462-21ssh09:51:131
111391290,0ptp4l27680-21diskmemload09:59:291
111391290,0ptp4l0-21swapper/709:55:117
111391290,0ptp4l0-21swapper/609:12:536
111391290,0ptp4l0-21swapper/511:13:295
111391290,0ptp4l0-21swapper/509:49:215
111391290,0ptp4l0-21swapper/310:45:193
111391290,0ptp4l0-21swapper/111:46:321
111391290,0ptp4l0-21swapper/111:43:541
111391290,0ptp4l0-21swapper/111:34:371
111391290,0ptp4l0-21swapper/110:52:281
111391290,0ptp4l0-21swapper/009:27:420
111391280,2ptp4l0-21swapper/510:37:015
111391280,0ptp4l0-21swapper/512:25:215
111391280,0ptp4l0-21swapper/512:22:275
111391280,0ptp4l0-21swapper/511:32:545
111391280,0ptp4l0-21swapper/411:24:414
111391280,0ptp4l0-21swapper/410:23:414
111391280,0ptp4l0-21swapper/112:28:571
111391280,0ptp4l0-21swapper/111:54:381
111391280,0ptp4l0-21swapper/108:55:101
111391280,0ptp4l0-21swapper/011:30:430
111391280,0ptp4l0-21swapper/011:09:360
111391280,0ptp4l0-21swapper/010:26:100
111391270,0ptp4l0-21swapper/511:58:045
111391270,0ptp4l0-21swapper/511:25:195
111391270,0ptp4l0-21swapper/510:50:465
111391270,0ptp4l0-21swapper/510:04:445
111391270,0ptp4l0-21swapper/509:57:535
111391270,0ptp4l0-21swapper/309:18:073
111391270,0ptp4l0-21swapper/112:34:341
111391270,0ptp4l0-21swapper/111:25:011
111391270,0ptp4l0-21swapper/111:05:311
111391270,0ptp4l0-21swapper/110:35:081
111391270,0ptp4l0-21swapper/109:31:061
111391270,0ptp4l0-21swapper/011:01:550
111391270,0ptp4l0-21swapper/009:55:350
111391270,0ptp4l0-21swapper/009:43:580
111391270,0ptp4l0-21swapper/009:21:560
111391260,0ptp4l8756-21ssh12:06:441
111391260,0ptp4l0-21swapper/710:59:457
111391260,0ptp4l0-21swapper/512:01:015
111391260,0ptp4l0-21swapper/511:16:165
111391260,0ptp4l0-21swapper/410:58:334
111391260,0ptp4l0-21swapper/312:19:093
111391260,0ptp4l0-21swapper/112:10:171
111391260,0ptp4l0-21swapper/111:35:551
111391260,0ptp4l0-21swapper/111:19:581
111391260,0ptp4l0-21swapper/111:04:111
111391260,0ptp4l0-21swapper/109:45:141
111391260,0ptp4l0-21swapper/109:27:281
111391260,0ptp4l0-21swapper/012:14:190
111391260,0ptp4l0-21swapper/011:14:110
111391260,0ptp4l0-21swapper/010:46:360
111391250,0ptp4l0-21swapper/710:53:027
111391250,0ptp4l0-21swapper/609:26:536
111391250,0ptp4l0-21swapper/512:32:305
111391250,0ptp4l0-21swapper/511:43:075
111391250,0ptp4l0-21swapper/510:55:585
111391250,0ptp4l0-21swapper/510:31:575
111391250,0ptp4l0-21swapper/510:23:195
111391250,0ptp4l0-21swapper/510:10:235
111391250,0ptp4l0-21swapper/510:10:225
111391250,0ptp4l0-21swapper/509:50:105
111391250,0ptp4l0-21swapper/509:37:445
111391250,0ptp4l0-21swapper/509:35:005
111391250,0ptp4l0-21swapper/509:05:205
111391250,0ptp4l0-21swapper/508:55:105
111391250,0ptp4l0-21swapper/411:04:364
111391250,0ptp4l0-21swapper/309:55:213
111391250,0ptp4l0-21swapper/110:26:491
111391250,0ptp4l0-21swapper/110:12:151
111391250,0ptp4l0-21swapper/110:12:141
111391250,0ptp4l0-21swapper/110:09:161
111391250,0ptp4l0-21swapper/109:37:291
111391250,0ptp4l0-21swapper/109:22:011
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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