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2026-04-28 - 18:10

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 Tue Apr 28, 2026 00:46:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
111391760,7ptp4l0-21swapper/319:05:143
2783326048,7sleep10-21swapper/119:09:541
111391600,5ptp4l0-21swapper/719:08:057
22042590,0sleep30-21swapper/322:10:493
22042590,0sleep30-21swapper/322:10:483
87312580,2sleep32811799cyclictest00:30:123
1881915533,10phc2sys0-21swapper/019:07:160
2780525442,7sleep20-21swapper/219:09:312
2772725235,12sleep60-21swapper/619:08:306
2593325242,6sleep40-21swapper/419:05:094
2558324632,9sleep50-21swapper/519:05:015
111391380,0ptp4l0-21swapper/021:25:110
111391370,0ptp4l0-21swapper/421:40:314
111391350,0ptp4l0-21swapper/420:05:204
111391350,0ptp4l0-21swapper/022:38:590
111391340,8ptp4l0-21swapper/421:49:274
111391340,4ptp4l0-21swapper/423:09:554
111391340,0ptp4l0-21swapper/122:40:121
111391340,0ptp4l0-21swapper/021:24:090
111391330,0ptp4l0-21swapper/422:39:294
111391330,0ptp4l0-21swapper/422:23:394
111391330,0ptp4l0-21swapper/400:15:444
111391330,0ptp4l0-21swapper/022:28:000
111391330,0ptp4l0-21swapper/021:12:430
111391330,0ptp4l0-21swapper/000:14:430
111391320,1ptp4l19722-21smart_sda00:00:225
111391320,0ptp4l0-21swapper/422:52:464
111391320,0ptp4l0-21swapper/422:17:334
111391320,0ptp4l0-21swapper/422:01:494
111391320,0ptp4l0-21swapper/421:13:044
111391320,0ptp4l0-21swapper/400:37:514
111391320,0ptp4l0-21swapper/400:13:574
111391320,0ptp4l0-21swapper/323:06:073
111391320,0ptp4l0-21swapper/121:14:531
111391320,0ptp4l0-21swapper/100:11:371
111391320,0ptp4l0-21swapper/022:48:030
111391320,0ptp4l0-21swapper/022:44:250
111391320,0ptp4l0-21swapper/022:16:490
111391320,0ptp4l0-21swapper/021:58:090
111391310,1ptp4l0-21swapper/421:52:064
111391310,0ptp4l0-21swapper/423:44:004
111391310,0ptp4l0-21swapper/423:01:574
111391310,0ptp4l0-21swapper/422:59:354
111391310,0ptp4l0-21swapper/421:26:294
111391310,0ptp4l0-21swapper/400:24:504
111391310,0ptp4l0-21swapper/300:18:213
111391310,0ptp4l0-21swapper/023:59:450
111391310,0ptp4l0-21swapper/020:00:150
111391310,0ptp4l0-21swapper/019:45:220
111391300,5ptp4l0-21swapper/122:21:341
111391300,4ptp4l0-21swapper/423:12:144
111391300,2ptp4l0-21swapper/023:02:230
111391300,2ptp4l0-21swapper/020:25:150
111391300,2ptp4l0-21swapper/000:03:220
111391300,0ptp4l18873-21diskmemload22:34:371
111391300,0ptp4l0-21swapper/123:48:261
111391300,0ptp4l0-21swapper/023:31:150
111391300,0ptp4l0-21swapper/023:21:500
111391300,0ptp4l0-21swapper/020:30:130
111391300,0ptp4l0-21swapper/000:05:350
111391290,2ptp4l0-21swapper/421:16:384
111391290,0ptp4l0-21swapper/423:16:214
111391290,0ptp4l0-21swapper/400:27:214
111391290,0ptp4l0-21swapper/023:40:100
111391290,0ptp4l0-21swapper/021:05:210
111391290,0ptp4l0-21swapper/020:24:430
111391280,2ptp4l0-21swapper/023:53:060
111391280,0ptp4l0-21swapper/723:04:507
111391280,0ptp4l0-21swapper/422:13:244
111391280,0ptp4l0-21swapper/422:13:234
111391280,0ptp4l0-21swapper/421:55:314
111391280,0ptp4l0-21swapper/421:36:434
111391280,0ptp4l0-21swapper/419:45:144
111391280,0ptp4l0-21swapper/400:01:474
111391280,0ptp4l0-21swapper/323:25:493
111391280,0ptp4l0-21swapper/123:51:191
111391280,0ptp4l0-21swapper/022:56:070
111391280,0ptp4l0-21swapper/021:38:470
111391270,2ptp4l0-21swapper/123:28:261
111391270,0ptp4l18873-21diskmemload21:48:241
111391270,0ptp4l0-21swapper/723:25:137
111391270,0ptp4l0-21swapper/421:24:074
111391270,0ptp4l0-21swapper/419:41:414
111391270,0ptp4l0-21swapper/319:10:153
111391270,0ptp4l0-21swapper/123:42:361
111391270,0ptp4l0-21swapper/023:18:530
111391270,0ptp4l0-21swapper/023:14:420
111391270,0ptp4l0-21swapper/023:09:530
111391270,0ptp4l0-21swapper/022:12:560
111391270,0ptp4l0-21swapper/022:12:550
111391270,0ptp4l0-21swapper/021:52:360
111391270,0ptp4l0-21swapper/021:17:050
111391270,0ptp4l0-21swapper/019:30:170
111391270,0ptp4l0-21swapper/019:21:580
111391260,1ptp4l0-21swapper/422:30:194
111391260,0ptp4l0-21swapper/522:19:285
111391260,0ptp4l0-21swapper/419:16:574
111391260,0ptp4l0-21swapper/100:17:501
111391260,0ptp4l0-21swapper/019:55:130
111391250,2ptp4l0-21swapper/419:55:284
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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