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2026-03-24 - 12:49

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 Mar 24, 2026 00:46:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
111391710,29ptp4l0-21swapper/119:08:341
1881916352,6phc2sys0-21swapper/719:07:037
111391600,5ptp4l0-21swapper/419:07:554
111391600,5ptp4l0-21swapper/019:05:430
174522590,0sleep30-21swapper/323:50:183
209412540,0sleep70-21swapper/721:40:127
151062540,2sleep0768799cyclictest23:01:030
111391530,5ptp4l0-21swapper/519:08:365
616625037,7sleep20-21swapper/219:05:172
725424736,7sleep30-21swapper/319:07:503
723924635,6sleep60-21swapper/619:07:376
111391350,0ptp4l0-21swapper/421:20:184
111391310,0ptp4l0-21swapper/423:50:134
111391310,0ptp4l0-21swapper/420:35:184
111391310,0ptp4l0-21swapper/122:33:431
111391300,0ptp4l0-21swapper/400:00:164
111391300,0ptp4l0-21swapper/323:26:283
111391300,0ptp4l0-21swapper/323:26:273
111391300,0ptp4l0-21swapper/123:36:071
111391300,0ptp4l0-21swapper/000:38:260
111391300,0ptp4l0-21swapper/000:00:170
111391290,0ptp4l0-21swapper/423:02:374
111391290,0ptp4l0-21swapper/422:50:194
111391290,0ptp4l0-21swapper/400:30:194
111391290,0ptp4l0-21swapper/123:00:131
111391290,0ptp4l0-21swapper/022:43:080
111391290,0ptp4l0-21swapper/022:29:170
111391290,0ptp4l0-21swapper/021:57:400
111391290,0ptp4l0-21swapper/021:36:100
111391280,0ptp4l0-21swapper/423:19:314
111391280,0ptp4l0-21swapper/422:32:344
111391280,0ptp4l0-21swapper/422:27:184
111391280,0ptp4l0-21swapper/422:00:144
111391280,0ptp4l0-21swapper/400:39:134
111391280,0ptp4l0-21swapper/400:16:524
111391280,0ptp4l0-21swapper/123:25:001
111391280,0ptp4l0-21swapper/100:23:041
111391280,0ptp4l0-21swapper/023:47:460
111391280,0ptp4l0-21swapper/023:40:220
111391280,0ptp4l0-21swapper/023:20:050
111391280,0ptp4l0-21swapper/022:47:450
111391280,0ptp4l0-21swapper/022:34:110
111391280,0ptp4l0-21swapper/019:10:100
111391280,0ptp4l0-21swapper/000:25:200
111391270,1ptp4l0-21swapper/020:15:160
111391270,0ptp4l0-21swapper/722:06:027
111391270,0ptp4l0-21swapper/623:51:106
111391270,0ptp4l0-21swapper/623:13:106
111391270,0ptp4l0-21swapper/519:14:545
111391270,0ptp4l0-21swapper/423:32:214
111391270,0ptp4l0-21swapper/423:20:084
111391270,0ptp4l0-21swapper/423:12:404
111391270,0ptp4l0-21swapper/422:36:304
111391270,0ptp4l0-21swapper/422:20:564
111391270,0ptp4l0-21swapper/422:18:504
111391270,0ptp4l0-21swapper/422:05:104
111391270,0ptp4l0-21swapper/421:38:204
111391270,0ptp4l0-21swapper/121:52:551
111391270,0ptp4l0-21swapper/121:47:361
111391270,0ptp4l0-21swapper/023:26:030
111391270,0ptp4l0-21swapper/023:26:020
111391270,0ptp4l0-21swapper/023:12:420
111391270,0ptp4l0-21swapper/022:35:520
111391270,0ptp4l0-21swapper/021:41:120
111391270,0ptp4l0-21swapper/021:18:080
111391260,0ptp4l0-21swapper/723:27:087
111391260,0ptp4l0-21swapper/723:27:077
111391260,0ptp4l0-21swapper/422:45:044
111391260,0ptp4l0-21swapper/422:44:514
111391260,0ptp4l0-21swapper/421:46:144
111391260,0ptp4l0-21swapper/421:40:044
111391260,0ptp4l0-21swapper/421:11:544
111391260,0ptp4l0-21swapper/400:27:154
111391260,0ptp4l0-21swapper/400:20:584
111391260,0ptp4l0-21swapper/122:41:301
111391260,0ptp4l0-21swapper/119:45:001
111391260,0ptp4l0-21swapper/119:15:201
111391260,0ptp4l0-21swapper/021:51:220
111391260,0ptp4l0-21swapper/021:49:040
111391260,0ptp4l0-21swapper/020:00:220
111391260,0ptp4l0-21swapper/019:45:130
111391260,0ptp4l0-21swapper/000:09:130
111391250,0ptp4l0-21swapper/523:48:165
111391250,0ptp4l0-21swapper/523:35:175
111391250,0ptp4l0-21swapper/523:08:445
111391250,0ptp4l0-21swapper/521:50:195
111391250,0ptp4l0-21swapper/521:31:055
111391250,0ptp4l0-21swapper/521:15:185
111391250,0ptp4l0-21swapper/520:25:165
111391250,0ptp4l0-21swapper/421:35:014
111391250,0ptp4l0-21swapper/421:27:594
111391250,0ptp4l0-21swapper/421:17:524
111391250,0ptp4l0-21swapper/419:40:104
111391250,0ptp4l0-21swapper/400:14:304
111391250,0ptp4l0-21swapper/123:25:111
111391250,0ptp4l0-21swapper/123:25:101
111391250,0ptp4l0-21swapper/122:13:191
111391250,0ptp4l0-21swapper/121:55:111
111391250,0ptp4l0-21swapper/121:30:191
111391250,0ptp4l0-21swapper/121:25:131
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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