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2026-08-12 - 10:24

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 Wed Aug 12, 2026 00:46:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2803726948,6sleep20-21swapper/219:05:432
2803726948,6sleep20-21swapper/219:05:422
111391630,5ptp4l0-21swapper/619:05:116
111391630,5ptp4l0-21swapper/619:05:116
258442610,0sleep40-21swapper/422:49:314
111391580,5ptp4l0-21swapper/419:06:044
111391580,5ptp4l0-21swapper/419:06:034
111391580,27ptp4l0-21swapper/019:09:410
111391580,27ptp4l0-21swapper/019:09:400
1881915533,7phc2sys0-21swapper/519:07:005
1881915533,7phc2sys0-21swapper/519:06:595
34942500,0sleep40-21swapper/423:48:594
2831624937,7sleep70-21swapper/719:09:167
2831624937,7sleep70-21swapper/719:09:157
2823724837,6sleep10-21swapper/119:08:131
2823724837,6sleep10-21swapper/119:08:131
2808424736,7sleep30-21swapper/319:06:163
2808424736,7sleep30-21swapper/319:06:153
111391340,0ptp4l0-21swapper/423:56:154
111391340,0ptp4l0-21swapper/021:10:160
111391330,0ptp4l0-21swapper/420:10:204
111391320,0ptp4l0-21swapper/400:23:174
111391320,0ptp4l0-21swapper/400:23:164
111391310,0ptp4l0-21swapper/423:37:324
111391310,0ptp4l0-21swapper/423:05:164
111391310,0ptp4l0-21swapper/421:40:214
111391310,0ptp4l0-21swapper/421:40:204
111391310,0ptp4l0-21swapper/420:45:144
111391310,0ptp4l0-21swapper/400:30:134
111391310,0ptp4l0-21swapper/122:11:041
111391300,0ptp4l0-21swapper/419:20:194
111391300,0ptp4l0-21swapper/121:27:231
111391300,0ptp4l0-21swapper/120:35:191
111391300,0ptp4l0-21swapper/023:58:180
111391300,0ptp4l0-21swapper/023:11:210
111391290,3ptp4l0-21swapper/022:31:180
111391290,0ptp4l0-21swapper/423:15:194
111391290,0ptp4l0-21swapper/422:51:464
111391290,0ptp4l0-21swapper/421:56:354
111391290,0ptp4l0-21swapper/421:54:584
111391290,0ptp4l0-21swapper/123:09:591
111391290,0ptp4l0-21swapper/122:55:461
111391290,0ptp4l0-21swapper/022:48:230
111391290,0ptp4l0-21swapper/022:01:530
111391290,0ptp4l0-21swapper/000:25:110
111391280,0ptp4l17088-21ssh00:07:434
111391280,0ptp4l0-21swapper/422:40:204
111391280,0ptp4l0-21swapper/422:04:524
111391280,0ptp4l0-21swapper/419:28:544
111391280,0ptp4l0-21swapper/023:22:060
111391280,0ptp4l0-21swapper/022:56:070
111391280,0ptp4l0-21swapper/022:52:470
111391280,0ptp4l0-21swapper/021:15:220
111391270,0ptp4l0-21swapper/721:49:487
111391270,0ptp4l0-21swapper/521:13:315
111391270,0ptp4l0-21swapper/500:15:195
111391270,0ptp4l0-21swapper/423:22:474
111391270,0ptp4l0-21swapper/423:01:114
111391270,0ptp4l0-21swapper/421:26:484
111391270,0ptp4l0-21swapper/420:30:144
111391270,0ptp4l0-21swapper/419:10:014
111391270,0ptp4l0-21swapper/023:28:410
111391270,0ptp4l0-21swapper/023:05:170
111391270,0ptp4l0-21swapper/019:17:120
111391270,0ptp4l0-21swapper/019:10:160
111391270,0ptp4l0-21swapper/000:37:370
111391270,0ptp4l0-21swapper/000:05:450
111391260,4ptp4l12519-21ssh22:30:141
111391260,2ptp4l0-21swapper/421:32:234
111391260,2ptp4l0-21swapper/420:42:454
111391260,0ptp4l0-21swapper/720:20:017
111391260,0ptp4l0-21swapper/500:35:125
111391260,0ptp4l0-21swapper/423:32:204
111391260,0ptp4l0-21swapper/423:11:214
111391260,0ptp4l0-21swapper/421:22:074
111391260,0ptp4l0-21swapper/321:50:173
111391260,0ptp4l0-21swapper/321:49:233
111391260,0ptp4l0-21swapper/121:24:171
111391260,0ptp4l0-21swapper/100:17:021
111391260,0ptp4l0-21swapper/023:51:520
111391260,0ptp4l0-21swapper/023:35:580
111391260,0ptp4l0-21swapper/021:56:370
111391250,3ptp4l321ktimersoftd/222:32:512
111391250,2ptp4l0-21swapper/421:19:454
111391250,1ptp4l8181-21turbostat19:35:000
111391250,1ptp4l23414-21grep23:30:161
111391250,1ptp4l21309-21cat20:00:244
111391250,0ptp4l0-21swapper/723:06:367
111391250,0ptp4l0-21swapper/722:25:227
111391250,0ptp4l0-21swapper/721:50:107
111391250,0ptp4l0-21swapper/523:51:185
111391250,0ptp4l0-21swapper/521:35:215
111391250,0ptp4l0-21swapper/521:18:595
111391250,0ptp4l0-21swapper/520:35:195
111391250,0ptp4l0-21swapper/500:02:575
111391250,0ptp4l0-21swapper/423:50:174
111391250,0ptp4l0-21swapper/422:38:494
111391250,0ptp4l0-21swapper/422:12:204
111391250,0ptp4l0-21swapper/421:48:324
111391250,0ptp4l0-21swapper/121:58:571
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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