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2026-09-03 - 07:59

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 50 highest latencies:
System rackcslot8s.osadl.org (updated Thu Sep 03, 2026 00:46:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
260652660,2sleep02241399cyclictest21:26:070
111391660,30ptp4l0-21swapper/119:06:091
111391630,5ptp4l0-21swapper/019:07:430
111391620,28ptp4l0-21swapper/219:05:112
30512590,1sleep2321ktimersoftd/223:14:072
2193025645,7sleep70-21swapper/719:07:107
2209225534,6sleep50-21swapper/519:09:175
114252550,0sleep20-21swapper/200:12:062
111391550,5ptp4l0-21swapper/419:08:174
111391530,5ptp4l0-21swapper/619:07:006
2177224735,7sleep30-21swapper/319:05:223
241122430,0sleep70-21swapper/700:32:387
111391320,0ptp4l0-21swapper/522:00:185
111391320,0ptp4l0-21swapper/121:31:071
111391310,0ptp4l0-21swapper/123:25:131
111391300,0ptp4l0-21swapper/420:45:124
111391290,0ptp4l0-21swapper/523:05:155
111391290,0ptp4l0-21swapper/521:35:025
111391290,0ptp4l0-21swapper/423:57:164
111391290,0ptp4l0-21swapper/422:24:354
111391290,0ptp4l0-21swapper/421:37:074
111391290,0ptp4l0-21swapper/123:55:171
111391290,0ptp4l0-21swapper/121:53:501
111391290,0ptp4l0-21swapper/022:31:520
111391290,0ptp4l0-21swapper/022:17:460
111391290,0ptp4l0-21swapper/021:19:310
111391280,0ptp4l0-21swapper/522:43:285
111391280,0ptp4l0-21swapper/423:51:014
111391280,0ptp4l0-21swapper/423:31:494
111391280,0ptp4l0-21swapper/400:32:304
111391270,4ptp4l5296-21needreboot20:50:161
111391270,0ptp4l13184-21diskmemload00:02:340
111391270,0ptp4l0-21swapper/423:36:554
111391270,0ptp4l0-21swapper/423:36:544
111391270,0ptp4l0-21swapper/423:07:134
111391270,0ptp4l0-21swapper/423:04:434
111391270,0ptp4l0-21swapper/422:41:254
111391270,0ptp4l0-21swapper/422:38:054
111391270,0ptp4l0-21swapper/421:32:294
111391270,0ptp4l0-21swapper/421:22:294
111391270,0ptp4l0-21swapper/322:39:553
111391270,0ptp4l0-21swapper/123:10:371
111391270,0ptp4l0-21swapper/023:58:310
111391270,0ptp4l0-21swapper/023:50:550
111391270,0ptp4l0-21swapper/022:40:220
111391270,0ptp4l0-21swapper/022:35:130
111391270,0ptp4l0-21swapper/021:51:310
111391260,1ptp4l24764-21grep23:45:111
111391260,0ptp4l0-21swapper/619:25:136
111391260,0ptp4l0-21swapper/522:55:195
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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