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2026-09-17 - 13:40

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 17, 2026 00:46:11)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
111391690,35ptp4l0-21swapper/119:08:291
111391650,30ptp4l0-21swapper/019:05:390
111391640,2ptp4l0-21swapper/519:05:175
870826341,7sleep20-21swapper/219:06:412
32082590,0sleep30-21swapper/320:05:123
134222580,0sleep20-21swapper/222:15:192
58862570,0sleep30-21swapper/300:26:013
111391570,5ptp4l0-21swapper/419:08:184
676925644,7sleep70-21swapper/719:05:017
886424836,7sleep30-21swapper/319:08:423
706924534,6sleep60-21swapper/619:05:096
322942450,0sleep70-21swapper/722:42:557
111391410,0ptp4l0-21swapper/400:00:184
111391410,0ptp4l0-21swapper/400:00:184
111391380,0ptp4l0-21swapper/421:27:254
111391340,0ptp4l0-21swapper/423:55:154
111391340,0ptp4l0-21swapper/423:55:144
111391340,0ptp4l0-21swapper/419:35:164
111391330,0ptp4l0-21swapper/423:27:224
111391320,0ptp4l0-21swapper/423:08:354
111391320,0ptp4l0-21swapper/422:29:104
111391320,0ptp4l0-21swapper/420:45:134
111391310,0ptp4l0-21swapper/119:25:191
111391310,0ptp4l0-21swapper/023:05:220
111391310,0ptp4l0-21swapper/000:25:210
111391300,3ptp4l0-21swapper/121:10:511
111391300,0ptp4l0-21swapper/422:58:364
111391300,0ptp4l0-21swapper/422:16:554
111391300,0ptp4l0-21swapper/122:18:281
111391300,0ptp4l0-21swapper/100:26:161
111391290,0ptp4l0-21swapper/423:00:594
111391290,0ptp4l0-21swapper/421:47:314
111391290,0ptp4l0-21swapper/421:38:274
111391290,0ptp4l0-21swapper/421:17:164
111391290,0ptp4l0-21swapper/421:17:154
111391280,3ptp4l0-21swapper/400:10:564
111391280,0ptp4l0-21swapper/520:20:165
111391280,0ptp4l0-21swapper/423:50:544
111391280,0ptp4l0-21swapper/422:23:164
111391280,0ptp4l0-21swapper/422:14:084
111391280,0ptp4l0-21swapper/022:50:030
111391280,0ptp4l0-21swapper/022:17:200
111391280,0ptp4l0-21swapper/021:49:440
111391270,1ptp4l31699-21ssh22:41:040
111391270,1ptp4l16278-21sh21:31:521
111391270,0ptp4l0-21swapper/422:35:264
111391270,0ptp4l0-21swapper/422:32:184
111391270,0ptp4l0-21swapper/421:43:494
111391270,0ptp4l0-21swapper/123:45:411
111391270,0ptp4l0-21swapper/123:25:471
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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