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2026-07-16 - 04:50

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 Jul 16, 2026 00:46:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
111391640,5ptp4l0-21swapper/019:07:450
111391610,2ptp4l0-21swapper/119:05:201
715025948,7sleep20-21swapper/219:07:492
721725533,7sleep70-21swapper/719:08:437
146422550,0sleep40-21swapper/400:19:584
111391550,5ptp4l0-21swapper/419:08:154
111391510,5ptp4l0-21swapper/519:07:155
728924736,6sleep60-21swapper/619:09:386
715124736,7sleep30-21swapper/319:07:513
111391350,0ptp4l0-21swapper/422:40:134
111391340,0ptp4l0-21swapper/000:15:170
111391330,0ptp4l0-21swapper/423:55:164
111391330,0ptp4l0-21swapper/422:28:054
111391330,0ptp4l0-21swapper/400:37:274
111391330,0ptp4l0-21swapper/023:37:130
111391330,0ptp4l0-21swapper/023:37:120
111391330,0ptp4l0-21swapper/020:55:170
111391320,0ptp4l0-21swapper/722:42:277
111391320,0ptp4l0-21swapper/422:02:214
111391320,0ptp4l0-21swapper/420:00:204
111391310,0ptp4l0-21swapper/423:00:394
111391310,0ptp4l0-21swapper/421:16:294
111391310,0ptp4l0-21swapper/421:10:504
111391310,0ptp4l0-21swapper/022:48:090
111391310,0ptp4l0-21swapper/022:40:240
111391310,0ptp4l0-21swapper/021:40:200
111391300,0ptp4l0-21swapper/423:23:114
111391300,0ptp4l0-21swapper/422:45:154
111391300,0ptp4l0-21swapper/422:24:144
111391300,0ptp4l0-21swapper/421:47:344
111391300,0ptp4l0-21swapper/421:29:084
111391300,0ptp4l0-21swapper/400:25:134
111391300,0ptp4l0-21swapper/400:14:124
111391300,0ptp4l0-21swapper/400:08:024
111391300,0ptp4l0-21swapper/321:58:243
111391300,0ptp4l0-21swapper/023:51:400
111391300,0ptp4l0-21swapper/023:49:110
111391300,0ptp4l0-21swapper/023:30:530
111391300,0ptp4l0-21swapper/023:30:530
111391300,0ptp4l0-21swapper/022:53:100
111391300,0ptp4l0-21swapper/022:35:110
111391300,0ptp4l0-21swapper/021:15:500
111391300,0ptp4l0-21swapper/000:30:480
111391290,0ptp4l0-21swapper/423:38:104
111391290,0ptp4l0-21swapper/423:38:104
111391290,0ptp4l0-21swapper/423:15:024
111391290,0ptp4l0-21swapper/423:08:374
111391290,0ptp4l0-21swapper/422:59:184
111391290,0ptp4l0-21swapper/422:33:344
111391290,0ptp4l0-21swapper/022:34:160
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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