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2026-06-10 - 22:33

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 Wed Jun 10, 2026 12:46:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
111391660,27ptp4l0-21swapper/707:05:217
111391650,61ptp4l0-21swapper/307:07:383
144842630,0sleep00-21swapper/008:25:160
1881915747,6phc2sys0-21swapper/207:05:292
170882570,0sleep00-21swapper/011:40:210
54502550,0sleep20-21swapper/209:56:572
51962550,0sleep41068-21runrttasks09:56:104
1035625432,7sleep50-21swapper/507:07:365
279752520,0sleep70-21swapper/710:28:097
1054025141,6sleep40-21swapper/407:09:524
894925033,11sleep00-21swapper/007:05:150
111391490,0ptp4l12654-21ls08:20:204
1043824929,7sleep10-21swapper/107:08:361
1046924836,7sleep60-21swapper/607:08:586
111391320,0ptp4l0-21swapper/512:30:525
111391320,0ptp4l0-21swapper/412:35:494
111391310,0ptp4l0-21swapper/512:26:045
111391310,0ptp4l0-21swapper/011:39:280
111391310,0ptp4l0-21swapper/011:15:170
111391310,0ptp4l0-21swapper/010:55:100
111391310,0ptp4l0-21swapper/010:34:190
111391310,0ptp4l0-21swapper/009:28:370
111391300,5ptp4l24884-21sort12:35:200
111391300,0ptp4l0-21swapper/612:34:476
111391300,0ptp4l0-21swapper/609:29:286
111391300,0ptp4l0-21swapper/511:47:305
111391300,0ptp4l0-21swapper/509:55:315
111391300,0ptp4l0-21swapper/411:49:054
111391300,0ptp4l0-21swapper/411:38:174
111391300,0ptp4l0-21swapper/011:33:260
111391300,0ptp4l0-21swapper/011:24:190
111391300,0ptp4l0-21swapper/010:47:360
111391300,0ptp4l0-21swapper/009:16:310
111391290,0ptp4l0-21swapper/612:02:546
111391290,0ptp4l0-21swapper/612:02:536
111391290,0ptp4l0-21swapper/411:02:224
111391290,0ptp4l0-21swapper/409:25:324
111391290,0ptp4l0-21swapper/310:40:163
111391290,0ptp4l0-21swapper/009:49:430
111391290,0ptp4l0-21swapper/009:41:130
111391280,1ptp4l9-21ksoftirqd/012:02:410
111391280,1ptp4l9-21ksoftirqd/012:02:410
111391280,0ptp4l0-21swapper/710:41:087
111391280,0ptp4l0-21swapper/710:35:057
111391280,0ptp4l0-21swapper/611:28:276
111391280,0ptp4l0-21swapper/611:22:556
111391280,0ptp4l0-21swapper/412:28:164
111391280,0ptp4l0-21swapper/411:52:084
111391280,0ptp4l0-21swapper/411:43:384
111391280,0ptp4l0-21swapper/411:27:244
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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