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2026-06-17 - 22:35

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 17, 2026 12:46:10)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
111391690,8ptp4l0-21swapper/007:05:250
147372620,0sleep20-21swapper/210:10:172
980626050,6sleep70-21swapper/707:06:097
279072590,0sleep60-21swapper/608:55:156
279072590,0sleep60-21swapper/608:55:156
126372590,1sleep233-21ksoftirqd/211:36:122
126372590,1sleep233-21ksoftirqd/211:36:122
111391590,5ptp4l0-21swapper/407:06:234
94652580,0sleep70-21swapper/712:15:517
25122570,0sleep70-21swapper/712:07:107
989125634,7sleep10-21swapper/107:07:151
9012550,0sleep10-21swapper/107:55:201
821425431,7sleep30-21swapper/307:05:163
1010725342,6sleep20-21swapper/207:09:552
1006724837,7sleep60-21swapper/607:09:286
976924634,7sleep50-21swapper/507:05:425
111391360,0ptp4l0-21swapper/112:30:091
111391310,7ptp4l0-21swapper/011:22:250
111391310,0ptp4l0-21swapper/412:15:194
111391310,0ptp4l0-21swapper/010:42:440
111391300,0ptp4l0-21swapper/409:55:104
111391300,0ptp4l0-21swapper/112:19:191
111391300,0ptp4l0-21swapper/012:34:160
111391300,0ptp4l0-21swapper/012:15:290
111391300,0ptp4l0-21swapper/012:04:550
111391300,0ptp4l0-21swapper/010:54:140
111391300,0ptp4l0-21swapper/010:35:200
111391300,0ptp4l0-21swapper/010:08:170
111391300,0ptp4l0-21swapper/009:52:570
111391290,0ptp4l0-21swapper/412:33:364
111391290,0ptp4l0-21swapper/412:00:394
111391290,0ptp4l0-21swapper/411:58:154
111391290,0ptp4l0-21swapper/411:52:114
111391290,0ptp4l0-21swapper/411:35:584
111391290,0ptp4l0-21swapper/411:35:584
111391290,0ptp4l0-21swapper/411:30:184
111391290,0ptp4l0-21swapper/411:30:184
111391290,0ptp4l0-21swapper/411:25:104
111391290,0ptp4l0-21swapper/407:36:154
111391290,0ptp4l0-21swapper/111:04:051
111391290,0ptp4l0-21swapper/108:35:111
111391290,0ptp4l0-21swapper/011:52:190
111391290,0ptp4l0-21swapper/011:32:560
111391290,0ptp4l0-21swapper/011:32:560
111391290,0ptp4l0-21swapper/011:05:360
111391290,0ptp4l0-21swapper/010:00:110
111391290,0ptp4l0-21swapper/009:44:320
111391280,0ptp4l0-21swapper/510:37:525
111391280,0ptp4l0-21swapper/411:12:494
111391280,0ptp4l0-21swapper/409:27:064
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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