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2026-07-30 - 05:47

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 Jul 29, 2026 12:46:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
110042900,0sleep20-21swapper/210:35:542
111391640,6ptp4l0-21swapper/007:09:080
111391620,31ptp4l0-21swapper/207:07:282
1904526151,6sleep70-21swapper/707:06:147
111391600,29ptp4l0-21swapper/107:05:051
111391560,5ptp4l0-21swapper/407:09:524
1919925533,7sleep30-21swapper/307:08:113
1898025432,7sleep60-21swapper/607:05:256
111391540,2ptp4l0-21swapper/507:05:135
156062520,0sleep20-21swapper/211:26:332
156062520,0sleep20-21swapper/211:26:332
111391380,0ptp4l0-21swapper/009:00:000
111391350,0ptp4l0-21swapper/410:15:164
111391340,1ptp4l1123-21ps12:35:170
111391330,0ptp4l0-21swapper/010:25:140
111391330,0ptp4l0-21swapper/009:10:210
111391320,0ptp4l0-21swapper/011:45:180
111391310,5ptp4l0-21swapper/511:57:385
111391310,0ptp4l0-21swapper/512:05:125
111391310,0ptp4l0-21swapper/510:00:175
111391310,0ptp4l0-21swapper/409:37:414
111391310,0ptp4l0-21swapper/011:29:390
111391310,0ptp4l0-21swapper/011:29:380
111391300,1ptp4l0-21swapper/512:01:215
111391300,0ptp4l0-21swapper/411:05:154
111391300,0ptp4l0-21swapper/110:10:121
111391300,0ptp4l0-21swapper/108:05:131
111391290,0ptp4l0-21swapper/111:26:361
111391290,0ptp4l0-21swapper/111:26:361
111391290,0ptp4l0-21swapper/011:57:590
111391290,0ptp4l0-21swapper/010:44:000
111391290,0ptp4l0-21swapper/008:20:000
111391280,4ptp4l0-21swapper/409:48:474
111391280,0ptp4l0-21swapper/511:15:345
111391280,0ptp4l0-21swapper/510:34:405
111391280,0ptp4l0-21swapper/509:43:455
111391280,0ptp4l0-21swapper/412:30:574
111391280,0ptp4l0-21swapper/412:22:484
111391280,0ptp4l0-21swapper/312:17:053
111391280,0ptp4l0-21swapper/309:13:583
111391280,0ptp4l0-21swapper/112:37:301
111391280,0ptp4l0-21swapper/011:04:470
111391280,0ptp4l0-21swapper/010:53:400
111391280,0ptp4l0-21swapper/010:09:330
111391270,4ptp4l0-21swapper/409:52:444
111391270,0ptp4l0-21swapper/508:35:125
111391270,0ptp4l0-21swapper/410:13:194
111391270,0ptp4l0-21swapper/407:46:344
111391270,0ptp4l0-21swapper/111:51:151
111391270,0ptp4l0-21swapper/111:21:221
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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