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2025-12-04 - 18:31

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 Dec 04, 2025 12:46:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2110326736,7sleep70-21swapper/707:09:237
242482640,0sleep10-21swapper/110:50:151
114091640,33ptp4l0-21swapper/107:05:311
114091620,6ptp4l0-21swapper/607:08:596
225782610,0sleep70-21swapper/710:48:227
114091600,29ptp4l0-21swapper/207:07:512
114091580,6ptp4l0-21swapper/407:05:114
114091580,5ptp4l0-21swapper/507:07:275
2107225545,6sleep30-21swapper/307:08:553
114091540,13ptp4l0-21swapper/007:05:190
114091530,0ptp4l105-21kswapd011:43:070
114091380,2ptp4l4623-21latency11:50:154
114091360,0ptp4l0-21swapper/412:18:514
114091360,0ptp4l0-21swapper/409:31:544
114091330,1ptp4l5718-21ssh09:42:251
114091320,3ptp4l481ktimersoftd/412:10:134
114091320,0ptp4l0-21swapper/112:08:311
114091320,0ptp4l0-21swapper/111:35:191
114091320,0ptp4l0-21swapper/111:25:121
114091310,0ptp4l0-21swapper/410:41:474
114091310,0ptp4l0-21swapper/410:28:304
114091310,0ptp4l0-21swapper/410:12:564
114091310,0ptp4l0-21swapper/209:41:362
114091310,0ptp4l0-21swapper/109:17:371
114091310,0ptp4l0-21swapper/109:10:351
114091300,0ptp4l0-21swapper/409:49:034
114091300,0ptp4l0-21swapper/409:20:344
114091300,0ptp4l0-21swapper/009:52:290
114091300,0ptp4l0-21swapper/009:12:060
114091290,0ptp4l0-21swapper/412:30:534
114091290,0ptp4l0-21swapper/412:27:554
114091290,0ptp4l0-21swapper/312:17:023
114091290,0ptp4l0-21swapper/310:14:183
114091290,0ptp4l0-21swapper/308:46:273
114091290,0ptp4l0-21swapper/112:34:411
114091290,0ptp4l0-21swapper/009:28:080
114091280,0ptp4l0-21swapper/710:29:267
114091280,0ptp4l0-21swapper/510:45:145
114091280,0ptp4l0-21swapper/411:44:404
114091280,0ptp4l0-21swapper/411:10:494
114091280,0ptp4l0-21swapper/411:10:484
114091280,0ptp4l0-21swapper/410:19:244
114091280,0ptp4l0-21swapper/410:07:354
114091280,0ptp4l0-21swapper/210:21:402
114091280,0ptp4l0-21swapper/209:38:492
114091280,0ptp4l0-21swapper/112:25:581
114091280,0ptp4l0-21swapper/110:56:111
114091280,0ptp4l0-21swapper/010:50:200
114091270,0ptp4l0-21swapper/512:00:375
114091270,0ptp4l0-21swapper/411:29:264
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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