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2025-11-05 - 10:27

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 Nov 05, 2025 00:46:11)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3166726745,7sleep70-21swapper/719:06:147
106842650,0sleep60-21swapper/621:37:346
114091640,29ptp4l0-21swapper/119:05:331
3196126151,6sleep60-21swapper/619:09:576
2120916049,6phc2sys0-21swapper/219:06:192
123532600,0sleep10-21swapper/121:40:181
114091600,29ptp4l0-21swapper/019:06:590
3179125836,7sleep30-21swapper/319:07:453
114091570,5ptp4l0-21swapper/419:08:564
114091550,5ptp4l0-21swapper/519:06:225
114091330,1ptp4l6196-21users21:30:235
114091330,0ptp4l0-21swapper/519:30:215
114091330,0ptp4l0-21swapper/423:45:144
114091330,0ptp4l0-21swapper/400:30:194
114091330,0ptp4l0-21swapper/400:30:194
114091330,0ptp4l0-21swapper/021:27:380
114091320,0ptp4l0-21swapper/121:50:151
114091320,0ptp4l0-21swapper/121:26:431
114091320,0ptp4l0-21swapper/120:44:591
114091310,0ptp4l0-21swapper/522:21:355
114091310,0ptp4l0-21swapper/122:44:221
114091310,0ptp4l0-21swapper/100:38:091
114091300,0ptp4l0-21swapper/421:18:084
114091300,0ptp4l0-21swapper/121:17:461
114091290,0ptp4l0-21swapper/523:19:355
114091290,0ptp4l0-21swapper/522:54:535
114091290,0ptp4l0-21swapper/522:25:185
114091290,0ptp4l0-21swapper/521:43:355
114091290,0ptp4l0-21swapper/520:20:205
114091290,0ptp4l0-21swapper/219:40:402
114091290,0ptp4l0-21swapper/100:18:051
114091290,0ptp4l0-21swapper/021:52:240
114091280,0ptp4l0-21swapper/522:45:155
114091280,0ptp4l0-21swapper/522:07:135
114091280,0ptp4l0-21swapper/321:57:583
114091280,0ptp4l0-21swapper/321:57:573
114091280,0ptp4l0-21swapper/223:38:212
114091280,0ptp4l0-21swapper/223:30:062
114091280,0ptp4l0-21swapper/222:35:132
114091280,0ptp4l0-21swapper/123:40:021
114091280,0ptp4l0-21swapper/122:20:151
114091280,0ptp4l0-21swapper/122:15:071
114091280,0ptp4l0-21swapper/121:13:271
114091280,0ptp4l0-21swapper/023:07:030
114091270,0ptp4l0-21swapper/722:36:157
114091270,0ptp4l0-21swapper/623:37:436
114091270,0ptp4l0-21swapper/621:27:096
114091270,0ptp4l0-21swapper/600:23:336
114091270,0ptp4l0-21swapper/523:38:315
114091270,0ptp4l0-21swapper/523:28:285
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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