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2025-11-26 - 11:35

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 Nov 26, 2025 00:46:11)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
114091670,29ptp4l0-21swapper/019:05:140
114091620,2ptp4l0-21swapper/419:05:164
114091610,5ptp4l0-21swapper/519:05:095
114091610,30ptp4l0-21swapper/119:09:141
1099625534,7sleep20-21swapper/219:05:552
1117825343,6sleep70-21swapper/719:08:177
1105225038,7sleep30-21swapper/319:06:363
1096924935,9sleep60-21swapper/619:05:356
114091360,0ptp4l0-21swapper/122:25:191
114091340,0ptp4l0-21swapper/520:19:285
114091340,0ptp4l0-21swapper/100:35:241
114091340,0ptp4l0-21swapper/100:35:231
114091330,0ptp4l0-21swapper/500:00:185
114091330,0ptp4l0-21swapper/121:35:551
114091320,0ptp4l0-21swapper/223:25:132
114091300,0ptp4l0-21swapper/219:11:252
114091300,0ptp4l0-21swapper/122:57:281
114091300,0ptp4l0-21swapper/122:12:371
114091300,0ptp4l0-21swapper/122:03:091
114091300,0ptp4l0-21swapper/121:05:161
114091300,0ptp4l0-21swapper/100:20:021
114091290,3ptp4l0-21swapper/522:19:125
114091290,1ptp4l14789-21ssh23:40:431
114091290,1ptp4l10843-21ssh00:22:472
114091290,0ptp4l0-21swapper/622:50:026
114091290,0ptp4l0-21swapper/522:32:395
114091290,0ptp4l0-21swapper/421:52:074
114091290,0ptp4l0-21swapper/123:50:441
114091290,0ptp4l0-21swapper/122:52:281
114091290,0ptp4l0-21swapper/121:11:521
114091290,0ptp4l0-21swapper/100:05:561
114091280,2ptp4l0-21swapper/521:49:505
114091280,0ptp4l0-21swapper/521:27:375
114091280,0ptp4l0-21swapper/222:23:012
114091280,0ptp4l0-21swapper/123:31:371
114091280,0ptp4l0-21swapper/121:21:511
114091280,0ptp4l0-21swapper/121:00:191
114091280,0ptp4l0-21swapper/100:29:171
114091280,0ptp4l0-21swapper/022:51:020
114091280,0ptp4l0-21swapper/021:36:450
114091270,3ptp4l0-21swapper/521:39:285
114091270,0ptp4l0-21swapper/522:29:375
114091270,0ptp4l0-21swapper/521:40:335
114091270,0ptp4l0-21swapper/500:20:075
114091270,0ptp4l0-21swapper/422:16:404
114091270,0ptp4l0-21swapper/221:32:202
114091270,0ptp4l0-21swapper/123:23:581
114091270,0ptp4l0-21swapper/122:34:471
114091270,0ptp4l0-21swapper/121:41:591
114091270,0ptp4l0-21swapper/121:30:261
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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