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2025-11-19 - 12:01

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 19, 2025 00:46:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
114091680,29ptp4l0-21swapper/519:05:215
114091630,28ptp4l0-21swapper/119:09:441
159802610,0sleep10-21swapper/121:20:211
114091610,30ptp4l0-21swapper/019:08:040
114091600,5ptp4l0-21swapper/419:09:224
1533625948,6sleep20-21swapper/219:09:352
1529125746,6sleep30-21swapper/319:09:043
1521225240,7sleep60-21swapper/619:08:036
1501425241,7sleep70-21swapper/719:05:337
114091350,0ptp4l0-21swapper/623:20:146
114091350,0ptp4l0-21swapper/022:36:420
114091340,0ptp4l0-21swapper/622:50:176
114091330,0ptp4l0-21swapper/100:18:211
114091320,4ptp4l0-21swapper/521:39:565
114091320,0ptp4l0-21swapper/521:23:565
114091320,0ptp4l0-21swapper/123:55:171
114091310,0ptp4l0-21swapper/523:35:215
114091310,0ptp4l0-21swapper/522:31:405
114091310,0ptp4l0-21swapper/521:10:335
114091300,0ptp4l0-21swapper/623:17:156
114091300,0ptp4l0-21swapper/623:10:246
114091300,0ptp4l0-21swapper/523:43:555
114091300,0ptp4l0-21swapper/223:20:142
114091300,0ptp4l0-21swapper/100:05:141
114091300,0ptp4l0-21swapper/022:02:340
114091300,0ptp4l0-21swapper/019:10:130
114091300,0ptp4l0-21swapper/019:10:130
114091290,1ptp4l6511-21diskmemload23:20:005
114091290,0ptp4l0-21swapper/521:43:475
114091290,0ptp4l0-21swapper/500:28:225
114091290,0ptp4l0-21swapper/423:30:524
114091290,0ptp4l0-21swapper/422:46:164
114091290,0ptp4l0-21swapper/400:32:514
114091290,0ptp4l0-21swapper/400:18:174
114091290,0ptp4l0-21swapper/323:14:463
114091290,0ptp4l0-21swapper/022:47:230
114091290,0ptp4l0-21swapper/021:35:150
114091280,0ptp4l6511-21diskmemload22:18:202
114091280,0ptp4l0-21swapper/723:26:597
114091280,0ptp4l0-21swapper/522:21:005
114091280,0ptp4l0-21swapper/400:28:494
114091280,0ptp4l0-21swapper/221:35:552
15662992724,0cyclictest0-21swapper/520:35:415
114091270,2ptp4l0-21swapper/323:40:163
114091270,0ptp4l0-21swapper/621:15:386
114091270,0ptp4l0-21swapper/522:10:465
114091270,0ptp4l0-21swapper/421:57:064
114091270,0ptp4l0-21swapper/223:29:542
114091270,0ptp4l0-21swapper/223:16:482
114091270,0ptp4l0-21swapper/122:50:451
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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