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2025-07-01 - 07:52

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 Tue Jul 01, 2025 00:46:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
114091630,4ptp4l32663-21ksmtuned19:06:495
3100526151,6sleep70-21swapper/719:05:097
114091600,29ptp4l0-21swapper/219:07:132
114091590,5ptp4l0-21swapper/619:08:436
235512580,1sleep5551rcuc/523:20:585
3268325736,6sleep30-21swapper/319:07:053
2120915634,6phc2sys0-21swapper/119:07:551
3259125332,7sleep40-21swapper/419:05:544
312422520,0sleep00-21swapper/022:47:370
43224635,6sleep00-21swapper/019:09:430
114091380,0ptp4l0-21swapper/619:15:016
114091330,0ptp4l0-21swapper/123:11:171
114091330,0ptp4l0-21swapper/123:11:161
114091320,3ptp4l0-21swapper/623:17:536
114091320,1ptp4l15412-21df20:50:116
114091300,0ptp4l0-21swapper/621:44:496
114091300,0ptp4l0-21swapper/600:24:236
114091300,0ptp4l0-21swapper/522:35:245
114091300,0ptp4l0-21swapper/123:35:351
114091300,0ptp4l0-21swapper/123:15:241
114091290,0ptp4l0-21swapper/619:44:516
114091290,0ptp4l0-21swapper/600:13:196
114091290,0ptp4l0-21swapper/421:30:184
114091290,0ptp4l0-21swapper/200:03:482
114091290,0ptp4l0-21swapper/122:25:221
114091290,0ptp4l0-21swapper/121:21:301
114091280,0ptp4l23953-21diskmemload21:28:451
114091280,0ptp4l0-21swapper/623:34:366
114091280,0ptp4l0-21swapper/622:37:446
114091280,0ptp4l0-21swapper/521:15:535
114091280,0ptp4l0-21swapper/223:31:332
114091280,0ptp4l0-21swapper/221:51:422
114091280,0ptp4l0-21swapper/122:23:581
114091280,0ptp4l0-21swapper/122:06:431
114091280,0ptp4l0-21swapper/023:22:100
114091280,0ptp4l0-21swapper/021:59:460
114091280,0ptp4l0-21swapper/000:07:450
114091270,1ptp4l23953-21diskmemload00:25:132
114091270,0ptp4l0-21swapper/500:03:385
114091270,0ptp4l0-21swapper/423:56:434
114091270,0ptp4l0-21swapper/423:08:054
114091270,0ptp4l0-21swapper/422:18:134
114091270,0ptp4l0-21swapper/222:44:152
114091270,0ptp4l0-21swapper/122:00:131
114091270,0ptp4l0-21swapper/022:13:090
114091260,0ptp4l0-21swapper/623:58:586
114091260,0ptp4l0-21swapper/600:37:356
114091260,0ptp4l0-21swapper/522:14:405
114091260,0ptp4l0-21swapper/423:39:564
114091260,0ptp4l0-21swapper/400:08:014
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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