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2025-12-07 - 18:52

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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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 Sun Dec 07, 2025 12:46:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
886526443,6sleep60-21swapper/607:06:416
882826241,6sleep70-21swapper/707:06:117
304342620,0sleep70-21swapper/710:30:187
114091610,5ptp4l0-21swapper/207:05:182
114091610,30ptp4l0-21swapper/107:07:581
82162590,1sleep4471rcuc/407:05:194
114091590,5ptp4l0-21swapper/507:09:005
722525838,6sleep30-21swapper/307:05:093
48462560,0sleep60-21swapper/609:15:116
262852560,0sleep60-21swapper/610:25:216
877725332,6sleep00-21swapper/007:05:320
114091370,0ptp4l0-21swapper/611:40:116
114091360,0ptp4l0-21swapper/112:30:011
114091350,0ptp4l0-21swapper/609:00:186
114091320,0ptp4l0-21swapper/712:16:557
114091320,0ptp4l0-21swapper/609:34:116
114091320,0ptp4l0-21swapper/112:14:561
114091310,2ptp4l0-21swapper/007:40:110
114091310,0ptp4l0-21swapper/111:26:151
114091310,0ptp4l0-21swapper/110:48:561
114091310,0ptp4l0-21swapper/007:15:130
114091300,0ptp4l0-21swapper/611:53:116
114091300,0ptp4l0-21swapper/611:23:396
114091300,0ptp4l0-21swapper/508:00:115
114091300,0ptp4l0-21swapper/410:53:354
114091300,0ptp4l0-21swapper/112:21:491
114091300,0ptp4l0-21swapper/110:52:041
114091300,0ptp4l0-21swapper/110:39:151
114091290,3ptp4l0-21swapper/411:28:124
114091290,3ptp4l0-21swapper/010:37:560
114091290,0ptp4l0-21swapper/609:49:266
114091290,0ptp4l0-21swapper/411:45:334
114091290,0ptp4l0-21swapper/110:15:351
114091290,0ptp4l0-21swapper/109:24:161
114091290,0ptp4l0-21swapper/109:24:151
114091290,0ptp4l0-21swapper/011:45:200
114091280,2ptp4l0-21swapper/509:44:265
114091280,0ptp4l32609-21diskmemload09:52:291
114091280,0ptp4l0-21swapper/709:39:127
114091280,0ptp4l0-21swapper/109:56:571
114091280,0ptp4l0-21swapper/109:42:261
114091270,2ptp4l0-21swapper/610:18:396
114091270,2ptp4l0-21swapper/010:43:500
114091270,1ptp4l32609-21diskmemload10:15:185
114091270,0ptp4l14853-21ssh09:28:171
114091270,0ptp4l0-21swapper/610:20:356
114091270,0ptp4l0-21swapper/609:50:446
114091270,0ptp4l0-21swapper/411:59:144
114091270,0ptp4l0-21swapper/411:59:144
114091270,0ptp4l0-21swapper/211:17:542
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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