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2025-11-29 - 13:27

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 Sat Nov 29, 2025 00:46:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
114091630,32ptp4l0-21swapper/319:07:053
114091630,32ptp4l0-21swapper/019:05:130
99472620,0sleep50-21swapper/520:55:155
114091590,5ptp4l0-21swapper/719:08:537
114091590,5ptp4l0-21swapper/419:05:404
2464425847,6sleep20-21swapper/219:05:552
260212570,0sleep10-21swapper/122:53:341
2463025431,7sleep50-21swapper/519:05:505
2482025242,6sleep60-21swapper/619:08:086
2496124838,6sleep10-21swapper/119:09:551
114091370,0ptp4l0-21swapper/519:10:155
114091350,1ptp4l1084-21snmpd22:50:134
114091350,0ptp4l0-21swapper/119:50:131
114091340,0ptp4l0-21swapper/523:42:035
114091340,0ptp4l0-21swapper/122:25:141
114091330,0ptp4l0-21swapper/123:52:291
114091320,1ptp4l6534-21irqrtprio21:40:155
114091320,1ptp4l28884-21/usr/sbin/munin22:10:221
114091320,0ptp4l0-21swapper/519:55:185
114091320,0ptp4l0-21swapper/421:20:164
114091320,0ptp4l0-21swapper/321:56:353
114091320,0ptp4l0-21swapper/221:29:552
114091310,2ptp4l401ktimersoftd/319:30:203
114091310,0ptp4l321ktimersoftd/223:20:192
114091310,0ptp4l0-21swapper/223:16:132
114091310,0ptp4l0-21swapper/221:33:252
114091310,0ptp4l0-21swapper/000:10:190
114091300,2ptp4l0-21swapper/523:19:365
114091300,0ptp4l0-21swapper/522:22:285
114091300,0ptp4l0-21swapper/322:09:143
114091300,0ptp4l0-21swapper/221:46:532
114091300,0ptp4l0-21swapper/200:35:352
114091300,0ptp4l0-21swapper/122:39:581
114091300,0ptp4l0-21swapper/120:05:121
114091290,3ptp4l401ktimersoftd/322:00:173
114091290,2ptp4l0-21swapper/323:48:223
114091290,1ptp4l0-21swapper/400:04:094
114091290,0ptp4l0-21swapper/722:49:077
114091290,0ptp4l0-21swapper/523:28:585
114091290,0ptp4l0-21swapper/523:28:585
114091290,0ptp4l0-21swapper/423:50:194
114091290,0ptp4l0-21swapper/422:30:424
114091290,0ptp4l0-21swapper/422:05:224
114091290,0ptp4l0-21swapper/121:51:171
114091290,0ptp4l0-21swapper/121:40:031
114091290,0ptp4l0-21swapper/121:20:141
114091290,0ptp4l0-21swapper/121:10:411
114091290,0ptp4l0-21swapper/021:54:450
114091290,0ptp4l0-21swapper/021:34:300
114091280,2ptp4l0-21swapper/521:28:585
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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