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2026-09-11 - 10:11

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 Fri Sep 11, 2026 00:46:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
368926736,16sleep40-21swapper/419:07:254
111391670,30ptp4l0-21swapper/019:05:290
302712630,0sleep70-21swapper/700:20:147
292892610,0sleep60-21swapper/600:19:246
111391610,3ptp4l0-21swapper/519:05:115
111391610,30ptp4l0-21swapper/219:05:162
111391610,30ptp4l0-21swapper/119:09:051
355325444,6sleep70-21swapper/719:05:437
247525039,6sleep60-21swapper/619:05:176
362624736,7sleep30-21swapper/319:06:353
111391340,1ptp4l5470-21fw_forwarded_lo22:10:120
111391320,0ptp4l0-21swapper/022:03:550
111391320,0ptp4l0-21swapper/022:03:550
111391320,0ptp4l0-21swapper/021:36:430
111391320,0ptp4l0-21swapper/021:21:430
111391310,0ptp4l0-21swapper/421:16:574
111391310,0ptp4l0-21swapper/022:32:530
111391300,4ptp4l0-21swapper/023:50:370
111391300,0ptp4l27265-21diskmemload21:33:385
111391300,0ptp4l0-21swapper/521:12:185
111391300,0ptp4l0-21swapper/419:20:124
111391300,0ptp4l0-21swapper/419:20:114
111391300,0ptp4l0-21swapper/400:00:164
111391300,0ptp4l0-21swapper/300:13:303
111391300,0ptp4l0-21swapper/021:47:480
111391300,0ptp4l0-21swapper/020:55:190
111391290,2ptp4l0-21swapper/000:05:210
111391290,0ptp4l0-21swapper/422:57:084
111391290,0ptp4l0-21swapper/421:37:484
111391290,0ptp4l0-21swapper/023:36:270
111391290,0ptp4l0-21swapper/022:51:070
111391290,0ptp4l0-21swapper/022:29:340
111391290,0ptp4l0-21swapper/022:19:260
111391290,0ptp4l0-21swapper/000:23:370
111391280,0ptp4l0-21swapper/423:55:454
111391280,0ptp4l0-21swapper/423:33:104
111391280,0ptp4l0-21swapper/423:12:424
111391280,0ptp4l0-21swapper/421:10:234
111391280,0ptp4l0-21swapper/400:35:204
111391280,0ptp4l0-21swapper/400:35:194
111391280,0ptp4l0-21swapper/023:57:380
111391280,0ptp4l0-21swapper/023:45:190
111391280,0ptp4l0-21swapper/023:29:120
111391280,0ptp4l0-21swapper/022:39:570
111391280,0ptp4l0-21swapper/022:21:040
111391280,0ptp4l0-21swapper/022:05:250
111391280,0ptp4l0-21swapper/021:14:000
111391280,0ptp4l0-21swapper/021:00:110
111391280,0ptp4l0-21swapper/000:35:110
111391280,0ptp4l0-21swapper/000:35:110
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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