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2026-08-20 - 06:57

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 here to display the system's profile data or here to proceed to next system.
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 Thu Aug 20, 2026 00:46:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
274572640,1sleep4471rcuc/421:45:184
126742630,0sleep50-21swapper/520:25:005
111391630,29ptp4l0-21swapper/119:05:481
111391610,6ptp4l0-21swapper/019:05:170
945026050,6sleep70-21swapper/719:05:347
111391600,5ptp4l0-21swapper/419:05:034
978625634,7sleep50-21swapper/519:09:495
1881915544,6phc2sys0-21swapper/219:05:032
944924737,6sleep60-21swapper/619:05:336
789124635,7sleep30-21swapper/319:05:063
111391350,0ptp4l0-21swapper/123:15:191
111391340,4ptp4l0-21swapper/523:51:125
111391320,7ptp4l0-21swapper/500:25:175
111391320,0ptp4l0-21swapper/521:40:195
111391320,0ptp4l0-21swapper/123:37:161
111391320,0ptp4l0-21swapper/123:02:091
111391320,0ptp4l0-21swapper/122:27:021
111391310,4ptp4l0-21swapper/121:20:271
111391310,0ptp4l0-21swapper/421:39:404
111391310,0ptp4l0-21swapper/000:10:160
111391300,0ptp4l0-21swapper/521:10:325
111391300,0ptp4l0-21swapper/122:15:551
111391300,0ptp4l0-21swapper/121:13:451
111391290,0ptp4l0-21swapper/123:42:411
111391290,0ptp4l0-21swapper/122:05:501
111391290,0ptp4l0-21swapper/121:37:511
111391290,0ptp4l0-21swapper/100:22:331
111391280,0ptp4l0-21swapper/522:35:505
111391280,0ptp4l0-21swapper/500:13:225
111391280,0ptp4l0-21swapper/422:21:164
111391280,0ptp4l0-21swapper/122:50:171
111391280,0ptp4l0-21swapper/122:50:161
111391280,0ptp4l0-21swapper/122:43:391
111391280,0ptp4l0-21swapper/121:46:471
111391280,0ptp4l0-21swapper/100:38:131
111391280,0ptp4l0-21swapper/022:09:310
111391270,0ptp4l0-21swapper/523:41:575
111391270,0ptp4l0-21swapper/523:07:075
111391270,0ptp4l0-21swapper/522:04:365
111391270,0ptp4l0-21swapper/521:49:415
111391270,0ptp4l0-21swapper/422:44:444
111391270,0ptp4l0-21swapper/422:07:084
111391270,0ptp4l0-21swapper/122:20:221
111391270,0ptp4l0-21swapper/122:03:211
111391260,0ptp4l0-21swapper/623:55:136
111391260,0ptp4l0-21swapper/623:02:556
111391260,0ptp4l0-21swapper/523:56:425
111391260,0ptp4l0-21swapper/522:21:495
111391260,0ptp4l0-21swapper/521:30:365
111391260,0ptp4l0-21swapper/521:18:285
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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