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2026-03-25 - 09:03

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 Wed Mar 25, 2026 00:46:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
111391650,5ptp4l0-21swapper/619:05:536
111391630,5ptp4l0-21swapper/219:06:342
2494826039,6sleep70-21swapper/719:09:297
205562590,0sleep20-21swapper/223:30:202
2481425846,7sleep10-21swapper/119:07:471
2476725332,6sleep00-21swapper/019:07:140
2480025033,12sleep50-21swapper/519:07:345
2483524736,7sleep40-21swapper/419:08:064
2461824634,7sleep30-21swapper/319:05:253
111391350,0ptp4l0-21swapper/400:15:134
111391340,0ptp4l0-21swapper/419:10:184
111391310,0ptp4l0-21swapper/421:24:534
111391310,0ptp4l0-21swapper/000:15:210
111391300,5ptp4l0-21swapper/723:50:087
111391290,2ptp4l0-21swapper/423:27:274
111391290,0ptp4l0-21swapper/622:28:196
111391290,0ptp4l0-21swapper/522:07:145
111391290,0ptp4l0-21swapper/500:22:335
111391290,0ptp4l0-21swapper/421:28:474
111391290,0ptp4l0-21swapper/022:40:240
111391280,0ptp4l0-21swapper/622:23:006
111391280,0ptp4l0-21swapper/621:59:146
111391280,0ptp4l0-21swapper/423:50:554
111391280,0ptp4l0-21swapper/422:20:194
111391280,0ptp4l0-21swapper/421:59:074
111391280,0ptp4l0-21swapper/421:30:524
111391280,0ptp4l0-21swapper/421:30:514
111391280,0ptp4l0-21swapper/223:45:422
111391280,0ptp4l0-21swapper/223:27:512
111391280,0ptp4l0-21swapper/222:40:132
111391280,0ptp4l0-21swapper/023:12:310
111391280,0ptp4l0-21swapper/023:00:170
111391280,0ptp4l0-21swapper/020:20:140
111391270,0ptp4l0-21swapper/622:48:506
111391270,0ptp4l0-21swapper/523:25:195
111391270,0ptp4l0-21swapper/522:20:495
111391270,0ptp4l0-21swapper/221:52:392
111391270,0ptp4l0-21swapper/221:41:372
111391270,0ptp4l0-21swapper/200:38:312
111391270,0ptp4l0-21swapper/123:37:031
111391270,0ptp4l0-21swapper/122:20:511
111391270,0ptp4l0-21swapper/022:50:340
111391270,0ptp4l0-21swapper/021:35:460
111391270,0ptp4l0-21swapper/021:29:050
111391270,0ptp4l0-21swapper/020:05:150
111391260,1ptp4l481ktimersoftd/422:44:244
111391260,1ptp4l0-21swapper/721:55:147
111391260,0ptp4l0-21swapper/621:19:486
111391260,0ptp4l0-21swapper/522:29:585
111391260,0ptp4l0-21swapper/522:11:145
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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