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2026-04-25 - 19:17

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 Apr 25, 2026 12:46:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
11792930,2sleep41500899cyclictest07:47:494
111391620,26ptp4l0-21swapper/307:05:163
1442526050,6sleep20-21swapper/207:06:152
1460325948,6sleep70-21swapper/707:08:367
1881915634,7phc2sys0-21swapper/507:05:485
111391540,3ptp4l481ktimersoftd/407:05:134
1881915039,7phc2sys0-21swapper/107:09:451
1467924837,6sleep00-21swapper/007:09:340
1280624635,7sleep60-21swapper/607:05:066
111391400,0ptp4l0-21swapper/411:53:254
111391330,0ptp4l0-21swapper/409:20:124
111391320,2ptp4l9406-21sh10:37:454
111391320,0ptp4l0-21swapper/412:12:064
111391310,4ptp4l8952-21fw_forwarded_lo08:05:144
111391310,0ptp4l0-21swapper/409:32:204
111391300,1ptp4l16714-21sh12:11:330
111391300,0ptp4l0-21swapper/412:38:524
111391300,0ptp4l0-21swapper/411:15:234
111391300,0ptp4l0-21swapper/111:31:461
111391300,0ptp4l0-21swapper/010:42:350
111391300,0ptp4l0-21swapper/009:30:300
111391290,0ptp4l0-21swapper/412:04:264
111391290,0ptp4l0-21swapper/412:04:264
111391290,0ptp4l0-21swapper/411:32:114
111391290,0ptp4l0-21swapper/410:53:584
111391290,0ptp4l0-21swapper/410:43:514
111391290,0ptp4l0-21swapper/410:18:284
111391290,0ptp4l0-21swapper/409:48:104
111391290,0ptp4l0-21swapper/409:25:074
111391290,0ptp4l0-21swapper/409:25:064
111391290,0ptp4l0-21swapper/110:49:001
111391290,0ptp4l0-21swapper/108:14:431
111391290,0ptp4l0-21swapper/012:36:120
111391290,0ptp4l0-21swapper/011:31:550
111391290,0ptp4l0-21swapper/011:01:050
111391290,0ptp4l0-21swapper/010:13:250
111391280,0ptp4l0-21swapper/411:56:514
111391280,0ptp4l0-21swapper/410:57:344
111391280,0ptp4l0-21swapper/409:37:234
111391280,0ptp4l0-21swapper/407:43:434
111391280,0ptp4l0-21swapper/309:28:223
111391280,0ptp4l0-21swapper/309:28:223
111391280,0ptp4l0-21swapper/010:25:160
111391280,0ptp4l0-21swapper/010:06:040
111391280,0ptp4l0-21swapper/010:01:450
111391280,0ptp4l0-21swapper/009:57:370
111391280,0ptp4l0-21swapper/009:53:100
111391280,0ptp4l0-21swapper/007:55:130
111391270,4ptp4l0-21swapper/011:20:400
111391270,0ptp4l0-21swapper/512:17:375
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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