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2026-07-11 - 01:45

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 Jul 10, 2026 12:46:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1783721020,0sleep20-21swapper/207:30:132
111391670,28ptp4l0-21swapper/007:05:120
111391620,5ptp4l0-21swapper/207:05:042
77702590,0sleep30-21swapper/311:24:123
111391590,5ptp4l0-21swapper/407:09:284
61912560,0sleep00-21swapper/012:02:460
540825433,6sleep70-21swapper/707:05:057
1881915342,7phc2sys0-21swapper/107:07:341
1881914937,7phc2sys0-21swapper/507:05:015
701524737,6sleep60-21swapper/607:06:086
541324635,7sleep30-21swapper/307:05:093
111391310,0ptp4l0-21swapper/409:20:024
111391300,3ptp4l0-21swapper/410:27:574
111391300,0ptp4l15355-21ssh10:50:540
111391300,0ptp4l0-21swapper/412:10:114
111391300,0ptp4l0-21swapper/409:46:134
111391300,0ptp4l0-21swapper/011:45:180
111391300,0ptp4l0-21swapper/011:05:110
111391290,0ptp4l0-21swapper/412:18:094
111391290,0ptp4l0-21swapper/412:08:214
111391290,0ptp4l0-21swapper/410:20:244
111391290,0ptp4l0-21swapper/409:29:214
111391290,0ptp4l0-21swapper/111:49:351
111391290,0ptp4l0-21swapper/012:23:310
111391290,0ptp4l0-21swapper/012:14:280
111391290,0ptp4l0-21swapper/010:30:170
111391290,0ptp4l0-21swapper/010:02:340
111391290,0ptp4l0-21swapper/009:47:030
111391280,1ptp4l13891-21sed08:30:220
111391280,0ptp4l0-21swapper/411:54:574
111391280,0ptp4l0-21swapper/411:32:224
111391280,0ptp4l0-21swapper/410:57:244
111391280,0ptp4l0-21swapper/410:15:094
111391280,0ptp4l0-21swapper/410:02:014
111391280,0ptp4l0-21swapper/409:59:394
111391280,0ptp4l0-21swapper/409:16:174
111391280,0ptp4l0-21swapper/409:12:544
111391280,0ptp4l0-21swapper/111:09:061
111391280,0ptp4l0-21swapper/107:45:191
111391280,0ptp4l0-21swapper/011:25:400
111391280,0ptp4l0-21swapper/011:20:160
111391280,0ptp4l0-21swapper/010:36:260
111391280,0ptp4l0-21swapper/009:37:130
111391270,0ptp4l0-21swapper/612:08:356
111391270,0ptp4l0-21swapper/512:28:455
111391270,0ptp4l0-21swapper/412:00:344
111391270,0ptp4l0-21swapper/410:52:314
111391270,0ptp4l0-21swapper/408:50:184
111391270,0ptp4l0-21swapper/111:56:121
111391270,0ptp4l0-21swapper/111:38:281
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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