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2026-05-06 - 20:21

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 Wed May 06, 2026 12:46:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
111391670,29ptp4l0-21swapper/007:05:560
111391660,5ptp4l0-21swapper/407:06:404
111391640,31ptp4l0-21swapper/107:09:361
987426150,6sleep70-21swapper/707:07:147
159892580,0sleep70-21swapper/707:20:117
1009725848,6sleep20-21swapper/207:09:582
161512570,1sleep21068-21runrttasks12:22:052
278412550,0sleep40-21swapper/410:27:194
278412550,0sleep40-21swapper/410:27:194
1001425433,6sleep60-21swapper/607:08:586
982324736,7sleep30-21swapper/307:06:303
976124535,6sleep50-21swapper/507:05:445
111391330,0ptp4l0-21swapper/512:30:365
111391310,0ptp4l0-21swapper/509:37:245
111391310,0ptp4l0-21swapper/409:28:494
111391310,0ptp4l0-21swapper/408:50:174
111391310,0ptp4l0-21swapper/408:10:104
111391300,3ptp4l241ktimersoftd/112:25:141
111391300,0ptp4l0-21swapper/610:56:076
111391300,0ptp4l0-21swapper/412:36:354
111391300,0ptp4l0-21swapper/412:30:194
111391300,0ptp4l0-21swapper/412:12:464
111391300,0ptp4l0-21swapper/412:03:344
111391300,0ptp4l0-21swapper/411:39:454
111391300,0ptp4l0-21swapper/411:05:194
111391300,0ptp4l0-21swapper/111:21:071
111391300,0ptp4l0-21swapper/109:44:401
111391290,0ptp4l0-21swapper/510:54:085
111391290,0ptp4l0-21swapper/510:08:205
111391290,0ptp4l0-21swapper/410:06:554
111391290,0ptp4l0-21swapper/409:30:324
111391290,0ptp4l0-21swapper/310:15:173
111391290,0ptp4l0-21swapper/112:19:101
111391290,0ptp4l0-21swapper/112:06:221
111391290,0ptp4l0-21swapper/110:32:531
111391280,2ptp4l0-21swapper/111:44:271
111391280,0ptp4l0-21swapper/410:50:134
111391280,0ptp4l0-21swapper/111:16:121
111391280,0ptp4l0-21swapper/012:20:490
111391280,0ptp4l0-21swapper/009:29:130
111391270,0ptp4l1086-21diskmemload10:12:454
111391270,0ptp4l0-21swapper/412:27:344
111391270,0ptp4l0-21swapper/410:37:324
111391270,0ptp4l0-21swapper/410:34:234
111391270,0ptp4l0-21swapper/410:24:434
111391270,0ptp4l0-21swapper/410:24:434
111391270,0ptp4l0-21swapper/410:02:024
111391270,0ptp4l0-21swapper/409:39:124
111391270,0ptp4l0-21swapper/409:10:184
111391270,0ptp4l0-21swapper/112:11:511
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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