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2026-03-10 - 22:39

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 Tue Mar 10, 2026 12:46:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
257822680,0sleep10-21swapper/111:50:001
111391680,2ptp4l0-21swapper/107:07:411
111391610,5ptp4l0-21swapper/507:07:085
1539125949,6sleep70-21swapper/707:06:427
111391590,28ptp4l0-21swapper/007:09:580
76072580,0sleep40-21swapper/408:00:134
263442580,0sleep20-21swapper/210:20:132
289562570,0sleep30-21swapper/309:40:003
1559125533,7sleep30-21swapper/307:09:183
1556325342,7sleep20-21swapper/207:08:542
1373724938,6sleep40-21swapper/407:05:044
1373924837,6sleep60-21swapper/607:05:066
111391320,0ptp4l0-21swapper/508:25:205
111391320,0ptp4l0-21swapper/011:15:190
111391310,0ptp4l0-21swapper/409:54:234
111391310,0ptp4l0-21swapper/010:52:180
111391310,0ptp4l0-21swapper/010:15:150
111391300,0ptp4l0-21swapper/512:17:405
111391300,0ptp4l0-21swapper/409:22:174
111391300,0ptp4l0-21swapper/111:00:171
111391300,0ptp4l0-21swapper/108:55:141
111391300,0ptp4l0-21swapper/012:03:580
111391300,0ptp4l0-21swapper/009:05:140
111391290,3ptp4l0-21swapper/112:19:361
111391290,3ptp4l0-21swapper/110:29:161
111391290,0ptp4l0-21swapper/411:52:334
111391290,0ptp4l0-21swapper/411:42:454
111391290,0ptp4l0-21swapper/410:33:244
111391290,0ptp4l0-21swapper/410:01:344
111391290,0ptp4l0-21swapper/112:04:521
111391290,0ptp4l0-21swapper/110:46:261
111391290,0ptp4l0-21swapper/011:38:130
111391280,4ptp4l23213-21latency_hist07:25:014
111391280,0ptp4l0-21swapper/511:55:115
111391280,0ptp4l0-21swapper/510:23:425
111391280,0ptp4l0-21swapper/411:21:294
111391280,0ptp4l0-21swapper/409:16:594
111391280,0ptp4l0-21swapper/110:44:371
111391280,0ptp4l0-21swapper/011:56:370
111391280,0ptp4l0-21swapper/011:25:120
111391280,0ptp4l0-21swapper/009:25:430
111391280,0ptp4l0-21swapper/009:23:320
111391270,1ptp4l22944-21/usr/sbin/munin09:30:171
111391270,0ptp4l0-21swapper/712:08:197
111391270,0ptp4l0-21swapper/512:03:265
111391270,0ptp4l0-21swapper/507:15:215
111391270,0ptp4l0-21swapper/412:39:094
111391270,0ptp4l0-21swapper/412:01:054
111391270,0ptp4l0-21swapper/410:57:154
111391270,0ptp4l0-21swapper/410:48:444
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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