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2026-03-12 - 10:36

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, 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 rack0slot8s.osadl.org (updated Thu Mar 12, 2026 00:44:42)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2834911000,85ptp4l0-21swapper/119:05:181
81482900,0sleep40-21swapper/422:32:306
94080740,69rtkit-daemon0-21swapper/019:08:470
1129727262,8sleep100-21swapper/1019:08:522
1124026957,10sleep70-21swapper/719:08:019
1109626855,11sleep110-21swapper/1119:05:523
1033626857,8sleep40-21swapper/419:05:206
1127926756,9sleep50-21swapper/519:08:347
1126726453,9sleep60-21swapper/619:08:238
254822530,2sleep011-21ksoftirqd/020:05:230
49582480,0sleep00-21swapper/000:35:140
1151899232,16cyclictest0-21swapper/420:05:006
1151899212,15cyclictest0-21swapper/423:20:006
11525992012,8cyclictest0-21swapper/1000:00:202
1151899202,14cyclictest0-21swapper/421:55:016
1152399183,8cyclictest0-21swapper/920:20:0011
1152399182,9cyclictest0-21swapper/923:19:5911
1151899181,13cyclictest0-21swapper/422:10:006
283491170,0ptp4l0-21swapper/119:15:021
1151599170,16cyclictest0-21swapper/121:35:111
283491160,0ptp4l0-21swapper/120:25:121
1152399163,8cyclictest0-21swapper/900:25:0011
1152299161,14cyclictest0-21swapper/821:30:1710
1151999165,8cyclictest27686-21kworker/u24:120:15:017
1151799163,8cyclictest0-21swapper/322:15:005
1151799162,8cyclictest0-21swapper/323:59:595
1151799162,8cyclictest0-21swapper/323:20:005
1151799162,8cyclictest0-21swapper/321:30:015
1151799161,3cyclictest0-21swapper/319:10:155
1151799160,10cyclictest0-21swapper/323:30:005
1151599164,7cyclictest0-21swapper/122:04:591
1151599163,8cyclictest0-21swapper/122:25:001
111472167,7sleep80-21swapper/819:06:3710
283491150,1ptp4l21-21ksoftirqd/120:45:111
283491150,1ptp4l21-21ksoftirqd/119:10:221
283491150,0ptp4l0-21swapper/120:40:181
121912150,0sleep70-21swapper/723:20:139
1152399153,7cyclictest0-21swapper/922:45:0011
1152399152,8cyclictest0-21swapper/920:05:0111
1151999152,8cyclictest0-21swapper/523:25:227
1151799153,7cyclictest0-21swapper/320:25:015
1151799151,8cyclictest0-21swapper/321:55:005
1151599152,8cyclictest0-21swapper/123:00:001
1151599152,8cyclictest0-21swapper/122:45:001
283491140,1ptp4l21-21ksoftirqd/123:10:151
283491140,1ptp4l21-21ksoftirqd/122:16:021
283491140,0ptp4l0-21swapper/121:45:201
283491140,0ptp4l0-21swapper/119:28:181
1152599140,9cyclictest0-21swapper/1022:15:002
1152399143,7cyclictest0-21swapper/923:25:0011
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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