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2025-12-31 - 05:20

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, slot #3

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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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 rack3slot3s.osadl.org (updated Wed Dec 31, 2025 00:43:55)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
758581215156,91sleep30-21swapper/319:06:443
75851829157,9sleep20-21swapper/219:05:592
75852228259,6sleep00-21swapper/019:06:010
75847827457,10sleep10-21swapper/119:05:301
758963993229,1cyclictest0-21swapper/322:15:003
75896399252,8cyclictest1062449-21turbostat23:54:593
758963992521,2cyclictest0-21swapper/322:35:193
9997492221,9sleep1999961-21cut22:55:171
758963992219,2cyclictest0-21swapper/300:15:273
758963992219,1cyclictest0-21swapper/322:15:153
758963992218,2cyclictest0-21swapper/300:05:003
9141432210,3sleep2421rcuc/221:35:012
758963992118,1cyclictest0-21swapper/323:15:273
75896399211,17cyclictest1051913-21turbostat23:45:003
758963992017,1cyclictest0-21swapper/323:35:153
758963992017,1cyclictest0-21swapper/320:40:153
758963992016,2cyclictest0-21swapper/300:10:003
75896399201,12cyclictest961939-21taskset22:20:113
75896399200,16cyclictest0-21swapper/323:13:453
75896399192,11cyclictest793260-21taskset19:40:153
758963991916,1cyclictest0-21swapper/323:45:233
758963991915,1cyclictest0-21swapper/320:40:013
75896399191,14cyclictest871144-21chrt20:50:203
75896399191,14cyclictest0-21swapper/322:25:123
75896399191,14cyclictest0-21swapper/300:30:173
9341282181,5sleep2934182-21ntpq21:50:212
75896399188,6cyclictest945519-21taskset22:04:243
758963991815,2cyclictest0-21swapper/322:40:183
758963991815,1cyclictest0-21swapper/323:25:003
758963991815,1cyclictest0-21swapper/323:00:003
758963991815,1cyclictest0-21swapper/320:15:243
758963991814,2cyclictest0-21swapper/323:00:123
75896399181,13cyclictest0-21swapper/321:25:223
75896399181,13cyclictest0-21swapper/320:00:123
75896399181,11cyclictest1079355-21taskset00:10:143
75896399181,10cyclictest995458-21taskset22:50:173
75896399181,10cyclictest798881-21taskset19:45:153
9819422171,2sleep00-21swapper/022:35:200
7935302171,10sleep1793742-21hddtemp_smartct19:40:171
758963991714,1cyclictest0-21swapper/321:55:013
758963991714,1cyclictest0-21swapper/321:35:263
758963991713,2cyclictest0-21swapper/321:30:183
758963991712,2cyclictest0-21swapper/319:35:013
75896399171,13cyclictest0-21swapper/300:24:403
75896399171,12cyclictest1099830-21turbostat00:30:003
75896399171,11cyclictest938295-21taskset21:55:183
75896399170,13cyclictest0-21swapper/321:20:203
75896399170,10cyclictest924880-21taskset21:45:123
11040582171,12sleep11104106-21modprobe00:30:241
9606642161,10sleep2960718-21ntpq22:15:222
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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