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2026-08-13 - 13:48

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, 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
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rackeslot3s.osadl.org (updated Thu Aug 13, 2026 00:45:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
233782997626,13cyclictest1-21systemd00:40:012
233782997626,13cyclictest1-21systemd00:40:012
233782997426,5cyclictest290236-21latency_hist22:55:022
233782996921,13cyclictest3467602-21systemd-journal21:57:322
233773996924,30cyclictest12-21ksoftirqd/023:58:360
233782996828,4cyclictest300936-21sh23:17:282
233787996724,37cyclictest302016-21sh23:19:513
233787996720,10cyclictest1-21systemd21:40:023
233782996737,26cyclictest1-21systemd21:35:002
233782996730,6cyclictest326039-21latency_hist00:10:032
233787996629,33cyclictest249817-21sh21:30:163
233787996521,40cyclictest270965-21latency_hist22:15:013
233773996521,10cyclictest131rcu_preempt00:21:270
233787996424,36cyclictest275-21dbus-daemon20:15:003
233782996424,8cyclictest270620-21sshd22:14:282
233782996322,10cyclictest30-21ksoftirqd/219:25:412
23378799622,18cyclictest321237-21systemd00:00:003
23377899622,8cyclictest23-21ksoftirqd/121:20:011
233787996127,30cyclictest1-21systemd23:30:013
233787996124,33cyclictest340515-21latency_hist00:40:023
233787996124,33cyclictest340515-21latency_hist00:40:013
233787996123,8cyclictest37-21ksoftirqd/321:23:413
233787996123,5cyclictest239947-21diskmemload22:49:233
233787996122,11cyclictest37-21ksoftirqd/322:56:363
233782996128,5cyclictest284453-21sh22:43:002
233782996128,5cyclictest284453-21sh22:43:002
233782996123,7cyclictest30-21ksoftirqd/223:55:042
23377399611,22cyclictest16850irq/134-800000022:40:010
233787996024,4cyclictest338048-21sh00:34:553
233787996021,4cyclictest275713-21latency_hist22:25:023
233787996021,4cyclictest275713-21latency_hist22:25:023
233787996020,5cyclictest239947-21diskmemload00:23:093
233787996018,6cyclictest37-21ksoftirqd/300:09:233
233782996023,9cyclictest239012-21sort20:50:022
23377399602,50cyclictest242445-21latency_hist21:15:020
233782995925,10cyclictest298519-21sshd23:12:292
233773995936,18cyclictest275-21dbus-daemon23:05:020
233773995926,15cyclictest305591-21ssh23:27:030
233787995826,28cyclictest281902-21sh22:37:463
233787995825,8cyclictest37-21ksoftirqd/322:41:243
233787995825,8cyclictest37-21ksoftirqd/322:41:243
233787995824,8cyclictest37-21ksoftirqd/323:32:293
233787995821,10cyclictest275-21dbus-daemon19:35:013
233782995826,6cyclictest238216-21latency_hist20:35:042
233773995829,13cyclictest251373-21ssh21:33:480
23378799572,16cyclictest237888-21unin-run20:30:013
23378799572,16cyclictest237888-21unin-run20:30:013
233787995718,5cyclictest235465-21latency_hist19:40:023
233787995713,10cyclictest266130-21systemd-run22:05:003
233787995712,10cyclictest303795-21sshd23:23:293
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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