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2026-04-16 - 07:48

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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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
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rackeslot3s.osadl.org (updated Thu Apr 16, 2026 00:45:25)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
4124425991024,66cyclictest4110639-21munin-node20:40:023
4124414998856,23cyclictest4160275-21kworker/u8:422:45:020
4124414998314,63cyclictest16850irq/134-800000022:29:440
4124414998216,61cyclictest16850irq/134-800000021:56:430
4124423997830,43cyclictest275-21dbus-daemon00:05:012
4124414997817,51cyclictest16850irq/134-800000023:33:240
4124414997722,51cyclictest4192648-21ssh23:37:430
4124414997722,51cyclictest4192648-21ssh23:37:430
4124414997714,51cyclictest16850irq/134-800000023:27:560
4124414997714,51cyclictest16850irq/134-800000023:27:560
412441499768,63cyclictest16850irq/134-800000023:17:310
412441499768,63cyclictest16850irq/134-800000023:17:310
412441499763,9cyclictest1-21systemd21:45:010
4124414997627,30cyclictest4180062-21ssh23:07:550
4124414997627,30cyclictest4180062-21ssh23:07:550
4124414997615,51cyclictest16850irq/134-800000022:50:020
4124414997615,51cyclictest16850irq/134-800000022:50:020
4124414997615,38cyclictest16850irq/134-800000021:46:240
4124414997515,5cyclictest19350irq/34-mmc120:00:020
4124414997514,52cyclictest16850irq/134-800000000:29:150
4124414997424,34cyclictest4167416-21ssh22:37:440
4124418997335,10cyclictest275-21dbus-daemon00:30:001
4124414997329,39cyclictest4160927-21ssh22:22:040
4124414997326,43cyclictest4186739-21ssh23:23:370
4124414997319,15cyclictest5373-21ssh23:53:420
412441499728,6cyclictest16850irq/134-800000023:01:450
412441499726,6cyclictest16850irq/134-800000023:59:330
4124414997235,33cyclictest16850irq/134-800000021:15:010
4124414997228,27cyclictest4153781-21ssh22:05:020
4124414997212,43cyclictest16850irq/134-800000000:05:080
4124418997122,17cyclictest275-21dbus-daemon21:55:011
4124414997122,30cyclictest9372-21ssh00:03:120
412441499711,5cyclictest4140995-21munin-run21:35:020
4124425997062,6cyclictest37-21ksoftirqd/300:10:033
4124425997062,6cyclictest37-21ksoftirqd/300:10:023
4124423996923,41cyclictest4155766-21latency_hist22:10:012
412441499696,5cyclictest16850irq/134-800000023:10:220
4124414996910,6cyclictest16850irq/134-800000021:23:340
412442599681,36cyclictest4192714-21ssh23:37:513
412442599681,36cyclictest4192714-21ssh23:37:513
412441899685,23cyclictest1-21systemd21:00:011
412441899685,21cyclictest4147374-21grep21:50:011
412441499688,5cyclictest16850irq/134-800000022:30:260
412441499682,15cyclictest48-21kcompactd022:08:380
4124414996821,41cyclictest275-21dbus-daemon00:20:010
4124414996810,6cyclictest16850irq/134-800000023:46:030
412442599672,59cyclictest4132871-21sshd21:15:123
4124423996726,36cyclictest4181428-21sh23:10:542
4124423996722,7cyclictest309-21in:imuxsock21:35:002
412441899676,21cyclictest7930-21latency_hist00:00:021
412441899676,19cyclictest284-21systemd-logind19:30:011
412441499679,48cyclictest16850irq/134-800000021:36:350
412441499676,6cyclictest16850irq/134-800000000:12:310
412441499676,6cyclictest16850irq/134-800000000:12:300
4124414996729,33cyclictest4132832-21ssh21:15:080
4124414996721,40cyclictest4176631-21munin-plugin-st23:00:000
4124414996712,50cyclictest16850irq/134-800000021:27:570
412442599662,59cyclictest4152506-21ssh22:02:003
412442599661,61cyclictest4165315-21ssh22:32:383
412442599661,61cyclictest4156064-21ssh22:10:223
412442599661,61cyclictest4148247-21ssh21:51:533
412441899665,19cyclictest4185226-21latency_hist23:20:011
412441899665,19cyclictest4185226-21latency_hist23:20:011
4124414996612,44cyclictest16850irq/134-800000023:44:450
412441499661,15cyclictest4126404-21sshd19:47:130
4124425996518,43cyclictest37-21ksoftirqd/323:05:063
4124425996518,43cyclictest37-21ksoftirqd/323:05:053
412442599651,60cyclictest4153870-21ssh22:05:063
412442599651,60cyclictest4141680-21ssh21:36:123
412442599651,60cyclictest22556-21ssh00:34:463
412442399653,20cyclictest4143301-21latency_hist21:40:022
4124414996525,36cyclictest4159973-21ssh22:20:010
4124414996519,28cyclictest16850irq/134-800000021:52:560
4124414996510,13cyclictest20995-21ssh00:30:420
412442599642,57cyclictest4126974-21munin-run20:00:013
4124425996424,35cyclictest4162796-21sh22:26:283
412442599641,59cyclictest687-21ssh23:42:253
412442599641,59cyclictest5217-21ssh23:53:203
412442599641,59cyclictest4188813-21ssh23:28:303
412442599641,59cyclictest4188813-21ssh23:28:303
412442599641,59cyclictest4174962-21ssh22:55:283
412442599641,59cyclictest4169173-21ssh22:41:453
412442599641,59cyclictest4146633-21ssh21:48:143
412442599641,59cyclictest4143719-21ssh21:41:023
412442599641,59cyclictest4135636-21ssh21:21:523
412442599641,59cyclictest4128985-21sshd20:37:123
412442599641,59cyclictest18989-21ssh00:25:553
412442599641,59cyclictest17570-21ssh00:22:413
4124425996410,50cyclictest2443-21ssh23:46:393
412442399643,19cyclictest4127964-21cron20:20:002
4124423996422,37cyclictest4162198-21latency_hist22:25:022
4124423996421,5cyclictest5840-21latency_hist23:55:012
412441899645,16cyclictest4176636-21cut23:00:011
412441899644,17cyclictest1644-21unin-run23:45:001
4124418996423,12cyclictest275-21dbus-daemon22:10:011
4124418996414,10cyclictest4129541-21munin-plugin-st20:50:001
412442599632,57cyclictest4137325-21ssh21:25:473
412442599632,55cyclictest364-21snmpd19:30:273
412442599631,58cyclictest8794-21ssh00:01:353
412442599631,58cyclictest4183995-21ssh23:17:053
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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