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2026-07-29 - 05:34

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, 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.

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 rack7slot3s.osadl.org (updated Wed Jul 29, 2026 00:43:38)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1169521690,5sleep02177799cyclictest22:43:010
2731721670,5sleep32178099cyclictest21:42:233
21777991314,37cyclictest21849-21ssh22:15:470
217779912433,12cyclictest13480-21/usr/sbin/munin00:05:550
217779912433,12cyclictest13480-21/usr/sbin/munin00:05:550
21777991093,71cyclictest0-21swapper/022:00:540
2233121020,4sleep031446-21kworker/0:200:15:490
2177799944,56cyclictest0-21swapper/021:35:480
2177799944,56cyclictest0-21swapper/021:35:480
2177799933,56cyclictest0-21swapper/021:25:360
21777999038,3cyclictest0-21swapper/022:05:360
21777999038,3cyclictest0-21swapper/022:05:360
309712890,6sleep32178099cyclictest19:35:263
2177799882,50cyclictest0-21swapper/023:40:370
21777998749,3cyclictest7950irq/56-dwc_otg_00:10:380
21777998643,20cyclictest750-21snmpd00:35:430
21778998369,9cyclictest10296-21ls22:00:551
58452790,12sleep12177899cyclictest00:35:441
21780997928,22cyclictest8050irq/56-dwc_otg_22:15:473
21779997910,27cyclictest7950irq/56-dwc_otg_00:35:442
21780997749,22cyclictest14336-21/usr/sbin/munin00:05:553
21780997749,22cyclictest14336-21/usr/sbin/munin00:05:553
2177899775,38cyclictest0-21swapper/122:55:381
111122750,2sleep00-21swapper/020:10:250
21780997446,23cyclictest7084-21ssh23:17:013
21780997416,52cyclictest0-21swapper/323:50:353
21780997326,19cyclictest8050irq/56-dwc_otg_00:35:413
2177999736,19cyclictest8050irq/56-dwc_otg_19:55:332
2177799736,25cyclictest0-21swapper/019:40:380
2177799733,49cyclictest0-21swapper/023:50:360
21779997115,25cyclictest7850irq/56-dwc_otg22:15:462
54062700,2sleep30-21swapper/321:15:493
2177799705,20cyclictest0-21swapper/023:17:000
26712690,2sleep2301ktimersoftd/221:12:102
19892690,2sleep10-21swapper/121:10:561
21780996837,25cyclictest21931-21ssh21:35:503
21780996837,25cyclictest21931-21ssh21:35:503
2177899683,44cyclictest0-21swapper/122:15:451
21780996729,21cyclictest30381-21/usr/sbin/munin23:45:523
2177899678,51cyclictest0-21swapper/100:10:381
2177799671,37cyclictest0-21swapper/019:25:360
21780996637,23cyclictest10223-21sort22:00:543
21780996625,17cyclictest31669-21ls19:35:473
2177799662,35cyclictest30196-21fschecks_time00:25:440
21780996517,29cyclictest27549-21ssh23:02:253
2177799644,33cyclictest0-21swapper/019:20:560
21777996411,30cyclictest9-21ksoftirqd/023:15:260
2177799632,30cyclictest0-21swapper/000:35:260
21777996235,14cyclictest8050irq/56-dwc_otg_20:25:250
2177899617,30cyclictest14309-21ntpq00:05:541
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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