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2026-08-30 - 18:07

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #4

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
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rackeslot4s.osadl.org (updated Sun Aug 30, 2026 12:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
769265994134,5cyclictest335557-21systemd-journal12:30:000
769276994036,3cyclictest1060966-21kworker/u8:2+flush-259:012:00:253
769270994035,3cyclictest894922-21cat09:10:012
769267994036,3cyclictest920578-21latency_hist09:35:021
769267993936,2cyclictest982696-21kworker/u8:3+flush-259:010:50:251
769270993834,3cyclictest779815-21kworker/u8:2+flush-259:007:55:252
769265993833,4cyclictest883969-21latency_hist09:00:000
769267993734,2cyclictest936080-21kworker/u8:2+flush-259:010:10:241
769267993733,3cyclictest731052-21kworker/u8:1+flush-259:007:50:231
769267993733,3cyclictest1076689-21apt-get12:05:101
769265993733,3cyclictest998728-21apt-get10:50:120
769265993730,5cyclictest1091966-21latency_hist12:20:000
769276993327,4cyclictest894778-21cat09:10:013
769267993328,3cyclictest1071558-21apt-get12:00:121
769265993329,3cyclictest936080-21kworker/u8:2+flush-259:009:55:230
769276993226,4cyclictest1044143-21ntpq11:30:213
769267993229,2cyclictest779815-21kworker/u8:2+flush-259:008:00:241
769267993229,2cyclictest731052-21kworker/u8:1+events_unbound07:40:251
769265993228,3cyclictest910503-21apt-get09:25:110
769265993228,3cyclictest769229-21kworker/u8:4+events_unbound07:15:230
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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