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2026-07-13 - 08:14

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 Mon Jul 13, 2026 00:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3436525994731,5cyclictest3576772-21latency_hist21:25:013
3436515994138,2cyclictest3560232-21kworker/u8:0+flush-259:021:55:000
3436519993228,3cyclictest3665891-21kworker/u8:2+flush-259:022:55:001
3436515993229,2cyclictest3560232-21kworker/u8:0+events_unbound22:20:000
3436521993127,3cyclictest3738191-21journal-offline23:57:102
3436521992824,3cyclictest3676081-21gpgv23:00:002
3436521992824,3cyclictest3560232-21kworker/u8:0+flush-259:022:25:002
3436525992620,4cyclictest3529808-21/usr/sbin/munin20:40:243
3436525992619,4cyclictest3712640-21latency_hist23:35:023
3436519992621,3cyclictest3749254-21latency_hist00:10:011
3436515992522,2cyclictest3477696-21kworker/u8:1+events_unbound20:05:200
3436519992419,3cyclictest3722025-21kworker/u8:0+events_unbound00:35:001
3436515992421,2cyclictest3560232-21kworker/u8:0+flush-259:022:20:160
3436515992419,4cyclictest3686799-21latency_hist23:10:000
3436525992318,3cyclictest3728146-21kworker/u8:2+flush-259:023:55:143
3436521992319,3cyclictest500-21systemd-logind22:50:012
3436519992317,4cyclictest335557-21systemd-journal21:20:011
3436515992320,2cyclictest3765272-21kworker/u8:2+flush-259:000:29:590
3436515992319,3cyclictest3508578-21kworker/u8:0+events_unbound20:27:100
3436515992319,3cyclictest3477696-21kworker/u8:1+events_unbound20:15:130
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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