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2026-08-03 - 11:02

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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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 Aug 03, 2026 00:44:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3592162995951,5cyclictest3883838-21latency_hist23:50:011
3592168995350,2cyclictest3695592-21kworker/u8:1+flush-259:021:35:203
3592166995246,4cyclictest335557-21systemd-journal23:40:012
3592158994842,4cyclictest3623235-21latency_hist19:40:000
3592168994743,3cyclictest3576836-21kworker/u8:3+flush-259:020:15:543
3592168994643,2cyclictest3685358-21kworker/u8:2+events_unbound20:45:003
3592158994640,4cyclictest3644251-21latency_hist20:00:000
3592158994441,2cyclictest3716356-21kworker/u8:3+events_unbound23:15:000
3592168994339,2cyclictest3695592-21kworker/u8:1+events_unbound22:20:193
3592166994338,3cyclictest3695592-21kworker/u8:1+events_unbound21:35:222
3592166994337,4cyclictest509-21rs:main2
3592166994337,4cyclictest3695926-21latency_hist20:50:012
3592162994336,5cyclictest3847324-21latency_hist23:15:011
3592168994138,2cyclictest3884074-21kworker/u8:4+events_unbound00:10:533
3592168994137,3cyclictest3884074-21kworker/u8:4+events_unbound00:23:173
3592168994137,3cyclictest3638448-21kworker/u8:0+events_unbound20:54:543
3592166994037,2cyclictest3716356-21kworker/u8:3+events_unbound22:25:232
3592166994036,3cyclictest3716872-21apt-get21:10:112
3592162994034,4cyclictest335557-21systemd-journal21:26:051
3592158994036,3cyclictest3607674-21kworker/u8:1+flush-259:019:45:540
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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