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2026-07-25 - 09:56

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 Sat Jul 25, 2026 00:44:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
4155967995147,3cyclictest4123729-21kworker/u8:0+flush-259:019:15:003
4155964994845,2cyclictest13832-21kworker/u8:1+events_unbound20:11:452
4155962994538,4cyclictest4108008-21kworker/u8:3+flush-259:019:40:141
4155957994540,3cyclictest4108008-21kworker/u8:3+flush-259:020:15:250
4155964994440,3cyclictest249041-21kworker/u8:4+events_unbound00:05:292
4155962994437,4cyclictest259184-21latency_hist23:55:001
4155957994339,3cyclictest159677-21kworker/u8:4+events_unbound22:40:240
4155964994239,2cyclictest232808-21kworker/u8:3+events_unbound00:03:302
4155964994238,3cyclictest70399-21kworker/u8:1+events_unbound21:30:292
4155957994134,5cyclictest43921-21ntpq20:25:190
4155964994037,2cyclictest4108008-21kworker/u8:3+events_unbound21:29:282
4155957994037,2cyclictest269777-21kworker/u8:1+flush-259:000:30:100
4155967993933,4cyclictest335557-21systemd-journal19:40:013
4155964993936,2cyclictest13832-21kworker/u8:1+events_unbound20:05:142
4155964993936,2cyclictest133761-21kworker/u8:1+events_unbound22:00:142
4155957993936,2cyclictest4108008-21kworker/u8:3+flush-259:020:50:250
4155957993936,2cyclictest4108008-21kworker/u8:3+events_unbound21:10:230
4155964993835,2cyclictest97069-21kworker/u8:2+events_unbound22:44:312
4155964993835,2cyclictest269777-21kworker/u8:1+events_unbound00:32:552
4155964993835,2cyclictest159677-21kworker/u8:4+events_unbound22:39:302
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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