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2026-04-23 - 12:53

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 Thu Apr 23, 2026 00:44:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
115495995346,5cyclictest302814-21cp22:10:000
115505994640,4cyclictest252-21systemd-journal20:45:153
115499994643,2cyclictest308525-21kworker/u8:1+events_unbound22:20:151
115505994236,4cyclictest349717-21cat22:55:013
115501994238,3cyclictest225571-21kworker/u8:4+flush-259:021:00:012
115501994032,3cyclictest127217-21kworker/u8:1+events_unbound19:55:232
115495994036,3cyclictest224921-21apt-get20:55:000
115501993933,4cyclictest252-21systemd-journal22:25:152
115495993935,3cyclictest334312-21kworker/u8:0+flush-259:023:00:150
115501993835,2cyclictest127217-21kworker/u8:1+events_unbound21:15:252
115501993832,4cyclictest308525-21kworker/u8:1+events_unbound22:40:012
115501993832,4cyclictest245996-21latency_hist21:15:002
115499993834,3cyclictest78370-21kworker/u8:0+flush-259:019:10:131
115495993732,4cyclictest172053-21ntpq20:00:230
115501993633,2cyclictest127217-21kworker/u8:1+flush-259:020:50:172
115499993632,3cyclictest438346-21apt-get00:20:111
115499993632,3cyclictest225571-21kworker/u8:4+events_unbound20:55:191
115495993633,2cyclictest448405-21kworker/u8:0+flush-259:000:35:190
115501993530,3cyclictest308525-21kworker/u8:1+events_unbound23:15:172
115501993431,2cyclictest432931-21kworker/u8:3+flush-259:000:25:212
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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