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2026-09-06 - 01:50

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #f, slot #7

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, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 10 highest latencies:
System rackfslot7s.osadl.org (updated Sat Sep 05, 2026 00:44:18)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
193340199338612,3370cyclictest1950860-21kworker/2:1+events20:05:002
193339699336914,3352cyclictest1958960-21kworker/1:2+events20:30:011
193339399292814,2911cyclictest1975429-21kworker/0:1+events21:35:130
193339699289614,2878cyclictest2019723-21kworker/1:2+events23:55:001
193339399287414,2855cyclictest2026247-21kworker/0:0+events00:05:120
193339399287414,2855cyclictest2026247-21kworker/0:0+events00:05:120
193340199283013,2815cyclictest1962109-21kworker/2:2+events20:40:012
193339699279011,2774cyclictest1943439-21kworker/1:1+events19:55:111
193340699278913,2772cyclictest2013537-21kworker/3:2+events23:25:173
193340199275713,2740cyclictest1936829-21kworker/2:1+events19:25:192
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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