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2026-06-18 - 03:15

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 Wed Jun 17, 2026 00:44:19)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
178090199340815,3389cyclictest1883807-21kworker/0:1+events00:35:020
178090999328014,3261cyclictest1857885-21kworker/2:2+events23:40:172
178090499310714,3088cyclictest1843401-21kworker/1:0+events22:30:121
178091199302014,3003cyclictest1831270-21kworker/3:1+events21:55:183
178090499291514,2898cyclictest1871799-21kworker/1:1+events23:55:001
178090499291514,2898cyclictest1871799-21kworker/1:1+events23:55:001
178091199287114,2853cyclictest1782205-21kworker/3:0+events19:15:173
178090199284313,2826cyclictest1867070-21kworker/0:0+events23:59:590
178090199284313,2826cyclictest1867070-21kworker/0:0+events00:00:000
178091199283414,2817cyclictest1831270-21kworker/3:1+events21:50:023
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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