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2026-01-01 - 09:41

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 Thu Jan 01, 2026 00:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
84455499587525,5846cyclictest844348-21kworker/2:1+events19:11:572
84454799574219,5719cyclictest844112-21kworker/0:0+events19:11:330
84455299569826,5668cyclictest831820-21kworker/1:1+events19:11:111
8445579928159,2803cyclictest843772-21kworker/3:1+events19:12:443
84454799276713,2751cyclictest926534-21kworker/0:0+events23:25:350
84455499274813,2730cyclictest910748-21kworker/2:1+events22:50:122
84455299269314,2675cyclictest851127-21kworker/1:0+events19:30:171
84454799264112,2625cyclictest910467-21kworker/0:1+events22:35:160
84454799262413,2608cyclictest873490-21kworker/0:1+events20:40:160
84455299251612,2501cyclictest869005-21kworker/1:1+events20:35:191
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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