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2026-09-28 - 16:56

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 Mon Sep 28, 2026 00:44:16)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
8235599305713,3040cyclictest98596-21kworker/2:1+events20:04:382
8234899296714,2950cyclictest151124-21kworker/0:2+events23:00:170
8235899294414,2926cyclictest172006-21kworker/3:0+events23:55:193
8234899282213,2805cyclictest87346-21kworker/0:2+events19:30:140
8234899281811,2803cyclictest173708-21kworker/0:2+events00:00:110
8235899279711,2782cyclictest104923-21kworker/3:0+events20:20:193
8235399279513,2778cyclictest154377-21kworker/1:2+events23:40:151
8234899277913,2763cyclictest154360-21kworker/0:1+events22:55:190
8235899275313,2738cyclictest89013-21kworker/3:1+events20:05:003
8235899270711,2693cyclictest96840-21kworker/3:0+events19:58:313
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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