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2025-09-18 - 20:09

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 Sep 18, 2025 00:44:18)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
78895599283313,2815cyclictest871026-21kworker/3:2+events23:35:193
78894999282813,2811cyclictest866222-21kworker/1:0+events23:26:081
78895599277413,2757cyclictest808438-21kworker/3:2+events20:10:173
78894499277213,2754cyclictest885439-21kworker/0:2+events00:25:170
78895399276412,2746cyclictest820928-21kworker/2:2+events20:55:122
78895399273914,2722cyclictest824260-21kworker/2:1+events21:05:012
78895599265213,2635cyclictest861301-21kworker/3:1+events23:32:403
78895599264413,2628cyclictest816286-21kworker/3:1+events20:45:143
78895399264112,2627cyclictest882267-21kworker/2:1+events00:05:142
78894499261210,2599cyclictest846847-21kworker/0:1+events22:30:220
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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