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2025-12-02 - 12:49

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #1

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 20 highest latencies:
System rack4slot1s.osadl.org (updated Tue Dec 02, 2025 00:44:11)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
972621110,2sleep20-21swapper/219:59:112
972621110,2sleep20-21swapper/219:59:112
148832930,3chrt0-21swapper/220:14:062
148832930,3chrt0-21swapper/220:14:062
73882910,4sleep17392-21unixbench_singl22:44:111
73882910,4sleep17392-21unixbench_singl22:44:111
123742780,3sleep30-21swapper/300:24:073
66972670,2sleep30-21swapper/321:19:003
66972670,2sleep30-21swapper/321:19:003
84172660,4sleep10-21swapper/100:14:081
84172660,4sleep10-21swapper/100:14:081
67822660,3sleep20-21swapper/222:44:042
67822660,3sleep20-21swapper/222:44:042
283942630,3sleep20-21swapper/222:14:102
283942630,3sleep20-21swapper/222:14:102
324352580,3chrt0-21swapper/222:27:002
324352580,3chrt0-21swapper/222:27:002
2395399572,39cyclictest12064-21chrt21:33:560
2395399572,39cyclictest12064-21chrt21:33:560
2395499561,10cyclictest181rcu_preempt23:09:011
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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