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2025-11-14 - 17:04

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #5

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.
Unexpectedly long latencies may be caused by SMIs
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 rackeslot5s.osadl.org (updated Fri Nov 14, 2025 12:44:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
4064992422,1cyclictest5794-21cron08:20:010
406499240,23cyclictest0-21swapper/011:16:280
4077992322,1cyclictest8459-21apt-get11:46:283
4077992322,1cyclictest23786-21apt-get07:51:293
4077992322,0cyclictest0-21swapper/309:46:293
4077992321,1cyclictest0-21swapper/307:50:003
407799230,22cyclictest17097-21apt-get09:51:303
4073992322,1cyclictest612-21gdbus09:15:002
4068992323,0cyclictest0-21swapper/111:56:301
406899230,22cyclictest28089-21munin-run11:20:001
406899230,1cyclictest0-21swapper/108:40:001
4064992322,0cyclictest6804-21apt-get07:16:290
4077992220,1cyclictest15451-21perf08:40:003
407799220,2cyclictest21533-21dump-pmu-power10:00:003
407799220,21cyclictest0-21swapper/309:26:303
407799220,21cyclictest0-21swapper/308:00:003
407799220,1cyclictest0-21swapper/307:45:003
4073992220,1cyclictest9520-21sleep09:35:002
4073992220,1cyclictest593-21dbus-daemon10:50:002
4073992220,1cyclictest20611-21apt-get08:51:272
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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