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2026-08-05 - 08:26

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #1, slot #6

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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  Intel
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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
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rack1slot6s.osadl.org (updated Wed Aug 05, 2026 00:43:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2194991050,4rtkit-daemon2193-21rtkit-daemon22:37:420
4931991033,47cyclictest0-21swapper/021:14:150
4931991016,38cyclictest0-21swapper/019:47:080
4931999824,13cyclictest0-21swapper/023:32:030
493199963,37cyclictest0-21swapper/022:19:370
493199944,42cyclictest0-21swapper/020:26:310
4931999437,14cyclictest0-21swapper/022:11:190
493199924,27cyclictest0-21swapper/020:51:150
4931999237,13cyclictest0-21swapper/021:56:070
493199914,27cyclictest0-21swapper/020:56:240
493199913,35cyclictest0-21swapper/019:07:270
493199904,34cyclictest0-21swapper/022:52:570
219499900,4rtkit-daemon2193-21rtkit-daemon22:56:563
493199895,29cyclictest0-21swapper/023:26:160
493199894,41cyclictest0-21swapper/022:46:040
493199894,41cyclictest0-21swapper/022:46:040
493199894,37cyclictest0-21swapper/018:46:270
493199894,37cyclictest0-21swapper/018:46:270
493199894,29cyclictest0-21swapper/020:46:250
4931998736,13cyclictest0-21swapper/020:31:290
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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