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2026-09-13 - 09:13

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, slot #3

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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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 50 highest latencies:
System rack3slot3s.osadl.org (updated Sun Sep 13, 2026 00:43:53)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
387638212160,56sleep30-21swapper/33
387771211094,10sleep10-21swapper/11
38790528152,10sleep20-21swapper/22
38337227955,14sleep00-21swapper/00
38814399211,16cyclictest0-21swapper/33
38814399211,16cyclictest0-21swapper/33
38814399211,15cyclictest6109322sleep33
38814399203,13cyclictest0-21swapper/33
38814399201,6cyclictest0-21swapper/33
38814399201,16cyclictest868441-21chrt3
38814399201,15cyclictest0-21swapper/33
38814399200,16cyclictest0-21swapper/33
38814399200,13cyclictest0-21swapper/33
7983542190,2sleep00-21swapper/00
6309922191,7sleep1631006-21ssh1
388143991916,1cyclictest0-21swapper/33
388143991916,1cyclictest0-21swapper/33
388143991915,2cyclictest66950irq/132-enp1s0-TxRx-33
388143991912,4cyclictest505323-21taskset3
388143991912,4cyclictest0-21swapper/33
38814399191,16cyclictest0-21swapper/33
38814399191,15cyclictest0-21swapper/33
38814399191,15cyclictest0-21swapper/33
38814399191,14cyclictest0-21swapper/33
38814399191,14cyclictest0-21swapper/33
38814399191,14cyclictest0-21swapper/33
38814399191,14cyclictest0-21swapper/33
38814399191,14cyclictest0-21swapper/33
38814399191,14cyclictest0-21swapper/33
38814399190,16cyclictest0-21swapper/33
38814399190,12cyclictest0-21swapper/33
5349572183,4sleep014-21ksoftirqd/00
5349572183,4sleep014-21ksoftirqd/00
5112952181,5sleep0511555-21df_inode0
38814399181,4cyclictest0-21swapper/33
388143991812,3cyclictest0-21swapper/33
38814399181,14cyclictest0-21swapper/33
38814399181,14cyclictest0-21swapper/33
38814399181,14cyclictest0-21swapper/33
38814399181,14cyclictest0-21swapper/33
38814399181,14cyclictest0-21swapper/33
38814399181,14cyclictest0-21swapper/33
38814399181,14cyclictest0-21swapper/33
38814399181,14cyclictest0-21swapper/33
38814399181,14cyclictest0-21swapper/33
38814399181,13cyclictest0-21swapper/33
38814399181,13cyclictest0-21swapper/33
38814399181,13cyclictest0-21swapper/33
38814399180,15cyclictest0-21swapper/33
38814399180,14cyclictest66950irq/132-enp1s0-TxRx-33
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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