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2026-05-05 - 23:45

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 Tue May 05, 2026 12:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2067031213460,69sleep30-21swapper/33
206707328555,12sleep10-21swapper/11
206693628466,12sleep20-21swapper/22
206693427548,16sleep00-21swapper/00
2067386992522,1cyclictest0-21swapper/33
21817162240,3sleep20-21swapper/22
2067386992420,2cyclictest0-21swapper/33
22206132231,9sleep02198242-21diskmemload0
206738699235,14cyclictest2404912-21taskset3
206738699222,16cyclictest0-21swapper/33
206738699211,3cyclictest0-21swapper/33
206738699211,17cyclictest0-21swapper/33
206738699211,16cyclictest2206649-21taskset3
206738699201,15cyclictest66950irq/132-enp1s0-TxRx-33
206738699201,14cyclictest0-21swapper/33
23609732191,5sleep02198242-21diskmemload0
22752052191,9sleep12275217-21ssh1
206738699198,8cyclictest2371919-21turbostat3
206738699192,14cyclictest66950irq/132-enp1s0-TxRx-33
2067386991911,5cyclictest66950irq/132-enp1s0-TxRx-33
206738699191,15cyclictest2247739-21taskset3
206738699191,15cyclictest0-21swapper/33
206738699191,15cyclictest0-21swapper/33
206738699191,15cyclictest0-21swapper/33
206738699191,14cyclictest0-21swapper/33
206738699191,14cyclictest0-21swapper/33
206738699191,14cyclictest0-21swapper/33
206738699191,13cyclictest0-21swapper/33
2067386991910,5cyclictest2107142-21turbostat3
2067386991816,1cyclictest0-21swapper/33
2067386991815,1cyclictest0-21swapper/33
2067386991814,3cyclictest66950irq/132-enp1s0-TxRx-33
2067386991814,3cyclictest66950irq/132-enp1s0-TxRx-33
2067386991811,4cyclictest66950irq/132-enp1s0-TxRx-33
206738699181,14cyclictest0-21swapper/33
206738699181,14cyclictest0-21swapper/33
206738699181,14cyclictest0-21swapper/33
206738699181,13cyclictest0-21swapper/33
206738699181,13cyclictest0-21swapper/33
206738699181,13cyclictest0-21swapper/33
206738699181,13cyclictest0-21swapper/33
206738699181,13cyclictest0-21swapper/33
206738699181,13cyclictest0-21swapper/33
206738699181,13cyclictest0-21swapper/33
206738699180,15cyclictest0-21swapper/33
25224502171,2sleep20-21swapper/22
25006952171,3sleep00-21swapper/00
22221132171,3sleep20-21swapper/22
206738699176,8cyclictest2160963-21turbostat3
206738699172,10cyclictest2182508-21taskset3
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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