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2026-04-21 - 23:47

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 Apr 21, 2026 12:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2487505211963,51sleep30-21swapper/33
290048521090,2sleep00-21swapper/00
2492159210698,5sleep20-21swapper/22
249250928064,10sleep10-21swapper/11
249226027958,15sleep00-21swapper/00
2492618992420,2cyclictest0-21swapper/33
28841362221,3sleep00-21swapper/00
249261899221,17cyclictest2780788-21taskset3
249261899211,17cyclictest0-21swapper/33
249261899211,16cyclictest2956277-21taskset3
29741842201,2sleep10-21swapper/11
27824282200,1sleep00-21swapper/00
2492618992017,1cyclictest0-21swapper/33
2492618992017,1cyclictest0-21swapper/33
2492618992017,1cyclictest0-21swapper/33
2492618992011,6cyclictest0-21swapper/33
249261899201,15cyclictest66950irq/132-enp1s0-TxRx-33
249261899200,3cyclictest0-21swapper/33
29879072191,8sleep22988046-21systemctl2
28685672191,3sleep10-21swapper/11
2492618991915,2cyclictest0-21swapper/33
2492618991912,5cyclictest0-21swapper/33
249261899191,15cyclictest2564409-21taskset3
249261899191,15cyclictest0-21swapper/33
249261899191,14cyclictest0-21swapper/33
249261899191,14cyclictest0-21swapper/33
249261899191,14cyclictest0-21swapper/33
249261899190,2cyclictest0-21swapper/33
249261899190,15cyclictest0-21swapper/33
249261899190,15cyclictest0-21swapper/33
29637272181,3sleep00-21swapper/00
27077702181,8sleep02623107-21diskmemload0
2492618991816,1cyclictest0-21swapper/33
249261899181,5cyclictest66950irq/132-enp1s0-TxRx-33
2492618991815,1cyclictest0-21swapper/33
2492618991815,1cyclictest0-21swapper/33
249261899181,14cyclictest2497572-21taskset3
249261899181,14cyclictest0-21swapper/33
249261899181,14cyclictest0-21swapper/33
249261899181,14cyclictest0-21swapper/33
249261899181,14cyclictest0-21swapper/33
249261899181,14cyclictest0-21swapper/33
249261899181,14cyclictest0-21swapper/33
249261899181,13cyclictest0-21swapper/33
249261899181,13cyclictest0-21swapper/33
249261899181,13cyclictest0-21swapper/33
249261899181,12cyclictest2623121-21turbostat3
249261899180,1cyclictest0-21swapper/33
249261899180,15cyclictest66950irq/132-enp1s0-TxRx-33
249261899180,14cyclictest0-21swapper/33
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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