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2026-05-14 - 09:48

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 Thu May 14, 2026 00:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
357070721250,2sleep1171rcu_preempt1
3240844212253,64sleep30-21swapper/33
324083728668,12sleep10-21swapper/11
324102228453,12sleep20-21swapper/22
324088427959,14sleep00-21swapper/00
324129999241,18cyclictest3418380-21chrt3
324129999221,17cyclictest3429348-21taskset3
324129999213,5cyclictest0-21swapper/33
324129999211,16cyclictest3378800-21taskset3
324129999211,16cyclictest0-21swapper/33
35643932200,8sleep134-21ksoftirqd/11
34569932202,6sleep13457017-21apt-get1
33858512201,4sleep23371482-21diskmemload2
324129999204,13cyclictest0-21swapper/33
324129999203,14cyclictest66950irq/132-enp1s0-TxRx-33
324129999201,15cyclictest0-21swapper/33
34958292191,7sleep13495841-21rm1
3241299991916,1cyclictest0-21swapper/33
324129999191,2cyclictest0-21swapper/33
324129999191,15cyclictest0-21swapper/33
324129999191,14cyclictest0-21swapper/33
324129999191,14cyclictest0-21swapper/33
324129999191,14cyclictest0-21swapper/33
324129999191,14cyclictest0-21swapper/33
324129999191,14cyclictest0-21swapper/33
324129999191,14cyclictest0-21swapper/33
324129999191,14cyclictest0-21swapper/33
324129999191,14cyclictest0-21swapper/33
3241299991910,6cyclictest0-21swapper/33
324129999190,16cyclictest66950irq/132-enp1s0-TxRx-33
324129999190,16cyclictest3505267-21taskset3
33077872181,5sleep03307805-21apt-get0
324129999181,14cyclictest0-21swapper/33
324129999181,14cyclictest0-21swapper/33
324129999181,14cyclictest0-21swapper/33
324129999181,14cyclictest0-21swapper/33
324129999181,14cyclictest0-21swapper/33
324129999181,14cyclictest0-21swapper/33
324129999181,14cyclictest0-21swapper/33
324129999181,14cyclictest0-21swapper/33
324129999181,14cyclictest0-21swapper/33
324129999181,14cyclictest0-21swapper/33
324129999181,14cyclictest0-21swapper/33
324129999181,13cyclictest0-21swapper/33
324129999181,13cyclictest0-21swapper/33
324129999181,13cyclictest0-21swapper/33
324129999181,13cyclictest0-21swapper/33
324129999180,15cyclictest0-21swapper/33
324129999180,14cyclictest0-21swapper/33
34039712171,3sleep20-21swapper/22
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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