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2026-08-16 - 03:20

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 Aug 16, 2026 00:43:53)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
472820216653,108sleep30-21swapper/33
472820216653,108sleep30-21swapper/33
56457521300,2sleep20-21swapper/22
47276328453,12sleep10-21swapper/11
47276328453,12sleep10-21swapper/11
47284928356,12sleep20-21swapper/22
47284928356,12sleep20-21swapper/22
47250827853,18sleep00-21swapper/00
47250827853,18sleep00-21swapper/00
47302899281,14cyclictest671187-21chrt3
6182272251,2sleep20-21swapper/22
6182272251,2sleep20-21swapper/22
9644032220,2sleep10-21swapper/11
9347082210,2sleep00-21swapper/00
7582672212,6sleep2601162-21diskmemload2
47302899213,3cyclictest939733-21taskset3
47302899212,16cyclictest66950irq/132-enp1s0-TxRx-33
47302899211,5cyclictest896838-21taskset3
47302899211,15cyclictest0-21swapper/33
47302899211,15cyclictest0-21swapper/33
47302899202,12cyclictest758276-21taskset3
473028992016,2cyclictest0-21swapper/33
47302899201,15cyclictest601941-21taskset3
47302899201,15cyclictest0-21swapper/33
47302899201,15cyclictest0-21swapper/33
47302899201,15cyclictest0-21swapper/33
47302899201,15cyclictest0-21swapper/33
7026452191,8sleep2702656-21ssh2
5803822192,5sleep2580401-21apt-get2
47302899191,15cyclictest0-21swapper/33
47302899191,15cyclictest0-21swapper/33
47302899191,15cyclictest0-21swapper/33
47302899191,15cyclictest0-21swapper/33
47302899191,15cyclictest0-21swapper/33
47302899191,14cyclictest0-21swapper/33
47302899191,14cyclictest0-21swapper/33
47302899191,14cyclictest0-21swapper/33
47302899191,14cyclictest0-21swapper/33
47302899191,12cyclictest0-21swapper/33
47302899190,16cyclictest0-21swapper/33
7801972181,11sleep0780428-21grep0
6667622180,8sleep10-21swapper/11
473028991812,4cyclictest0-21swapper/33
47302899181,14cyclictest66950irq/132-enp1s0-TxRx-33
47302899181,14cyclictest66950irq/132-enp1s0-TxRx-33
47302899181,14cyclictest0-21swapper/33
47302899181,14cyclictest0-21swapper/33
47302899181,14cyclictest0-21swapper/33
47302899181,14cyclictest0-21swapper/33
47302899181,13cyclictest0-21swapper/33
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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