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2025-11-17 - 02:44

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #1, slot #6

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
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rack1slot6s.osadl.org (updated Mon Nov 17, 2025 00:43:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2437991140,23rtkit-daemon0-21swapper/019:59:541
2437991130,22rtkit-daemon0-21swapper/019:56:471
2437991120,22rtkit-daemon0-21swapper/022:56:021
2437991100,23rtkit-daemon0-21swapper/022:15:561
2437991100,23rtkit-daemon0-21swapper/019:15:491
2437991100,22rtkit-daemon0-21swapper/020:26:011
243799990,21rtkit-daemon0-21swapper/022:14:120
243799980,21rtkit-daemon0-21swapper/022:29:110
243799980,21rtkit-daemon0-21swapper/019:39:180
243799970,21rtkit-daemon0-21swapper/022:34:180
243799970,20rtkit-daemon0-21swapper/022:09:120
243799970,19rtkit-daemon0-21swapper/022:59:100
243799970,19rtkit-daemon0-21swapper/021:49:200
243799970,19rtkit-daemon0-21swapper/019:14:340
243799960,20rtkit-daemon0-21swapper/019:59:240
243799950,21rtkit-daemon0-21swapper/021:57:570
243799950,21rtkit-daemon0-21swapper/021:57:570
243799950,21rtkit-daemon0-21swapper/019:19:260
243799950,20rtkit-daemon0-21swapper/022:04:120
243799940,19rtkit-daemon0-21swapper/020:19:310
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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