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2026-03-14 - 08:11

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 Sat Mar 14, 2026 00:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811981212355,62sleep30-21swapper/33
81684128959,12sleep20-21swapper/22
81672127860,12sleep10-21swapper/11
81693127759,13sleep00-21swapper/00
81709799248,13cyclictest0-21swapper/33
817097992421,1cyclictest0-21swapper/33
817097992410,12cyclictest0-21swapper/33
817097992410,12cyclictest0-21swapper/33
81709799238,12cyclictest0-21swapper/33
817097992320,1cyclictest0-21swapper/33
81709799227,13cyclictest0-21swapper/33
81709799223,12cyclictest1080004-21taskset3
817097992220,1cyclictest0-21swapper/33
817097992219,1cyclictest0-21swapper/33
817097992219,1cyclictest0-21swapper/33
817097992218,2cyclictest0-21swapper/33
817097992218,2cyclictest0-21swapper/33
817097992210,8cyclictest991091-21chrt3
817097992119,1cyclictest0-21swapper/33
817097992119,1cyclictest0-21swapper/33
817097992119,1cyclictest0-21swapper/33
817097992118,1cyclictest0-21swapper/33
817097992117,2cyclictest0-21swapper/33
817097992117,2cyclictest0-21swapper/33
817097992117,2cyclictest0-21swapper/33
817097992117,1cyclictest0-21swapper/33
81709799211,16cyclictest956820-21taskset3
81709799211,15cyclictest0-21swapper/33
81709799210,1cyclictest0-21swapper/33
81709799210,18cyclictest1096565-21chrt3
13036592211,7sleep21303719-21ntpq2
817097992017,2cyclictest0-21swapper/33
817097992017,1cyclictest0-21swapper/33
817097992017,1cyclictest0-21swapper/33
817097992017,1cyclictest0-21swapper/33
817097992017,1cyclictest0-21swapper/33
817097992010,7cyclictest0-21swapper/33
81709799196,2cyclictest0-21swapper/33
81709799195,2cyclictest1105522-21taskset3
817097991916,1cyclictest0-21swapper/33
817097991916,1cyclictest0-21swapper/33
817097991916,1cyclictest0-21swapper/33
817097991914,3cyclictest0-21swapper/33
81709799191,14cyclictest0-21swapper/33
817097991910,6cyclictest856978-21chrt3
81709799190,8cyclictest1111708-21taskset3
81709799182,13cyclictest0-21swapper/33
817097991815,2cyclictest0-21swapper/33
817097991815,1cyclictest0-21swapper/33
817097991814,2cyclictest0-21swapper/33
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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