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2026-04-08 - 05:09

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 Wed Apr 08, 2026 00:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1751099212457,62sleep30-21swapper/33
175083028567,12sleep20-21swapper/22
175095428062,11sleep10-21swapper/11
175108627656,14sleep00-21swapper/00
190542122910,7sleep01905432-21ssh0
21707182261,21sleep21882179-21diskmemload2
175135599221,17cyclictest1888681-21taskset3
175135599212,16cyclictest0-21swapper/33
175135599211,7cyclictest2110087-21taskset3
1751355992111,7cyclictest0-21swapper/33
175135599211,16cyclictest66950irq/132-enp1s0-TxRx-33
175135599211,16cyclictest0-21swapper/33
175135599210,19cyclictest0-21swapper/33
1751355992011,6cyclictest2180107-21taskset3
1751355992011,5cyclictest0-21swapper/33
175135599201,15cyclictest0-21swapper/33
175135599201,15cyclictest0-21swapper/33
1751355992010,7cyclictest1802536-21taskset3
1751355991913,3cyclictest0-21swapper/33
175135599191,15cyclictest66950irq/132-enp1s0-TxRx-33
175135599191,14cyclictest2090261-21taskset3
175135599191,14cyclictest2090261-21taskset3
175135599191,14cyclictest0-21swapper/33
175135599191,14cyclictest0-21swapper/33
175135599191,14cyclictest0-21swapper/33
175135599191,14cyclictest0-21swapper/33
175135599190,16cyclictest0-21swapper/33
213415921810,5sleep21882179-21diskmemload2
175135599184,2cyclictest0-21swapper/33
1751355991816,1cyclictest0-21swapper/33
1751355991812,4cyclictest0-21swapper/33
175135599181,14cyclictest2195376-21taskset3
175135599181,14cyclictest0-21swapper/33
175135599181,14cyclictest0-21swapper/33
175135599181,14cyclictest0-21swapper/33
175135599181,14cyclictest0-21swapper/33
175135599181,14cyclictest0-21swapper/33
175135599181,14cyclictest0-21swapper/33
175135599181,14cyclictest0-21swapper/33
175135599181,14cyclictest0-21swapper/33
175135599181,13cyclictest0-21swapper/33
175135599181,13cyclictest0-21swapper/33
175135599181,12cyclictest0-21swapper/33
175135599181,12cyclictest0-21swapper/33
175135599180,14cyclictest66950irq/132-enp1s0-TxRx-33
175135599180,14cyclictest66950irq/132-enp1s0-TxRx-33
21265892171,3sleep10-21swapper/11
21263832171,3sleep00-21swapper/00
20559032170,2sleep20-21swapper/22
175135599178,6cyclictest1866175-21turbostat3
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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