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2026-04-02 - 15:40

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 100 highest latencies:
System rack3slot3s.osadl.org (updated Thu Apr 02, 2026 12:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3288964212361,58sleep30-21swapper/33
328904029059,12sleep20-21swapper/22
328448928553,6sleep00-21swapper/00
328875828352,12sleep10-21swapper/11
3289185992212,5cyclictest35572032sleep33
3289185992210,9cyclictest3459958-21chrt3
35215852211,9sleep23521595-21ssh2
3289185992117,2cyclictest0-21swapper/33
328918599211,2cyclictest0-21swapper/33
328918599211,16cyclictest3548903-21taskset3
3289185992110,7cyclictest3661942-21taskset3
328918599201,16cyclictest3487277-21chrt3
328918599201,15cyclictest66950irq/132-enp1s0-TxRx-33
3289185992010,7cyclictest0-21swapper/33
328918599200,17cyclictest0-21swapper/33
33600122190,4sleep03360016-21latency_hist0
3289185991915,2cyclictest0-21swapper/33
328918599191,3cyclictest0-21swapper/33
328918599191,3cyclictest0-21swapper/33
328918599191,15cyclictest3506160-21chrt3
328918599191,15cyclictest3477461-21taskset3
328918599191,15cyclictest0-21swapper/33
328918599191,15cyclictest0-21swapper/33
328918599191,14cyclictest66950irq/132-enp1s0-TxRx-33
328918599191,14cyclictest0-21swapper/33
328918599191,14cyclictest0-21swapper/33
328918599191,14cyclictest0-21swapper/33
37482962181,11sleep13748352-21ntpq1
37271912181,13sleep23726602-21/usr/sbin/munin2
36910602181,9sleep03691067-21ssh0
36517572181,3sleep00-21swapper/00
36351652181,4sleep00-21swapper/00
3289185991814,2cyclictest0-21swapper/33
3289185991814,2cyclictest0-21swapper/33
3289185991814,2cyclictest0-21swapper/33
328918599181,14cyclictest0-21swapper/33
328918599181,14cyclictest0-21swapper/33
328918599181,14cyclictest0-21swapper/33
328918599181,14cyclictest0-21swapper/33
328918599181,14cyclictest0-21swapper/33
328918599181,14cyclictest0-21swapper/33
328918599181,13cyclictest0-21swapper/33
328918599181,13cyclictest0-21swapper/33
328918599181,13cyclictest0-21swapper/33
328918599181,13cyclictest0-21swapper/33
328918599181,13cyclictest0-21swapper/33
328918599181,13cyclictest0-21swapper/33
328918599181,13cyclictest0-21swapper/33
37413102171,3sleep00-21swapper/00
36089802171,2sleep10-21swapper/11
36079742171,3sleep00-21swapper/00
33494172171,4sleep03349436-21apt-get0
328918599171,14cyclictest0-21swapper/33
328918599171,13cyclictest0-21swapper/33
328918599171,13cyclictest0-21swapper/33
328918599171,13cyclictest0-21swapper/33
328918599171,13cyclictest0-21swapper/33
328918599171,12cyclictest0-21swapper/33
328918599170,14cyclictest0-21swapper/33
328918599170,13cyclictest0-21swapper/33
37141982161,3sleep00-21swapper/00
34962472160,5sleep13496258-21ssh1
34679432161,2sleep10-21swapper/11
33817202160,3sleep20-21swapper/22
32985622161,11sleep13299453-21kthreadcore1
328918599161,3cyclictest0-21swapper/33
3289185991611,2cyclictest0-21swapper/33
328918599161,12cyclictest0-21swapper/33
328918599160,13cyclictest0-21swapper/33
328918599160,13cyclictest0-21swapper/33
328918599160,13cyclictest0-21swapper/33
328918599160,12cyclictest0-21swapper/33
37288082150,4sleep0221rcuc/00
36878272151,2sleep10-21swapper/11
35842182151,3sleep13392116-21diskmemload1
35649412151,9sleep23392116-21diskmemload2
35070042152,4sleep23507028-21apt-get2
34982672151,10sleep03498509-21cat0
34860332151,2sleep00-21swapper/00
34142292151,8sleep13414287-21ntpq1
34068462150,1sleep00-21swapper/00
3289185991511,2cyclictest0-21swapper/33
328918599151,12cyclictest0-21swapper/33
328918599151,12cyclictest0-21swapper/33
328918599151,12cyclictest0-21swapper/33
328918599151,11cyclictest32977332sleep33
3289185991510,3cyclictest0-21swapper/33
328918599150,13cyclictest0-21swapper/33
328918599150,12cyclictest0-21swapper/33
328918599150,12cyclictest0-21swapper/33
328918599150,12cyclictest0-21swapper/33
37570602143,5sleep03757119-21ntpq0
36370322141,8sleep13392116-21diskmemload1
35931272141,3sleep23593141-21ssh2
35237042140,2sleep00-21swapper/00
34505682141,8sleep23392116-21diskmemload2
34322102141,9sleep13432469-21grep1
33506842141,9sleep13352433-21grep1
328918599148,3cyclictest3370388-21chrt3
3289185991410,2cyclictest0-21swapper/33
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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