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2026-04-19 - 19:34

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 Sun Apr 19, 2026 12:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2031139212349,69sleep30-21swapper/33
222075821150,2sleep00-21swapper/00
203116428767,12sleep20-21swapper/22
203119628466,12sleep10-21swapper/11
203133427753,7sleep00-21swapper/00
203145699262,20cyclictest0-21swapper/33
203145699214,3cyclictest2431685-21taskset3
203145699211,13cyclictest0-21swapper/33
24156512201,8sleep02161400-21diskmemload0
2031456992016,2cyclictest0-21swapper/33
203145699201,15cyclictest2492567-21chrt3
203145699200,18cyclictest0-21swapper/33
203145699200,18cyclictest0-21swapper/33
203145699200,18cyclictest0-21swapper/33
23157562190,2sleep00-21swapper/00
22139272191,5sleep10-21swapper/11
203145699191,7cyclictest2520278-21taskset3
203145699191,7cyclictest0-21swapper/33
203145699191,6cyclictest66950irq/132-enp1s0-TxRx-33
203145699191,15cyclictest0-21swapper/33
203145699191,14cyclictest66950irq/132-enp1s0-TxRx-33
203145699191,14cyclictest0-21swapper/33
203145699191,14cyclictest0-21swapper/33
203145699191,14cyclictest0-21swapper/33
203145699191,14cyclictest0-21swapper/33
203145699191,14cyclictest0-21swapper/33
203145699191,14cyclictest0-21swapper/33
203145699191,14cyclictest0-21swapper/33
203145699191,14cyclictest0-21swapper/33
21684152181,12sleep12161400-21diskmemload1
203145699183,13cyclictest0-21swapper/33
203145699181,14cyclictest0-21swapper/33
203145699181,14cyclictest0-21swapper/33
203145699181,14cyclictest0-21swapper/33
203145699181,14cyclictest0-21swapper/33
203145699181,14cyclictest0-21swapper/33
203145699181,14cyclictest0-21swapper/33
203145699181,14cyclictest0-21swapper/33
203145699181,14cyclictest0-21swapper/33
203145699181,14cyclictest0-21swapper/33
203145699181,14cyclictest0-21swapper/33
203145699181,13cyclictest0-21swapper/33
203145699181,13cyclictest0-21swapper/33
203145699181,13cyclictest0-21swapper/33
203145699181,13cyclictest0-21swapper/33
203145699181,13cyclictest0-21swapper/33
203145699181,12cyclictest0-21swapper/33
203145699180,14cyclictest0-21swapper/33
23495892171,3sleep00-21swapper/00
22306702170,2sleep10-21swapper/11
22045902171,4sleep22161400-21diskmemload2
203145699171,14cyclictest0-21swapper/33
203145699171,14cyclictest0-21swapper/33
203145699171,13cyclictest0-21swapper/33
203145699171,13cyclictest0-21swapper/33
203145699171,13cyclictest0-21swapper/33
203145699170,14cyclictest66950irq/132-enp1s0-TxRx-33
203145699170,14cyclictest0-21swapper/33
203145699170,13cyclictest0-21swapper/33
25190462161,4sleep12161400-21diskmemload1
24765062161,7sleep22476516-21ssh2
23336502161,4sleep02161400-21diskmemload0
21866922161,6sleep12161400-21diskmemload1
21766802161,4sleep22161400-21diskmemload2
203145699161,13cyclictest0-21swapper/33
203145699161,12cyclictest0-21swapper/33
203145699160,14cyclictest0-21swapper/33
203145699160,13cyclictest0-21swapper/33
203145699160,13cyclictest0-21swapper/33
203145699160,13cyclictest0-21swapper/33
203145699160,13cyclictest0-21swapper/33
24505462151,3sleep20-21swapper/22
24242942157,4sleep12424307-21sh1
23702462151,2sleep00-21swapper/00
23702462151,2sleep00-21swapper/00
23194732151,4sleep02319487-21ssh0
22916672151,9sleep12161400-21diskmemload1
21780292151,4sleep02178041-21ssh0
203145699158,4cyclictest2108093-21chrt3
203145699158,4cyclictest2108093-21chrt3
203145699151,8cyclictest20443632sleep33
203145699151,2cyclictest0-21swapper/33
2031456991512,2cyclictest0-21swapper/33
203145699150,13cyclictest0-21swapper/33
203145699150,13cyclictest0-21swapper/33
203145699150,12cyclictest0-21swapper/33
203145699150,12cyclictest0-21swapper/33
24919032141,5sleep22491910-21sh2
24790832140,2sleep014-21ksoftirqd/00
24225472141,2sleep20-21swapper/22
23794122141,2sleep20-21swapper/22
23695992141,8sleep12161400-21diskmemload1
23695992141,8sleep12161400-21diskmemload1
23625522141,7sleep072-21kcompactd00
23237422141,7sleep22323801-21ntpq2
23085922140,2sleep10-21swapper/11
22944712141,8sleep02296100-21cut0
22135622141,3sleep02213574-21ssh0
21945272141,2sleep20-21swapper/22
21700412140,2sleep20-21swapper/22
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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