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2026-05-03 - 00:41

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 Sat May 02, 2026 12:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3351016211961,54sleep30-21swapper/33
335088528061,12sleep10-21swapper/11
335092727860,12sleep20-21swapper/22
335089927253,14sleep00-21swapper/00
3351228992417,5cyclictest66950irq/132-enp1s0-TxRx-33
335122899221,18cyclictest0-21swapper/33
37757842211,14sleep13775840-21ntpq1
37261832211,8sleep03726196-21ssh0
335122899211,7cyclictest3694311-21taskset3
335122899211,16cyclictest66950irq/132-enp1s0-TxRx-33
3351228992110,8cyclictest3582369-21chrt3
335122899201,15cyclictest0-21swapper/33
335122899201,14cyclictest0-21swapper/33
335122899200,6cyclictest36329322sleep33
335122899200,17cyclictest66950irq/132-enp1s0-TxRx-33
335122899200,17cyclictest0-21swapper/33
38307352190,1sleep10-21swapper/11
38125902191,15sleep23481786-21diskmemload2
38099802191,6sleep13481786-21diskmemload1
37353272191,2sleep00-21swapper/00
3351228991916,2cyclictest0-21swapper/33
3351228991916,2cyclictest0-21swapper/33
335122899191,15cyclictest66950irq/132-enp1s0-TxRx-33
335122899191,14cyclictest0-21swapper/33
335122899191,14cyclictest0-21swapper/33
335122899191,14cyclictest0-21swapper/33
335122899191,14cyclictest0-21swapper/33
335122899191,14cyclictest0-21swapper/33
335122899190,8cyclictest3608435-21taskset3
38283262181,8sleep23828337-21ssh2
37009112180,8sleep03481786-21diskmemload0
34902492181,13sleep13490398-21sort1
335122899189,6cyclictest3658469-21taskset3
335122899189,6cyclictest3658469-21taskset3
3351228991815,1cyclictest0-21swapper/33
335122899181,4cyclictest3751653-21taskset3
335122899181,4cyclictest3751653-21taskset3
335122899181,14cyclictest33957852chrt3
335122899181,14cyclictest0-21swapper/33
335122899181,14cyclictest0-21swapper/33
335122899181,14cyclictest0-21swapper/33
335122899181,14cyclictest0-21swapper/33
335122899181,14cyclictest0-21swapper/33
335122899181,14cyclictest0-21swapper/33
335122899181,14cyclictest0-21swapper/33
335122899181,14cyclictest0-21swapper/33
335122899181,14cyclictest0-21swapper/33
335122899181,13cyclictest0-21swapper/33
335122899180,15cyclictest0-21swapper/33
335122899180,15cyclictest0-21swapper/33
36678992171,3sleep10-21swapper/11
36247352171,3sleep00-21swapper/00
35427152171,8sleep13542800-21uname1
3351228991713,2cyclictest0-21swapper/33
335122899171,14cyclictest0-21swapper/33
335122899171,14cyclictest0-21swapper/33
335122899171,14cyclictest0-21swapper/33
335122899171,13cyclictest0-21swapper/33
335122899171,13cyclictest0-21swapper/33
335122899171,13cyclictest0-21swapper/33
335122899171,13cyclictest0-21swapper/33
335122899171,12cyclictest0-21swapper/33
335122899170,14cyclictest0-21swapper/33
335122899170,14cyclictest0-21swapper/33
335122899170,14cyclictest0-21swapper/33
38113862161,2sleep00-21swapper/00
37516612161,2sleep00-21swapper/00
37516612161,2sleep00-21swapper/00
36596752161,3sleep10-21swapper/11
36596752161,3sleep10-21swapper/11
36543182161,4sleep03655929-21ssh0
36543182161,4sleep03655929-21ssh0
36355802160,2sleep03635593-21ssh0
335122899161,3cyclictest0-21swapper/33
3351228991613,1cyclictest0-21swapper/33
335122899161,13cyclictest0-21swapper/33
335122899161,13cyclictest0-21swapper/33
335122899161,12cyclictest0-21swapper/33
335122899160,14cyclictest0-21swapper/33
335122899160,13cyclictest0-21swapper/33
335122899160,13cyclictest0-21swapper/33
38037502151,9sleep03803760-21ssh0
38013882151,4sleep13801449-21ntpq1
37603502150,2sleep20-21swapper/22
36914642151,4sleep03691528-21ntpq0
36455142151,10sleep23646072-21cut2
35995372151,4sleep13481786-21diskmemload1
35135942151,4sleep23481786-21diskmemload2
34663762150,1sleep30-21swapper/33
335122899150,13cyclictest0-21swapper/33
335122899150,13cyclictest0-21swapper/33
335122899150,13cyclictest0-21swapper/33
335122899150,12cyclictest0-21swapper/33
335122899150,12cyclictest0-21swapper/33
335122899150,12cyclictest0-21swapper/33
335122899150,12cyclictest0-21swapper/33
335122899150,12cyclictest0-21swapper/33
335122899150,12cyclictest0-21swapper/33
335122899150,12cyclictest0-21swapper/33
38212652140,2sleep10-21swapper/11
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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