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2026-05-21 - 07:48

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 May 21, 2026 00:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3018543211756,56sleep30-21swapper/33
301850028670,10sleep10-21swapper/11
301356328556,7sleep00-21swapper/00
301840028353,11sleep20-21swapper/22
31817072241,19sleep03148826-21diskmemload0
3018787992112,6cyclictest0-21swapper/33
301878799211,16cyclictest3289889-21taskset3
301878799211,16cyclictest0-21swapper/33
30601642202,14sleep03061978-21tr0
3018787992017,1cyclictest0-21swapper/33
301878799201,16cyclictest3498699-21taskset3
301878799201,15cyclictest0-21swapper/33
301878799201,15cyclictest0-21swapper/33
301878799200,7cyclictest33652882sleep33
301878799200,17cyclictest0-21swapper/33
3018787991915,2cyclictest0-21swapper/33
301878799191,15cyclictest0-21swapper/33
301878799191,15cyclictest0-21swapper/33
301878799191,14cyclictest0-21swapper/33
301878799191,14cyclictest0-21swapper/33
301878799191,14cyclictest0-21swapper/33
301878799191,14cyclictest0-21swapper/33
301878799191,14cyclictest0-21swapper/33
301878799191,14cyclictest0-21swapper/33
301878799190,16cyclictest0-21swapper/33
32545572181,13sleep23254648-21date2
31104752181,13sleep23110520-21/usr/sbin/munin2
301878799187,8cyclictest3342192-21turbostat3
301878799187,8cyclictest3342192-21turbostat3
301878799181,14cyclictest66950irq/132-enp1s0-TxRx-33
301878799181,14cyclictest3173528-21taskset3
301878799181,14cyclictest31432952sleep33
301878799181,14cyclictest0-21swapper/33
301878799181,14cyclictest0-21swapper/33
301878799181,14cyclictest0-21swapper/33
301878799181,14cyclictest0-21swapper/33
301878799181,14cyclictest0-21swapper/33
301878799181,14cyclictest0-21swapper/33
301878799181,14cyclictest0-21swapper/33
301878799181,13cyclictest0-21swapper/33
301878799181,13cyclictest0-21swapper/33
301878799180,16cyclictest0-21swapper/33
301878799180,15cyclictest66950irq/132-enp1s0-TxRx-33
301878799180,15cyclictest0-21swapper/33
301878799180,15cyclictest0-21swapper/33
35164342170,6sleep20-21swapper/22
34305332171,4sleep03148826-21diskmemload0
31428952171,4sleep03143111-21users0
3018787991714,1cyclictest0-21swapper/33
3018787991712,2cyclictest0-21swapper/33
301878799171,14cyclictest0-21swapper/33
301878799171,14cyclictest0-21swapper/33
301878799171,13cyclictest0-21swapper/33
301878799171,12cyclictest0-21swapper/33
301878799170,14cyclictest0-21swapper/33
301878799170,14cyclictest0-21swapper/33
301878799170,13cyclictest0-21swapper/33
301878799170,13cyclictest0-21swapper/33
35007982161,2sleep00-21swapper/00
34222132160,5sleep23148826-21diskmemload2
34014362161,4sleep03148826-21diskmemload0
33929792160,2sleep00-21swapper/00
32636492161,2sleep10-21swapper/11
32440512161,2sleep00-21swapper/00
32327502161,4sleep03232811-21ntpq0
3018787991612,3cyclictest0-21swapper/33
301878799161,12cyclictest3127524-21sleep3
301878799160,13cyclictest0-21swapper/33
301878799160,13cyclictest0-21swapper/33
301878799160,13cyclictest0-21swapper/33
301878799160,13cyclictest0-21swapper/33
35099312151,3sleep13148826-21diskmemload1
34912982150,2sleep00-21swapper/00
33425782151,8sleep23342602-21apt-get2
33425782151,8sleep23342602-21apt-get2
33162092151,3sleep03148826-21diskmemload0
32968082150,1sleep20-21swapper/22
32562032151,7sleep23257857-21kthreadcore2
32367272151,3sleep20-21swapper/22
30838732151,9sleep23083919-21ntpq2
301878799151,12cyclictest0-21swapper/33
301878799151,12cyclictest0-21swapper/33
301878799151,10cyclictest3074189-21turbostat3
301878799150,13cyclictest0-21swapper/33
301878799150,13cyclictest0-21swapper/33
301878799150,12cyclictest0-21swapper/33
301878799150,12cyclictest0-21swapper/33
301878799150,12cyclictest0-21swapper/33
35019452143,7sleep03502185-21cat0
34015032141,2sleep20-21swapper/22
33949222141,3sleep13148826-21diskmemload1
33822052141,8sleep13382263-21ntpq1
32347772140,2sleep1321rcuc/11
32261642141,9sleep03148826-21diskmemload0
32105972141,6sleep03210656-21munin-run0
31889022141,7sleep03188959-21ntpq0
31659092141,2sleep20-21swapper/22
30953052140,1sleep20-21swapper/22
301878799149,3cyclictest0-21swapper/33
301878799140,2cyclictest0-21swapper/33
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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