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2026-10-01 - 17:01

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 Tue Sep 29, 2026 00:43:53)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
304154021500,4sleep23041534-21cc12
34749012760,2sleep10-21swapper/11
29782272631,53sleep30-21swapper/33
33070032470,5sleep2431ktimers/22
29874802284,15sleep22987489-21cc12
30239682262,9sleep23023979-21cc12
298950399260,18cyclictest0-21swapper/33
30893482253,17sleep13089376-21cc11
30737532251,8sleep13073785-21cc11
30196372251,8sleep13019640-21cc11
298950399250,16cyclictest0-21swapper/33
29833192252,8sleep12983122-21cc11
32282502241,3sleep00-21swapper/00
2989503992420,2cyclictest0-21swapper/33
2989503992418,3cyclictest3024103-21taskset3
2989503992414,6cyclictest0-21swapper/33
298950399240,5cyclictest0-21swapper/33
29853962241,16sleep02985422-21nm0
29965332231,16sleep22996542-21cc12
298950399233,16cyclictest0-21swapper/33
2989503992315,4cyclictest0-21swapper/33
298950399230,5cyclictest0-21swapper/33
298950399230,5cyclictest0-21swapper/33
32668002221,3sleep00-21swapper/00
32633872222,16sleep23265035-21latency2
30877332221,8sleep03087751-21cc10
30563602221,9sleep13056381-21cc11
30095112221,15sleep13009520-21cc11
29966662222,14sleep12996656-21cc11
298950399224,15cyclictest0-21swapper/33
298950399221,17cyclictest0-21swapper/33
298950399221,14cyclictest0-21swapper/33
298950399220,5cyclictest0-21swapper/33
298950399220,15cyclictest0-21swapper/33
30733282211,8sleep03073336-21cc10
30439742211,15sleep13043990-21nm1
30336612213,11sleep03033637-21cc10
30205772211,8sleep03020592-21cc10
298950399213,15cyclictest0-21swapper/33
298950399211,9cyclictest0-21swapper/33
2989503992115,4cyclictest0-21swapper/33
2989503992114,4cyclictest3359567-21taskset3
2989503992112,5cyclictest0-21swapper/33
298950399211,18cyclictest0-21swapper/33
298950399211,17cyclictest0-21swapper/33
298950399211,15cyclictest0-21swapper/33
30951122201,14sleep03095120-21cc10
30319312201,6sleep13031904-21cc11
298950399205,12cyclictest32016812sleep33
298950399203,13cyclictest0-21swapper/33
298950399203,13cyclictest0-21swapper/33
2989503992015,3cyclictest0-21swapper/33
2989503992014,4cyclictest66950irq/132-enp1s0-TxRx-33
2989503992014,4cyclictest66950irq/132-enp1s0-TxRx-33
2989503992014,4cyclictest0-21swapper/33
2989503992012,5cyclictest0-21swapper/33
298950399201,16cyclictest0-21swapper/33
298950399201,15cyclictest0-21swapper/33
298950399200,4cyclictest0-21swapper/33
298950399200,4cyclictest0-21swapper/33
298950399200,16cyclictest0-21swapper/33
298950399200,14cyclictest0-21swapper/33
298950399200,14cyclictest0-21swapper/33
30789662191,13sleep13079016-21cc11
30744542191,11sleep23074462-21cc12
30416722191,11sleep03041654-21cc10
30322322191,13sleep23032231-21cc12
30080722191,11sleep03008086-21cc10
29979832192,10sleep02997972-21cc10
298950399194,10cyclictest3277648-21taskset3
298950399193,13cyclictest0-21swapper/33
298950399192,14cyclictest0-21swapper/33
298950399192,13cyclictest0-21swapper/33
298950399191,15cyclictest0-21swapper/33
298950399191,15cyclictest0-21swapper/33
298950399191,14cyclictest0-21swapper/33
298950399191,14cyclictest0-21swapper/33
298950399191,14cyclictest0-21swapper/33
298950399190,2cyclictest0-21swapper/33
298950399190,1cyclictest0-21swapper/33
298950399190,17cyclictest0-21swapper/33
35256742181,3sleep03186555-21diskmemload0
33501052181,3sleep20-21swapper/22
32110852180,12sleep00-21swapper/00
30721932181,6sleep23072209-21cc12
30517962181,12sleep23051799-21cc12
298950399187,7cyclictest3451036-21turbostat3
298950399181,9cyclictest0-21swapper/33
298950399181,14cyclictest0-21swapper/33
298950399181,13cyclictest3176009-21turbostat3
298950399181,13cyclictest3154885-21turbostat3
298950399181,13cyclictest3128469-21turbostat3
298950399180,3cyclictest0-21swapper/33
298950399180,15cyclictest0-21swapper/33
298950399180,15cyclictest0-21swapper/33
35117782171,7sleep13513222-21grep1
35082412171,4sleep23502860-21sendmail-msp2
33914782171,3sleep00-21swapper/00
33774022172,11sleep13377415-21apt-get1
33774022172,11sleep13377415-21apt-get1
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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