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2026-08-07 - 17:28

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 Fri Aug 07, 2026 12:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
339452821270,1sleep03394526-21ssh0
3082418211960,54sleep30-21swapper/33
308235229363,12sleep20-21swapper/22
308245028455,9sleep10-21swapper/11
308265527656,14sleep00-21swapper/00
31074772330,2sleep30-21swapper/33
33080162240,2sleep2421rcuc/22
308283399221,18cyclictest0-21swapper/33
3082833992118,1cyclictest0-21swapper/33
308283399211,16cyclictest3142454-21taskset3
308283399211,16cyclictest0-21swapper/33
308283399208,8cyclictest3503332-21sleep3
308283399208,3cyclictest33142382sleep33
3082833992015,3cyclictest66950irq/132-enp1s0-TxRx-33
308283399201,15cyclictest0-21swapper/33
308283399201,15cyclictest0-21swapper/33
308283399201,14cyclictest0-21swapper/33
35132062191,14sleep03514261-21kthreadcore0
34656132191,3sleep03465627-21ssh0
308283399198,7cyclictest3458941-21turbostat3
308283399194,12cyclictest3291143-21chrt3
3082833991915,2cyclictest3579202-21taskset3
308283399191,15cyclictest0-21swapper/33
308283399191,15cyclictest0-21swapper/33
308283399191,14cyclictest66950irq/132-enp1s0-TxRx-33
308283399191,14cyclictest0-21swapper/33
308283399191,14cyclictest0-21swapper/33
308283399191,14cyclictest0-21swapper/33
308283399191,14cyclictest0-21swapper/33
308283399191,14cyclictest0-21swapper/33
308283399191,14cyclictest0-21swapper/33
34770542181,9sleep03476687-21sendmail-msp0
32700742181,2sleep10-21swapper/11
31589372181,7sleep13158609-21/usr/sbin/munin1
308283399181,5cyclictest66950irq/132-enp1s0-TxRx-33
3082833991815,1cyclictest0-21swapper/33
308283399181,14cyclictest0-21swapper/33
308283399181,14cyclictest0-21swapper/33
308283399181,14cyclictest0-21swapper/33
308283399181,14cyclictest0-21swapper/33
308283399181,14cyclictest0-21swapper/33
308283399181,14cyclictest0-21swapper/33
308283399181,14cyclictest0-21swapper/33
308283399181,13cyclictest0-21swapper/33
308283399181,13cyclictest0-21swapper/33
308283399181,13cyclictest0-21swapper/33
308283399181,13cyclictest0-21swapper/33
308283399180,16cyclictest0-21swapper/33
308283399180,15cyclictest0-21swapper/33
308283399180,15cyclictest0-21swapper/33
32878372171,3sleep20-21swapper/22
308283399172,10cyclictest3163925-21taskset3
308283399171,3cyclictest0-21swapper/33
308283399171,3cyclictest0-21swapper/33
3082833991712,3cyclictest0-21swapper/33
308283399171,13cyclictest0-21swapper/33
308283399171,13cyclictest0-21swapper/33
308283399171,13cyclictest0-21swapper/33
3082833991710,5cyclictest0-21swapper/33
308283399170,15cyclictest0-21swapper/33
308283399170,15cyclictest0-21swapper/33
308283399170,13cyclictest0-21swapper/33
34495462161,3sleep10-21swapper/11
32983292161,11sleep03298340-21ssh0
32436222161,11sleep03243636-21ssh0
32371942160,1sleep00-21swapper/00
308283399167,6cyclictest3179357-21turbostat3
308283399162,2cyclictest0-21swapper/33
308283399161,4cyclictest0-21swapper/33
308283399161,14cyclictest0-21swapper/33
308283399161,14cyclictest0-21swapper/33
3082833991611,3cyclictest0-21swapper/33
308283399161,12cyclictest0-21swapper/33
308283399161,12cyclictest0-21swapper/33
308283399160,13cyclictest0-21swapper/33
35636012151,2sleep00-21swapper/00
34566962151,3sleep03210939-21diskmemload0
34048192151,4sleep13210939-21diskmemload1
33059652151,2sleep00-21swapper/00
32694952150,2sleep20-21swapper/22
32280622151,2sleep10-21swapper/11
31431892151,10sleep03143256-21tune2fs0
308283399151,3cyclictest0-21swapper/33
308283399151,10cyclictest3142931-21chrt3
308283399151,10cyclictest0-21swapper/33
308283399150,13cyclictest0-21swapper/33
308283399150,12cyclictest0-21swapper/33
308283399150,12cyclictest0-21swapper/33
35257542141,8sleep13525919-21sed1
35197872141,9sleep23519800-21ssh2
35017822141,2sleep10-21swapper/11
34834322140,2sleep10-21swapper/11
33904462141,2sleep10-21swapper/11
33506592141,2sleep10-21swapper/11
32994832141,5sleep23299496-21ssh2
32336202141,3sleep13210939-21diskmemload1
31895562140,2sleep00-21swapper/00
31166852141,9sleep03116862-21diskstats0
3082833991412,1cyclictest0-21swapper/33
308283399140,2cyclictest0-21swapper/33
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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