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2026-05-23 - 09:01

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 Sat May 23, 2026 00:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3622094211755,57sleep30-21swapper/33
362206828353,10sleep20-21swapper/22
362203127961,12sleep10-21swapper/11
362228327652,7sleep00-21swapper/00
36985722290,2sleep20-21swapper/22
37726752221,7sleep03774379-21tr0
362245399221,17cyclictest3954113-21taskset3
39108322211,16sleep03752806-21diskmemload0
362245399211,16cyclictest66950irq/132-enp1s0-TxRx-33
362245399211,16cyclictest4041435-21taskset3
362245399211,16cyclictest4041435-21taskset3
362245399211,16cyclictest3832134-21taskset3
362245399211,16cyclictest0-21swapper/33
362245399211,16cyclictest0-21swapper/33
362245399201,6cyclictest3767160-21taskset3
362245399201,16cyclictest0-21swapper/33
362245399201,15cyclictest0-21swapper/33
362245399201,15cyclictest0-21swapper/33
362245399201,13cyclictest0-21swapper/33
362245399198,8cyclictest3876601-21sleep3
362245399194,2cyclictest4017203-21taskset3
3622453991915,2cyclictest0-21swapper/33
3622453991914,2cyclictest66950irq/132-enp1s0-TxRx-33
362245399191,15cyclictest0-21swapper/33
362245399191,14cyclictest3793927-21chrt3
3622453991911,4cyclictest0-21swapper/33
362245399191,14cyclictest0-21swapper/33
362245399191,14cyclictest0-21swapper/33
362245399191,14cyclictest0-21swapper/33
362245399191,14cyclictest0-21swapper/33
40392592180,6sleep2431ktimers/22
40392592180,6sleep2431ktimers/22
362245399184,12cyclictest0-21swapper/33
362245399181,5cyclictest0-21swapper/33
362245399181,5cyclictest0-21swapper/33
3622453991812,3cyclictest0-21swapper/33
3622453991811,4cyclictest66950irq/132-enp1s0-TxRx-33
362245399181,14cyclictest0-21swapper/33
362245399181,14cyclictest0-21swapper/33
362245399181,14cyclictest0-21swapper/33
362245399181,14cyclictest0-21swapper/33
362245399181,14cyclictest0-21swapper/33
362245399180,2cyclictest0-21swapper/33
362245399180,14cyclictest3890958-21taskset3
39525962171,12sleep13952608-21ssh1
362245399178,6cyclictest3779389-21turbostat3
3622453991713,2cyclictest0-21swapper/33
3622453991713,2cyclictest0-21swapper/33
3622453991712,3cyclictest0-21swapper/33
362245399171,14cyclictest66950irq/132-enp1s0-TxRx-33
362245399171,13cyclictest0-21swapper/33
362245399171,13cyclictest0-21swapper/33
362245399171,13cyclictest0-21swapper/33
362245399171,13cyclictest0-21swapper/33
362245399171,13cyclictest0-21swapper/33
362245399170,14cyclictest0-21swapper/33
362245399170,14cyclictest0-21swapper/33
362245399170,13cyclictest0-21swapper/33
41138222161,4sleep24113843-21apt-get2
40801342161,11sleep14081801-21kthreadcore1
40294352164,7sleep04030117-21sed0
39952362160,4sleep13995304-21ntpq1
38126942160,8sleep13752806-21diskmemload1
362245399161,12cyclictest0-21swapper/33
362245399160,13cyclictest0-21swapper/33
362245399160,12cyclictest0-21swapper/33
41110672151,2sleep00-21swapper/00
40703192150,3sleep00-21swapper/00
40166662151,2sleep20-21swapper/22
40057172150,7sleep03752806-21diskmemload0
39509042150,3sleep2421rcuc/22
38747502151,4sleep13874760-21ssh1
38018162151,2sleep00-21swapper/00
37533422152,7sleep13753493-21diskstats1
37300662156,5sleep03730203-21ntpq0
362245399154,8cyclictest0-21swapper/33
362245399151,9cyclictest3683440-21taskset3
3622453991512,2cyclictest0-21swapper/33
362245399151,12cyclictest0-21swapper/33
362245399151,11cyclictest0-21swapper/33
362245399150,13cyclictest0-21swapper/33
362245399150,13cyclictest0-21swapper/33
362245399150,12cyclictest0-21swapper/33
362245399150,12cyclictest0-21swapper/33
40955452140,2sleep10-21swapper/11
40951562141,6sleep20-21swapper/22
40509102141,8sleep03752806-21diskmemload0
39294212141,9sleep13929435-21ssh1
38217982141,4sleep13821810-21ssh1
38204542140,2sleep00-21swapper/00
38044522141,8sleep20-21swapper/22
37926962142,8sleep13792747-21ssh1
37689832141,3sleep03768995-21ssh0
362245399141,1cyclictest0-21swapper/33
3622453991411,1cyclictest0-21swapper/33
40956782131,8sleep04095691-21ssh0
39634172131,2sleep20-21swapper/22
38769712132,6sleep13876999-21apt-get1
38419122131,2sleep20-21swapper/22
38374372131,3sleep03837498-21ld0
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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