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2026-06-26 - 07:41

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 Fri Jun 26, 2026 00:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
36023421310,2sleep1301irq_work/11
250626212061,55sleep30-21swapper/33
25052928456,7sleep00-21swapper/00
25039728263,11sleep20-21swapper/22
25069827862,10sleep10-21swapper/11
6031102251,10sleep0378815-21diskmemload0
25100099221,17cyclictest698445-21taskset3
25100099221,17cyclictest394652-21taskset3
25100099215,13cyclictest66950irq/132-enp1s0-TxRx-33
251000992117,2cyclictest0-21swapper/33
25100099211,16cyclictest529525-21chrt3
4876272201,4sleep00-21swapper/00
251000992012,5cyclictest0-21swapper/33
25100099201,15cyclictest0-21swapper/33
25100099201,15cyclictest0-21swapper/33
25100099192,13cyclictest530572-21taskset3
25100099192,12cyclictest613876-21chrt3
251000991916,1cyclictest0-21swapper/33
25100099191,2cyclictest0-21swapper/33
25100099191,15cyclictest0-21swapper/33
25100099191,14cyclictest0-21swapper/33
25100099191,13cyclictest0-21swapper/33
6387982181,3sleep20-21swapper/22
5948682181,2sleep10-21swapper/11
3324172181,3sleep10-21swapper/11
25100099183,2cyclictest0-21swapper/33
25100099182,13cyclictest722382-21chrt3
25100099181,2cyclictest0-21swapper/33
25100099181,14cyclictest0-21swapper/33
25100099181,14cyclictest0-21swapper/33
25100099181,14cyclictest0-21swapper/33
25100099181,14cyclictest0-21swapper/33
25100099181,13cyclictest0-21swapper/33
6221212170,2sleep10-21swapper/11
6054752171,3sleep00-21swapper/00
5110352171,9sleep20-21swapper/22
4455762170,7sleep20-21swapper/22
4382112171,11sleep1438246-21ssh1
4378132170,13sleep10-21swapper/11
25100099174,1cyclictest0-21swapper/33
25100099172,10cyclictest547420-21taskset3
25100099172,10cyclictest395973-21taskset3
25100099172,10cyclictest269012-21taskset3
25100099171,7cyclictest677339-21taskset3
25100099171,4cyclictest66950irq/132-enp1s0-TxRx-33
251000991712,3cyclictest0-21swapper/33
25100099171,14cyclictest0-21swapper/33
25100099171,13cyclictest66950irq/132-enp1s0-TxRx-33
251000991711,3cyclictest0-21swapper/33
25100099171,13cyclictest0-21swapper/33
25100099171,13cyclictest0-21swapper/33
25100099171,13cyclictest0-21swapper/33
25100099171,13cyclictest0-21swapper/33
25100099171,13cyclictest0-21swapper/33
25100099171,13cyclictest0-21swapper/33
25100099171,13cyclictest0-21swapper/33
25100099171,13cyclictest0-21swapper/33
25100099170,1cyclictest0-21swapper/33
25100099170,14cyclictest0-21swapper/33
25100099170,14cyclictest0-21swapper/33
7136032161,5sleep2713614-21ssh2
6723272161,2sleep00-21swapper/00
6599062161,11sleep0660165-21grep0
6305212161,10sleep1630536-21ssh1
6204932160,3sleep10-21swapper/11
5937512161,3sleep0378815-21diskmemload0
5291842160,1sleep20-21swapper/22
5020532161,3sleep20-21swapper/22
4213972161,8sleep0421609-21diskstats0
25100099161,3cyclictest0-21swapper/33
25100099161,3cyclictest0-21swapper/33
25100099161,3cyclictest0-21swapper/33
251000991612,2cyclictest0-21swapper/33
251000991611,3cyclictest0-21swapper/33
251000991611,3cyclictest0-21swapper/33
25100099161,13cyclictest0-21swapper/33
25100099161,12cyclictest0-21swapper/33
7308722151,2sleep00-21swapper/00
6540652151,4sleep0654075-21ssh0
6444032151,3sleep0644413-21ssh0
6290832151,2sleep20-21swapper/22
5707792151,9sleep2570793-21ssh2
5623812151,4sleep2378815-21diskmemload2
5309052151,3sleep10-21swapper/11
3531522151,10sleep0353179-21cut0
25100099151,9cyclictest310961-21taskset3
25100099151,11cyclictest268748-21turbostat3
251000991510,3cyclictest0-21swapper/33
25100099150,3cyclictest0-21swapper/33
6880572141,9sleep1688067-21ssh1
6055352142,8sleep1605547-21apt-get1
6021982141,3sleep10-21swapper/11
5727252141,6sleep1572945-21hddtemp_smartct1
5710412141,8sleep0378815-21diskmemload0
5632832140,2sleep10-21swapper/11
5459542140,1sleep00-21swapper/00
5305572141,4sleep20-21swapper/22
5190512141,4sleep2519062-21ssh2
4694562141,2sleep20-21swapper/22
4099992141,9sleep0410012-21sh0
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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