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2026-05-03 - 19:09

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 Sun May 03, 2026 12:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
177987121320,2sleep10-21swapper/11
1530122211759,54sleep30-21swapper/33
152969128156,16sleep00-21swapper/00
153015628049,11sleep20-21swapper/22
152518728050,11sleep10-21swapper/11
16617132250,11sleep014-21ksoftirqd/00
1530685992519,2cyclictest0-21swapper/33
153068599241,20cyclictest0-21swapper/33
153068599231,3cyclictest0-21swapper/33
153068599231,3cyclictest0-21swapper/33
1530685992220,1cyclictest0-21swapper/33
153068599221,3cyclictest0-21swapper/33
153068599221,17cyclictest66950irq/132-enp1s0-TxRx-33
153068599211,15cyclictest0-21swapper/33
153068599201,8cyclictest1998861-21chrt3
1530685992015,2cyclictest0-21swapper/33
1530685992015,2cyclictest0-21swapper/33
153068599201,3cyclictest0-21swapper/33
1530685992012,6cyclictest0-21swapper/33
1530685992012,5cyclictest0-21swapper/33
1530685992011,6cyclictest1728129-21taskset3
153068599200,16cyclictest66950irq/132-enp1s0-TxRx-33
153068599193,13cyclictest0-21swapper/33
1530685991916,1cyclictest0-21swapper/33
1530685991915,2cyclictest0-21swapper/33
1530685991912,5cyclictest0-21swapper/33
153068599191,15cyclictest0-21swapper/33
153068599191,15cyclictest0-21swapper/33
153068599191,14cyclictest0-21swapper/33
153068599191,14cyclictest0-21swapper/33
153068599190,2cyclictest0-21swapper/33
153068599190,15cyclictest0-21swapper/33
18053662181,3sleep10-21swapper/11
153068599189,6cyclictest1634580-21taskset3
153068599187,7cyclictest1837119-21taskset3
153068599182,11cyclictest1581227-21taskset3
153068599182,11cyclictest1581227-21taskset3
153068599181,4cyclictest1634205-21chrt3
1530685991812,3cyclictest0-21swapper/33
153068599181,15cyclictest0-21swapper/33
153068599181,14cyclictest0-21swapper/33
153068599181,14cyclictest0-21swapper/33
153068599181,14cyclictest0-21swapper/33
153068599181,14cyclictest0-21swapper/33
153068599181,14cyclictest0-21swapper/33
153068599181,14cyclictest0-21swapper/33
153068599181,13cyclictest0-21swapper/33
153068599181,13cyclictest0-21swapper/33
153068599181,13cyclictest0-21swapper/33
153068599181,12cyclictest1861773-21chrt3
153068599180,16cyclictest0-21swapper/33
153068599180,15cyclictest0-21swapper/33
17171682171,9sleep11717227-21ntpq1
15781502170,4sleep0221rcuc/00
153068599179,4cyclictest1625426-21taskset3
153068599176,8cyclictest1644964-21turbostat3
153068599171,4cyclictest0-21swapper/33
1530685991713,2cyclictest0-21swapper/33
153068599171,13cyclictest0-21swapper/33
153068599171,13cyclictest0-21swapper/33
1530685991710,4cyclictest0-21swapper/33
153068599170,14cyclictest0-21swapper/33
153068599170,14cyclictest0-21swapper/33
153068599170,14cyclictest0-21swapper/33
153068599170,13cyclictest0-21swapper/33
19917922164,2sleep2171rcu_preempt2
18813992160,1sleep10-21swapper/11
17598202161,4sleep01759878-21ntpq0
17097542161,3sleep20-21swapper/22
153068599161,14cyclictest0-21swapper/33
153068599161,12cyclictest0-21swapper/33
153068599160,13cyclictest0-21swapper/33
153068599160,13cyclictest0-21swapper/33
19741092150,1sleep10-21swapper/11
19555402151,2sleep00-21swapper/00
19484542151,3sleep20-21swapper/22
18998992151,4sleep01899925-21apt-get0
18703542151,4sleep01661240-21diskmemload0
18218292150,11sleep11821843-21ssh1
18134082151,7sleep20-21swapper/22
16766842151,2sleep10-21swapper/11
15602262152,9sleep11561231-21kthreadcore1
153068599159,4cyclictest0-21swapper/33
1530685991511,2cyclictest0-21swapper/33
153068599150,13cyclictest0-21swapper/33
153068599150,12cyclictest0-21swapper/33
153068599150,12cyclictest0-21swapper/33
20071182141,3sleep21661240-21diskmemload2
19503552141,4sleep11950369-21ssh1
19470062141,4sleep11947019-21ssh1
16840702141,9sleep11684084-21ssh1
16621462141,8sleep21662224-21irqstats2
16333032140,2sleep10-21swapper/11
15537572141,9sleep21553760-21sshd2
1530685991412,1cyclictest0-21swapper/33
1530685991412,1cyclictest0-21swapper/33
153068599140,2cyclictest0-21swapper/33
153068599140,12cyclictest0-21swapper/33
20063882131,3sleep11661240-21diskmemload1
19921632131,4sleep172-21kcompactd01
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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