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2026-05-15 - 14:15

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 May 15, 2026 12:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
95992721380,3sleep1331ktimers/11
490889212959,65sleep30-21swapper/33
491013210892,10sleep10-21swapper/11
49101928555,12sleep20-21swapper/22
49113727858,14sleep00-21swapper/00
491325992523,1cyclictest0-21swapper/33
491325992422,1cyclictest0-21swapper/33
491325992422,1cyclictest0-21swapper/33
491325992417,4cyclictest66950irq/132-enp1s0-TxRx-33
491325992411,10cyclictest0-21swapper/33
9322862231,3sleep10-21swapper/11
49132599238,12cyclictest0-21swapper/33
491325992319,2cyclictest0-21swapper/33
49132599231,18cyclictest939691-21chrt3
491325992214,4cyclictest916748-21taskset3
9597582211,9sleep0959924-21apt-config0
49132599215,13cyclictest0-21swapper/33
491325992119,1cyclictest0-21swapper/33
491325992112,7cyclictest0-21swapper/33
49132599211,17cyclictest0-21swapper/33
49132599211,16cyclictest66950irq/132-enp1s0-TxRx-33
491325992018,1cyclictest0-21swapper/33
491325992018,1cyclictest0-21swapper/33
491325992018,1cyclictest0-21swapper/33
491325992018,1cyclictest0-21swapper/33
491325992017,1cyclictest0-21swapper/33
491325992017,1cyclictest0-21swapper/33
491325992017,1cyclictest0-21swapper/33
49132599201,6cyclictest8044042sleep33
491325992014,3cyclictest694907-21taskset3
49132599200,16cyclictest678032-21taskset3
8831612190,7sleep1321rcuc/11
7200422190,2sleep10-21swapper/11
7120392191,9sleep2712052-21ssh2
6897122192,5sleep1689741-21apt-get1
491325991917,1cyclictest0-21swapper/33
491325991917,1cyclictest0-21swapper/33
491325991916,2cyclictest0-21swapper/33
491325991916,1cyclictest0-21swapper/33
491325991916,1cyclictest0-21swapper/33
491325991916,1cyclictest0-21swapper/33
491325991914,2cyclictest0-21swapper/33
49132599191,15cyclictest66950irq/132-enp1s0-TxRx-33
49132599191,14cyclictest737109-21taskset3
49132599191,14cyclictest66950irq/132-enp1s0-TxRx-33
491325991911,4cyclictest0-21swapper/33
49132599191,14cyclictest0-21swapper/33
9745952181,3sleep20-21swapper/22
5993132181,11sleep0599361-21ntpq0
49132599189,5cyclictest66950irq/132-enp1s0-TxRx-33
49132599182,14cyclictest66950irq/132-enp1s0-TxRx-33
491325991816,1cyclictest0-21swapper/33
491325991816,1cyclictest0-21swapper/33
491325991816,1cyclictest0-21swapper/33
491325991814,2cyclictest0-21swapper/33
491325991813,2cyclictest0-21swapper/33
49132599181,14cyclictest0-21swapper/33
49132599181,13cyclictest0-21swapper/33
49132599180,15cyclictest0-21swapper/33
8728312171,10sleep0621658-21diskmemload0
8649472171,4sleep0621658-21diskmemload0
8326382171,3sleep10-21swapper/11
7792312171,5sleep2431ktimers/22
6949492171,3sleep20-21swapper/22
5153802176,7sleep0516453-21tr0
49132599174,1cyclictest0-21swapper/33
491325991715,1cyclictest0-21swapper/33
491325991714,1cyclictest0-21swapper/33
491325991714,1cyclictest0-21swapper/33
491325991713,2cyclictest0-21swapper/33
49132599171,13cyclictest0-21swapper/33
49132599170,13cyclictest0-21swapper/33
8974122161,3sleep10-21swapper/11
8458992161,5sleep2845957-21ntp_kernel_pll_2
8241882160,6sleep00-21swapper/00
7825342160,7sleep10-21swapper/11
7115782161,2sleep00-21swapper/00
6900272161,4sleep0690242-21hddtemp_smartct0
6273922161,3sleep00-21swapper/00
60539321610,4sleep2520726-21kworker/2:0+events_freezable2
491325991614,1cyclictest0-21swapper/33
491325991614,1cyclictest0-21swapper/33
491325991614,1cyclictest0-21swapper/33
49132599161,3cyclictest0-21swapper/33
491325991613,1cyclictest0-21swapper/33
491325991613,1cyclictest0-21swapper/33
49132599161,13cyclictest0-21swapper/33
49132599161,12cyclictest0-21swapper/33
9499952150,1sleep10-21swapper/11
9420242150,1sleep20-21swapper/22
9230122150,3sleep10-21swapper/11
8882612152,7sleep0888312-21ntpq0
8230632151,11sleep1823073-21rm1
7732702152,2sleep1171rcu_preempt1
7316692151,7sleep1731897-21df_inode1
6616032151,10sleep0661617-21ssh0
6483882151,7sleep00-21swapper/00
5727282151,5sleep2572783-21ntpq2
491325991512,1cyclictest0-21swapper/33
49132599151,12cyclictest0-21swapper/33
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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