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2026-03-28 - 11:09

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 Sat Mar 28, 2026 00:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
782997212953,72sleep30-21swapper/33
78778928354,14sleep00-21swapper/00
78769228172,6sleep10-21swapper/11
78778627760,11sleep20-21swapper/22
788152992813,12cyclictest0-21swapper/33
788152992723,2cyclictest0-21swapper/33
7883072261,12sleep2788326-21apt-get2
788152992321,1cyclictest0-21swapper/33
78815299231,18cyclictest0-21swapper/33
78815299224,14cyclictest1206078-21taskset3
78815299222,16cyclictest0-21swapper/33
788152992220,1cyclictest0-21swapper/33
788152992219,2cyclictest0-21swapper/33
78815299216,12cyclictest0-21swapper/33
78815299215,14cyclictest0-21swapper/33
78815299213,14cyclictest66950irq/132-enp1s0-TxRx-33
788152992119,1cyclictest0-21swapper/33
788152992119,1cyclictest0-21swapper/33
788152992119,1cyclictest0-21swapper/33
788152992119,1cyclictest0-21swapper/33
788152992118,2cyclictest0-21swapper/33
788152992118,1cyclictest0-21swapper/33
788152992118,1cyclictest0-21swapper/33
788152992117,2cyclictest0-21swapper/33
788152992111,7cyclictest995003-21taskset3
78815299211,16cyclictest0-21swapper/33
11917312210,2sleep20-21swapper/22
788152992018,1cyclictest0-21swapper/33
788152992018,1cyclictest0-21swapper/33
788152992017,1cyclictest0-21swapper/33
788152992017,1cyclictest0-21swapper/33
788152992017,1cyclictest0-21swapper/33
788152992016,2cyclictest0-21swapper/33
788152992016,2cyclictest0-21swapper/33
788152992016,2cyclictest0-21swapper/33
788152992016,2cyclictest0-21swapper/33
788152992016,2cyclictest0-21swapper/33
788152992016,2cyclictest0-21swapper/33
788152992013,3cyclictest1136760-21taskset3
78815299201,16cyclictest0-21swapper/33
78815299201,14cyclictest0-21swapper/33
788152991917,1cyclictest0-21swapper/33
788152991917,1cyclictest0-21swapper/33
788152991915,2cyclictest0-21swapper/33
788152991915,2cyclictest0-21swapper/33
788152991914,2cyclictest0-21swapper/33
788152991914,2cyclictest0-21swapper/33
788152991910,6cyclictest907933-21turbostat3
788152991910,6cyclictest907933-21turbostat3
10841592191,3sleep20-21swapper/22
9721542181,5sleep0972424-21df_inode0
788152991816,1cyclictest0-21swapper/33
788152991815,1cyclictest0-21swapper/33
788152991814,2cyclictest0-21swapper/33
788152991813,2cyclictest0-21swapper/33
788152991813,2cyclictest0-21swapper/33
10406712181,3sleep10-21swapper/11
9497682171,5sleep0949828-21ntpq0
8803292171,5sleep1880378-21ntpq1
788152991715,1cyclictest0-21swapper/33
788152991714,1cyclictest0-21swapper/33
788152991714,1cyclictest0-21swapper/33
788152991713,2cyclictest0-21swapper/33
788152991713,2cyclictest0-21swapper/33
788152991713,2cyclictest0-21swapper/33
788152991713,2cyclictest0-21swapper/33
788152991713,2cyclictest0-21swapper/33
788152991712,2cyclictest0-21swapper/33
788152991712,2cyclictest0-21swapper/33
78815299171,13cyclictest0-21swapper/33
78815299170,13cyclictest0-21swapper/33
12591272171,3sleep20-21swapper/22
12349202171,5sleep2918879-21diskmemload2
11464982171,6sleep1918879-21diskmemload1
11368352171,4sleep1918879-21diskmemload1
9938462161,11sleep0993911-21sh0
9879532160,2sleep20-21swapper/22
9545042160,3sleep1954509-21cut1
9357872161,3sleep10-21swapper/11
9073672161,10sleep2907552-21users2
9073672161,10sleep2907552-21users2
78815299163,2cyclictest0-21swapper/33
788152991614,1cyclictest0-21swapper/33
788152991614,1cyclictest0-21swapper/33
788152991613,1cyclictest0-21swapper/33
788152991613,1cyclictest0-21swapper/33
788152991613,1cyclictest0-21swapper/33
78815299160,13cyclictest0-21swapper/33
12684532161,9sleep2918879-21diskmemload2
11536362161,2sleep00-21swapper/00
11103552161,2sleep10-21swapper/11
10497262161,4sleep1918879-21diskmemload1
10491182161,2sleep20-21swapper/22
10400022161,11sleep01040013-21ssh0
9966122151,5sleep1996626-21ssh1
8176002150,3sleep20-21swapper/22
788152991513,1cyclictest0-21swapper/33
12872892151,9sleep2918879-21diskmemload2
12507152151,9sleep01250728-21ssh0
11028872151,3sleep1918879-21diskmemload1
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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