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2026-04-20 - 01:57

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 Mon Apr 20, 2026 00:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1136935212160,54sleep30-21swapper/33
113704328064,10sleep10-21swapper/11
113708427858,14sleep00-21swapper/00
113699627849,9sleep20-21swapper/22
113741299251,11cyclictest1602143-21chrt3
113741299251,11cyclictest1602143-21chrt3
13958692221,15sleep01396081-21users0
113741299222,16cyclictest1337097-21taskset3
1137412992215,4cyclictest1572902-21taskset3
1137412992213,5cyclictest66950irq/132-enp1s0-TxRx-33
113741299221,17cyclictest1293663-21taskset3
113741299220,18cyclictest1203759-21taskset3
113741299211,16cyclictest1527775-21taskset3
113741299211,16cyclictest1407294-21taskset3
113741299210,18cyclictest0-21swapper/33
113741299210,17cyclictest1282608-21taskset3
15128282201,9sleep11268380-21diskmemload1
14939532201,4sleep11493966-21sh1
1137412992012,5cyclictest66950irq/132-enp1s0-TxRx-33
1137412992012,5cyclictest0-21swapper/33
113741299201,15cyclictest66950irq/132-enp1s0-TxRx-33
113741299201,15cyclictest0-21swapper/33
113741299201,15cyclictest0-21swapper/33
113741299201,14cyclictest0-21swapper/33
113741299200,12cyclictest0-21swapper/33
12778442191,4sleep01277969-21perl0
11419832191,7sleep01142145-21sed0
1137412991916,1cyclictest0-21swapper/33
113741299191,15cyclictest0-21swapper/33
113741299191,15cyclictest0-21swapper/33
113741299191,14cyclictest66950irq/132-enp1s0-TxRx-33
113741299191,14cyclictest0-21swapper/33
113741299191,14cyclictest0-21swapper/33
113741299191,14cyclictest0-21swapper/33
13873332181,3sleep20-21swapper/22
113741299184,12cyclictest0-21swapper/33
1137412991811,5cyclictest66950irq/132-enp1s0-TxRx-33
113741299181,14cyclictest0-21swapper/33
113741299181,14cyclictest0-21swapper/33
113741299181,14cyclictest0-21swapper/33
113741299181,14cyclictest0-21swapper/33
113741299181,14cyclictest0-21swapper/33
113741299181,14cyclictest0-21swapper/33
113741299181,14cyclictest0-21swapper/33
113741299181,13cyclictest0-21swapper/33
113741299181,13cyclictest0-21swapper/33
113741299181,13cyclictest0-21swapper/33
113741299181,13cyclictest0-21swapper/33
113741299181,13cyclictest0-21swapper/33
113741299181,13cyclictest0-21swapper/33
15647282171,4sleep11-21systemd1
14620032171,11sleep01462428-21cut0
14151972171,12sleep21268380-21diskmemload2
12341772171,5sleep11235268-21memory1
1137412991713,2cyclictest0-21swapper/33
1137412991713,2cyclictest0-21swapper/33
1137412991711,4cyclictest0-21swapper/33
113741299171,14cyclictest0-21swapper/33
113741299170,14cyclictest0-21swapper/33
113741299170,14cyclictest0-21swapper/33
113741299170,13cyclictest0-21swapper/33
113741299170,13cyclictest0-21swapper/33
113741299170,13cyclictest0-21swapper/33
16269212160,1sleep20-21swapper/22
16012692161,2sleep00-21swapper/00
13627792161,9sleep20-21swapper/22
13302072162,10sleep21330341-21/usr/sbin/munin2
13020372161,3sleep20-21swapper/22
113741299161,11cyclictest1149917-21taskset3
1137412991610,3cyclictest0-21swapper/33
113741299160,13cyclictest0-21swapper/33
113741299160,13cyclictest0-21swapper/33
113741299160,13cyclictest0-21swapper/33
113741299160,13cyclictest0-21swapper/33
113741299160,13cyclictest0-21swapper/33
113741299160,12cyclictest0-21swapper/33
15997582150,1sleep10-21swapper/11
15988072151,2sleep20-21swapper/22
15839252151,8sleep01583983-21munin-run0
15482372151,10sleep21548251-21ssh2
13894382151,4sleep11268380-21diskmemload1
13100412150,1sleep10-21swapper/11
13093582150,1sleep00-21swapper/00
12703642158,4sleep10-21swapper/11
113741299150,13cyclictest0-21swapper/33
113741299150,13cyclictest0-21swapper/33
113741299150,12cyclictest0-21swapper/33
113741299150,12cyclictest0-21swapper/33
15571022141,9sleep11268380-21diskmemload1
15197092141,8sleep11268380-21diskmemload1
15032392141,2sleep20-21swapper/22
14253792141,4sleep11425390-21ssh1
12950052141,7sleep11295030-21ssh1
12837062140,1sleep10-21swapper/11
12763452141,8sleep01268380-21diskmemload0
12742132140,3sleep20-21swapper/22
113741299148,3cyclictest0-21swapper/33
1137412991411,2cyclictest0-21swapper/33
113741299140,2cyclictest0-21swapper/33
113741299140,12cyclictest0-21swapper/33
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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