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2026-04-26 - 19:30

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 Apr 26, 2026 12:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
206381922880,2sleep02063817-21ntp_states0
1867230211857,56sleep30-21swapper/33
186711928756,10sleep10-21swapper/11
186645028452,10sleep20-21swapper/22
186719427654,16sleep00-21swapper/00
21953252221,16sleep02195336-21sshd0
1867603992215,4cyclictest2322667-21taskset3
186760399221,17cyclictest1918525-21taskset3
186760399221,17cyclictest0-21swapper/33
186760399221,16cyclictest0-21swapper/33
186760399221,15cyclictest2300817-21chrt3
1867603992118,2cyclictest0-21swapper/33
186760399211,17cyclictest0-21swapper/33
22540022201,8sleep02254147-21/usr/sbin/munin0
20982502201,6sleep12098309-21ntpq1
1867603992017,1cyclictest0-21swapper/33
186760399201,16cyclictest66950irq/132-enp1s0-TxRx-33
186760399201,16cyclictest2021857-21taskset3
186760399201,15cyclictest66950irq/132-enp1s0-TxRx-33
186760399201,15cyclictest1952308-21taskset3
186760399200,17cyclictest66950irq/132-enp1s0-TxRx-33
186760399200,17cyclictest0-21swapper/33
186760399200,17cyclictest0-21swapper/33
19167032191,6sleep11916751-21ntpq1
1867603991915,2cyclictest0-21swapper/33
1867603991915,2cyclictest0-21swapper/33
186760399191,15cyclictest66950irq/132-enp1s0-TxRx-33
186760399191,14cyclictest2212015-21taskset3
186760399191,14cyclictest0-21swapper/33
186760399191,14cyclictest0-21swapper/33
186760399191,14cyclictest0-21swapper/33
186760399191,14cyclictest0-21swapper/33
22210842180,1sleep10-21swapper/11
20220492181,3sleep20-21swapper/22
19014472182,7sleep11901432-31find1
1867603991814,2cyclictest66950irq/132-enp1s0-TxRx-33
1867603991813,3cyclictest0-21swapper/33
1867603991813,3cyclictest0-21swapper/33
1867603991812,4cyclictest0-21swapper/33
1867603991811,4cyclictest2013393-21taskset3
186760399181,14cyclictest0-21swapper/33
186760399181,14cyclictest0-21swapper/33
186760399181,14cyclictest0-21swapper/33
186760399181,14cyclictest0-21swapper/33
186760399181,14cyclictest0-21swapper/33
186760399181,14cyclictest0-21swapper/33
186760399181,14cyclictest0-21swapper/33
186760399181,14cyclictest0-21swapper/33
186760399181,14cyclictest0-21swapper/33
186760399181,14cyclictest0-21swapper/33
186760399181,14cyclictest0-21swapper/33
186760399180,16cyclictest0-21swapper/33
186760399180,14cyclictest0-21swapper/33
186760399180,14cyclictest0-21swapper/33
186760399178,5cyclictest19486562sleep33
1867603991715,1cyclictest0-21swapper/33
1867603991711,5cyclictest0-21swapper/33
186760399171,13cyclictest0-21swapper/33
186760399171,13cyclictest0-21swapper/33
186760399171,12cyclictest1998442-21turbostat3
186760399170,14cyclictest0-21swapper/33
186760399170,13cyclictest0-21swapper/33
186760399170,13cyclictest0-21swapper/33
23076792161,5sleep11998436-21diskmemload1
22646472161,3sleep00-21swapper/00
21959252161,3sleep10-21swapper/11
21690372161,10sleep21998436-21diskmemload2
19233082161,3sleep20-21swapper/22
1867603991612,3cyclictest0-21swapper/33
1867603991611,3cyclictest0-21swapper/33
186760399161,13cyclictest0-21swapper/33
186760399160,13cyclictest0-21swapper/33
186760399160,13cyclictest0-21swapper/33
186760399160,12cyclictest0-21swapper/33
23495902150,2sleep20-21swapper/22
23495902150,2sleep20-21swapper/22
23348142151,4sleep12334844-21apt-get1
23348142151,4sleep12334844-21apt-get1
23232702151,4sleep21998436-21diskmemload2
22806272151,4sleep02280640-21ssh0
22650042151,3sleep21998436-21diskmemload2
22122662150,4sleep00-21swapper/00
21619972151,9sleep21998436-21diskmemload2
20981492151,8sleep02098247-21ntpq0
20730912151,2sleep10-21swapper/11
20671032151,3sleep11998436-21diskmemload1
20472272152,10sleep01998436-21diskmemload0
19757542151,9sleep11975802-21ntpq1
19232862151,4sleep11923305-21apt-get1
1867603991512,2cyclictest0-21swapper/33
1867603991511,2cyclictest0-21swapper/33
186760399151,12cyclictest0-21swapper/33
186760399150,13cyclictest0-21swapper/33
186760399150,12cyclictest0-21swapper/33
186760399150,12cyclictest0-21swapper/33
23496582141,8sleep01998436-21diskmemload0
23496582141,8sleep01998436-21diskmemload0
23278462141,4sleep12329377-21ssh1
23159882146,3sleep11998436-21diskmemload1
23065372141,2sleep00-21swapper/00
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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