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2026-04-09 - 01:54

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 Thu Apr 09, 2026 00:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
44747221640,1sleep290-21kswapd02
38558721310,2sleep20-21swapper/22
4153057212063,51sleep30-21swapper/33
415283428666,12sleep20-21swapper/22
415283328354,10sleep10-21swapper/11
415285627453,15sleep00-21swapper/00
1818992320,2sleep2431ktimers/22
4153230993019,3cyclictest0-21swapper/33
3591452301,7sleep2359211-21ntpq2
415323099241,19cyclictest31283-21taskset3
415323099231,6cyclictest0-21swapper/33
415323099231,18cyclictest0-21swapper/33
415323099231,12cyclictest0-21swapper/33
415323099221,2cyclictest0-21swapper/33
415323099221,18cyclictest0-21swapper/33
415323099221,17cyclictest0-21swapper/33
415323099221,15cyclictest0-21swapper/33
3281412221,17sleep00-21swapper/00
415323099212,8cyclictest0-21swapper/33
4153230992117,2cyclictest0-21swapper/33
415323099211,3cyclictest1875992sleep33
415323099211,2cyclictest2651312sleep33
415323099211,16cyclictest448589-21taskset3
415323099210,18cyclictest0-21swapper/33
415323099210,12cyclictest0-21swapper/33
3436022211,5sleep290194-21diskmemload2
415323099203,7cyclictest0-21swapper/33
415323099203,7cyclictest0-21swapper/33
415323099203,7cyclictest0-21swapper/33
415323099202,8cyclictest0-21swapper/33
415323099202,7cyclictest0-21swapper/33
415323099201,8cyclictest90206-21turbostat3
4153230992018,1cyclictest0-21swapper/33
415323099201,16cyclictest0-21swapper/33
415323099201,15cyclictest66950irq/132-enp1s0-TxRx-33
415323099201,15cyclictest432248-21taskset3
415323099201,15cyclictest0-21swapper/33
415323099200,3cyclictest150792sleep33
415323099200,2cyclictest2557692sleep33
415323099200,16cyclictest1423782sleep33
415323099200,12cyclictest0-21swapper/33
3533962202,7sleep190194-21diskmemload1
415323099197,2cyclictest0-21swapper/33
415323099193,7cyclictest0-21swapper/33
4153230991913,3cyclictest0-21swapper/33
4153230991912,4cyclictest0-21swapper/33
415323099191,15cyclictest0-21swapper/33
415323099191,15cyclictest0-21swapper/33
415323099191,15cyclictest0-21swapper/33
415323099191,15cyclictest0-21swapper/33
415323099191,14cyclictest0-21swapper/33
415323099191,14cyclictest0-21swapper/33
415323099191,14cyclictest0-21swapper/33
415323099191,14cyclictest0-21swapper/33
415323099191,14cyclictest0-21swapper/33
415323099190,15cyclictest66950irq/132-enp1s0-TxRx-33
415323099188,1cyclictest0-21swapper/33
415323099181,14cyclictest0-21swapper/33
415323099181,13cyclictest0-21swapper/33
415323099180,3cyclictest41712672sleep33
415323099180,14cyclictest41818202sleep33
4138812181,2sleep20-21swapper/22
415323099171,13cyclictest0-21swapper/33
415323099171,13cyclictest0-21swapper/33
415323099171,12cyclictest0-21swapper/33
415323099171,12cyclictest0-21swapper/33
415323099170,14cyclictest0-21swapper/33
415323099170,14cyclictest0-21swapper/33
2535312172,8sleep0253595-21ntpq0
415323099160,13cyclictest0-21swapper/33
415323099160,13cyclictest0-21swapper/33
3779532161,2sleep10-21swapper/11
3698142161,2sleep00-21swapper/00
3610342161,4sleep0361036-21ssh0
942932151,9sleep194629-21/usr/sbin/munin1
518892151,8sleep251938-21ntpq2
4252402151,3sleep290194-21diskmemload2
415323099157,4cyclictest74487-21taskset3
4153230991512,2cyclictest0-21swapper/33
415323099151,11cyclictest96332sleep33
415323099150,13cyclictest0-21swapper/33
415323099150,12cyclictest0-21swapper/33
415323099150,11cyclictest0-21swapper/33
2893122150,2sleep10-21swapper/11
2581312151,6sleep00-21swapper/00
1919562151,5sleep090194-21diskmemload0
1580802151,10sleep2158095-21ssh2
1161412150,2sleep00-21swapper/00
4572322141,3sleep190194-21diskmemload1
415323099144,7cyclictest69962-21taskset3
415323099140,11cyclictest0-21swapper/33
4141892141,1sleep10-21swapper/11
3264112141,7sleep190194-21diskmemload1
2463222141,8sleep190194-21diskmemload1
2460372141,7sleep290194-21diskmemload2
2124652141,2sleep00-21swapper/00
1938292141,9sleep1193843-21ssh1
1867982140,3sleep090194-21diskmemload0
892282130,6sleep089288-21ntp_offset0
641202131,8sleep164325-21sed1
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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