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2026-05-20 - 19:24

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 Wed May 20, 2026 12:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3930021217062,104sleep30-21swapper/33
39349092118110,5sleep10-21swapper/11
393481128050,11sleep20-21swapper/22
393468327657,14sleep00-21swapper/00
3935104992619,5cyclictest1602012sleep33
547372241,11sleep14065631-21diskmemload1
3935104992319,2cyclictest0-21swapper/33
3935104992319,2cyclictest0-21swapper/33
3935104992219,1cyclictest0-21swapper/33
3935104992218,2cyclictest0-21swapper/33
3935104992118,2cyclictest0-21swapper/33
3935104992118,1cyclictest0-21swapper/33
3935104992117,2cyclictest0-21swapper/33
393510499211,17cyclictest0-21swapper/33
393510499211,17cyclictest0-21swapper/33
393510499211,16cyclictest624592sleep33
393510499211,16cyclictest0-21swapper/33
393510499211,16cyclictest0-21swapper/33
41875082200,7sleep134-21ksoftirqd/11
393510499209,7cyclictest166753-21chrt3
393510499208,1cyclictest0-21swapper/33
393510499202,1cyclictest0-21swapper/33
393510499202,16cyclictest66950irq/132-enp1s0-TxRx-33
3935104992016,2cyclictest0-21swapper/33
3935104992011,6cyclictest66950irq/132-enp1s0-TxRx-33
393510499201,15cyclictest0-21swapper/33
3935104992010,6cyclictest0-21swapper/33
393510499194,2cyclictest0-21swapper/33
3935104991917,1cyclictest0-21swapper/33
3935104991917,1cyclictest0-21swapper/33
3935104991917,1cyclictest0-21swapper/33
3935104991915,2cyclictest0-21swapper/33
393510499191,15cyclictest0-21swapper/33
393510499191,15cyclictest0-21swapper/33
3935104991911,4cyclictest66950irq/132-enp1s0-TxRx-33
393510499191,14cyclictest0-21swapper/33
393510499191,14cyclictest0-21swapper/33
393510499191,14cyclictest0-21swapper/33
393510499191,14cyclictest0-21swapper/33
393510499190,16cyclictest0-21swapper/33
393510499190,15cyclictest0-21swapper/33
3935104991815,2cyclictest0-21swapper/33
3935104991815,1cyclictest0-21swapper/33
3935104991814,2cyclictest0-21swapper/33
3935104991813,2cyclictest0-21swapper/33
3935104991813,2cyclictest0-21swapper/33
393510499181,14cyclictest0-21swapper/33
393510499181,13cyclictest0-21swapper/33
393510499181,13cyclictest0-21swapper/33
368222181,4sleep00-21swapper/00
1244222180,8sleep04065631-21diskmemload0
795362171,2sleep20-21swapper/22
41520052171,3sleep00-21swapper/00
41429192171,4sleep14065631-21diskmemload1
41381532171,4sleep04139862-21kthreadcore0
40850132171,5sleep14086682-21cut1
393510499172,11cyclictest4065652-21turbostat3
3935104991715,1cyclictest0-21swapper/33
3935104991713,2cyclictest0-21swapper/33
3935104991712,2cyclictest0-21swapper/33
393510499171,13cyclictest0-21swapper/33
393510499170,14cyclictest0-21swapper/33
393510499170,13cyclictest0-21swapper/33
1360472171,5sleep2136882-21kthreadcore2
1092502171,11sleep1109284-21ssh1
1064962171,7sleep24065631-21diskmemload2
634882161,8sleep10-21swapper/11
41778932161,4sleep14065631-21diskmemload1
41077682161,2sleep20-21swapper/22
393510499169,4cyclictest3943214-21chrt3
393510499161,3cyclictest0-21swapper/33
3935104991613,1cyclictest0-21swapper/33
3935104991612,2cyclictest0-21swapper/33
393510499161,13cyclictest0-21swapper/33
393510499161,13cyclictest0-21swapper/33
393510499161,12cyclictest0-21swapper/33
393510499160,13cyclictest0-21swapper/33
393510499160,13cyclictest0-21swapper/33
393510499160,13cyclictest0-21swapper/33
2388692161,3sleep04065631-21diskmemload0
465582151,2sleep10-21swapper/11
41420252150,1sleep20-21swapper/22
41071822151,4sleep04107196-21ssh0
40964802151,4sleep00-21swapper/00
40735682151,4sleep14065631-21diskmemload1
393510499152,8cyclictest4033954-21taskset3
3935104991512,2cyclictest0-21swapper/33
3935104991512,1cyclictest0-21swapper/33
393510499151,10cyclictest4060311-21chrt3
393510499150,12cyclictest0-21swapper/33
393510499150,11cyclictest0-21swapper/33
2293742150,3sleep00-21swapper/00
204562150,1sleep10-21swapper/11
1618402151,9sleep14065631-21diskmemload1
1487342151,7sleep1148779-21ntpq1
1326062150,3sleep00-21swapper/00
971732140,2sleep20-21swapper/22
783302141,8sleep078397-21ntp_states0
532132140,3sleep04065631-21diskmemload0
40788842141,7sleep14078945-21ntpq1
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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