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2026-05-16 - 15:12

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 May 16, 2026 12:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
307310021230,5sleep03069523-21kworker/u16:1-writeback0
307310021230,5sleep03069523-21kworker/u16:1-writeback0
2846909212152,62sleep30-21swapper/33
284726528872,10sleep20-21swapper/22
284723928664,12sleep10-21swapper/11
284724328458,6sleep00-21swapper/00
284773499249,9cyclictest3004217-21taskset3
2847734992317,4cyclictest0-21swapper/33
33049342222,8sleep23305033-21ntpq2
2847734992118,2cyclictest0-21swapper/33
2847734992111,6cyclictest66950irq/132-enp1s0-TxRx-33
284773499211,16cyclictest3232960-21taskset3
284773499211,14cyclictest0-21swapper/33
31312252201,8sleep03131236-21ssh0
2847734992017,1cyclictest0-21swapper/33
284773499201,15cyclictest0-21swapper/33
284773499201,13cyclictest0-21swapper/33
32206712191,6sleep03220732-21ntpq0
284773499199,6cyclictest2881841-21turbostat3
284773499191,7cyclictest3209764-21taskset3
2847734991915,3cyclictest66950irq/132-enp1s0-TxRx-33
284773499191,2cyclictest0-21swapper/33
284773499191,15cyclictest3299188-21taskset3
284773499191,15cyclictest0-21swapper/33
284773499191,15cyclictest0-21swapper/33
284773499191,14cyclictest0-21swapper/33
284773499191,14cyclictest0-21swapper/33
284773499191,14cyclictest0-21swapper/33
284773499191,14cyclictest0-21swapper/33
32732612181,3sleep00-21swapper/00
31701212181,13sleep03170185-21ssh0
30047202181,3sleep20-21swapper/22
290876621811,4sleep22908841-21tr2
284773499181,4cyclictest3306156-21taskset3
2847734991814,2cyclictest0-21swapper/33
2847734991812,4cyclictest0-21swapper/33
2847734991811,5cyclictest32670512chrt3
284773499181,14cyclictest0-21swapper/33
284773499181,14cyclictest0-21swapper/33
284773499181,14cyclictest0-21swapper/33
284773499181,14cyclictest0-21swapper/33
284773499181,14cyclictest0-21swapper/33
284773499181,14cyclictest0-21swapper/33
284773499181,14cyclictest0-21swapper/33
284773499181,14cyclictest0-21swapper/33
284773499181,14cyclictest0-21swapper/33
284773499181,13cyclictest0-21swapper/33
30546162171,2sleep20-21swapper/22
29140722170,4sleep12914325-21df1
2847734991712,3cyclictest0-21swapper/33
2847734991711,4cyclictest2908741-21chrt3
284773499171,13cyclictest0-21swapper/33
284773499171,13cyclictest0-21swapper/33
284773499171,13cyclictest0-21swapper/33
284773499171,13cyclictest0-21swapper/33
284773499171,12cyclictest0-21swapper/33
284773499170,15cyclictest0-21swapper/33
284773499170,15cyclictest0-21swapper/33
284773499170,14cyclictest0-21swapper/33
284773499170,14cyclictest0-21swapper/33
284773499170,14cyclictest0-21swapper/33
284773499170,14cyclictest0-21swapper/33
284773499170,13cyclictest0-21swapper/33
31552762160,3sleep20-21swapper/22
31145552161,3sleep00-21swapper/00
30219882161,3sleep03023597-21cut0
30177362161,4sleep12978136-21diskmemload1
2847734991613,1cyclictest0-21swapper/33
2847734991612,2cyclictest0-21swapper/33
284773499161,14cyclictest0-21swapper/33
2847734991611,3cyclictest0-21swapper/33
284773499160,13cyclictest0-21swapper/33
284773499160,13cyclictest0-21swapper/33
284773499160,13cyclictest0-21swapper/33
284773499160,13cyclictest0-21swapper/33
284773499160,12cyclictest0-21swapper/33
33148812150,3sleep244-21ksoftirqd/22
32328792150,1sleep00-21swapper/00
32049242150,1sleep00-21swapper/00
31373382151,9sleep22978136-21diskmemload2
31286272155,4sleep1331ktimers/11
31219932150,3sleep10-21swapper/11
31044802151,3sleep20-21swapper/22
30802212150,3sleep20-21swapper/22
30802212150,3sleep20-21swapper/22
30694172151,4sleep03069428-21sh0
30615512151,3sleep12978136-21diskmemload1
30361502151,3sleep20-21swapper/22
30123492151,4sleep02978136-21diskmemload0
30009422151,3sleep22978136-21diskmemload2
29873462151,2sleep10-21swapper/11
2847734991513,1cyclictest0-21swapper/33
2847734991512,1cyclictest0-21swapper/33
284773499151,12cyclictest0-21swapper/33
284773499150,12cyclictest2902800-21chrt3
284773499150,12cyclictest0-21swapper/33
284773499150,11cyclictest0-21swapper/33
32576742142,8sleep02978136-21diskmemload0
32218442141,3sleep12978136-21diskmemload1
31895742141,8sleep02978136-21diskmemload0
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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