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2026-04-10 - 22:44

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 Fri Apr 10, 2026 12:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
166618421420,1sleep172-21kcompactd01
1467037211859,55sleep30-21swapper/33
146688627952,7sleep00-21swapper/00
146692227860,12sleep10-21swapper/11
146218827859,12sleep20-21swapper/22
19580512270,2sleep20-21swapper/22
1467283992623,1cyclictest0-21swapper/33
146728399244,8cyclictest0-21swapper/33
18426152230,2sleep30-21swapper/33
146728399222,16cyclictest17101862chrt3
146728399221,9cyclictest1633806-21turbostat3
1467283992212,6cyclictest16576332chrt3
146728399221,17cyclictest0-21swapper/33
146728399211,17cyclictest0-21swapper/33
146728399202,4cyclictest19673692sleep33
146728399202,4cyclictest19673692sleep33
1467283992011,6cyclictest0-21swapper/33
146728399201,15cyclictest1947887-21taskset3
146728399201,15cyclictest0-21swapper/33
146728399201,14cyclictest18078092sleep33
18081962190,7sleep134-21ksoftirqd/11
146728399194,13cyclictest0-21swapper/33
146728399193,13cyclictest0-21swapper/33
1467283991916,1cyclictest0-21swapper/33
146728399191,15cyclictest0-21swapper/33
146728399191,15cyclictest0-21swapper/33
146728399191,15cyclictest0-21swapper/33
146728399191,15cyclictest0-21swapper/33
146728399191,14cyclictest0-21swapper/33
146728399191,14cyclictest0-21swapper/33
146728399191,14cyclictest0-21swapper/33
146728399191,14cyclictest0-21swapper/33
146728399191,14cyclictest0-21swapper/33
146728399191,14cyclictest0-21swapper/33
146728399191,14cyclictest0-21swapper/33
146728399190,1cyclictest0-21swapper/33
18418222180,6sleep1331ktimers/11
17912402181,2sleep00-21swapper/00
1467283991816,1cyclictest0-21swapper/33
1467283991816,1cyclictest0-21swapper/33
146728399181,14cyclictest0-21swapper/33
146728399181,14cyclictest0-21swapper/33
146728399181,14cyclictest0-21swapper/33
146728399181,14cyclictest0-21swapper/33
146728399181,14cyclictest0-21swapper/33
146728399181,14cyclictest0-21swapper/33
146728399181,13cyclictest0-21swapper/33
146728399181,13cyclictest0-21swapper/33
146728399181,13cyclictest0-21swapper/33
146728399181,13cyclictest0-21swapper/33
146728399181,13cyclictest0-21swapper/33
146728399181,11cyclictest0-21swapper/33
146728399180,15cyclictest0-21swapper/33
19134012171,7sleep01913413-21ssh0
18429572171,12sleep21842971-21ssh2
17977902171,5sleep21598628-21diskmemload2
16308452171,3sleep00-21swapper/00
146728399171,13cyclictest0-21swapper/33
146728399171,13cyclictest0-21swapper/33
146728399171,13cyclictest0-21swapper/33
146728399171,13cyclictest0-21swapper/33
146728399171,13cyclictest0-21swapper/33
146728399171,12cyclictest1598297-21taskset3
146728399170,13cyclictest0-21swapper/33
18525882161,10sleep11598628-21diskmemload1
17977642161,3sleep00-21swapper/00
17817182161,4sleep01781729-21ssh0
146728399168,5cyclictest1517688-21turbostat3
146728399162,9cyclictest66950irq/132-enp1s0-TxRx-33
1467283991613,1cyclictest0-21swapper/33
1467283991611,3cyclictest0-21swapper/33
146728399160,13cyclictest0-21swapper/33
146728399160,13cyclictest0-21swapper/33
19650442151,2sleep00-21swapper/00
19650442151,2sleep00-21swapper/00
18351192150,2sleep00-21swapper/00
18338792150,2sleep20-21swapper/22
17621682151,3sleep11598628-21diskmemload1
17549422151,2sleep00-21swapper/00
17436902151,9sleep21743791-21ntpq2
16975892151,10sleep01699306-21cut0
16517012151,9sleep01651971-21df0
16031802151,10sleep21603241-21collect22
16031802151,10sleep21603241-21collect22
15828112151,4sleep11582830-21apt-get1
15060292151,9sleep21506077-21ntpq2
146728399151,3cyclictest0-21swapper/33
1467283991513,1cyclictest0-21swapper/33
1467283991512,2cyclictest0-21swapper/33
146728399151,11cyclictest0-21swapper/33
146728399150,13cyclictest0-21swapper/33
146728399150,12cyclictest0-21swapper/33
146728399150,12cyclictest0-21swapper/33
146728399150,12cyclictest0-21swapper/33
146728399150,12cyclictest0-21swapper/33
19037282141,7sleep11598628-21diskmemload1
18586262142,8sleep01598628-21diskmemload0
17997582140,3sleep11598628-21diskmemload1
16327582142,6sleep21598628-21diskmemload2
16235182140,10sleep01623533-21ssh0
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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