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2026-06-14 - 01:33

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 Jun 13, 2026 12:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
252250922080,2sleep02522507-21ntpq0
262494521420,2sleep0221rcuc/00
2150888212752,70sleep30-21swapper/33
215031928055,14sleep10-21swapper/11
215074827858,14sleep00-21swapper/00
215087727658,12sleep20-21swapper/22
2151215992220,1cyclictest0-21swapper/33
2151215992218,2cyclictest0-21swapper/33
215121599221,16cyclictest2290864-21chrt3
26329352211,3sleep00-21swapper/00
24512452211,8sleep02451457-21hddtemp_smartct0
2151215992118,1cyclictest0-21swapper/33
215121599211,17cyclictest0-21swapper/33
215121599211,16cyclictest2467118-21taskset3
215121599211,14cyclictest0-21swapper/33
25176522200,2sleep30-21swapper/33
24978692201,2sleep10-21swapper/11
215121599201,16cyclictest0-21swapper/33
215121599201,14cyclictest0-21swapper/33
2151215991916,2cyclictest0-21swapper/33
2151215991916,1cyclictest0-21swapper/33
215121599191,15cyclictest0-21swapper/33
215121599191,15cyclictest0-21swapper/33
215121599191,14cyclictest2322434-21taskset3
215121599191,14cyclictest0-21swapper/33
215121599191,14cyclictest0-21swapper/33
2151215991910,6cyclictest2523649-21taskset3
26091202181,4sleep02282162-21diskmemload0
22547532181,7sleep22254927-21cat2
2151215991816,1cyclictest0-21swapper/33
2151215991814,2cyclictest0-21swapper/33
2151215991813,3cyclictest66950irq/132-enp1s0-TxRx-33
2151215991813,2cyclictest0-21swapper/33
2151215991811,6cyclictest0-21swapper/33
215121599181,14cyclictest0-21swapper/33
215121599181,14cyclictest0-21swapper/33
215121599181,14cyclictest0-21swapper/33
215121599181,14cyclictest0-21swapper/33
215121599181,14cyclictest0-21swapper/33
215121599181,14cyclictest0-21swapper/33
215121599181,14cyclictest0-21swapper/33
215121599181,14cyclictest0-21swapper/33
215121599181,14cyclictest0-21swapper/33
215121599181,13cyclictest0-21swapper/33
215121599181,13cyclictest0-21swapper/33
215121599181,13cyclictest0-21swapper/33
215121599181,13cyclictest0-21swapper/33
215121599181,13cyclictest0-21swapper/33
25657242171,5sleep02282162-21diskmemload0
25322642171,4sleep02282162-21diskmemload0
24141552171,3sleep10-21swapper/11
23132982171,4sleep12282162-21diskmemload1
21750192171,5sleep12175272-21df1
215121599171,4cyclictest0-21swapper/33
215121599171,4cyclictest0-21swapper/33
2151215991713,2cyclictest0-21swapper/33
2151215991712,3cyclictest0-21swapper/33
215121599171,13cyclictest0-21swapper/33
215121599171,13cyclictest0-21swapper/33
215121599171,12cyclictest0-21swapper/33
215121599170,14cyclictest0-21swapper/33
215121599170,14cyclictest0-21swapper/33
215121599170,14cyclictest0-21swapper/33
215121599170,14cyclictest0-21swapper/33
215121599170,13cyclictest0-21swapper/33
26170522161,2sleep00-21swapper/00
24410792161,3sleep20-21swapper/22
24322282162,8sleep02282162-21diskmemload0
24065932161,3sleep20-21swapper/22
21637882167,2sleep2171rcu_preempt2
215121599163,1cyclictest0-21swapper/33
2151215991613,1cyclictest0-21swapper/33
215121599161,13cyclictest0-21swapper/33
215121599160,13cyclictest0-21swapper/33
215121599160,13cyclictest0-21swapper/33
215121599160,12cyclictest0-21swapper/33
25933292151,7sleep22593340-21ssh2
25930472151,2sleep10-21swapper/11
25594922151,3sleep02282162-21diskmemload0
25080712151,4sleep12508082-21ssh1
24818942151,9sleep20-21swapper/22
24308132157,5sleep12151209-21cyclictest1
24144782151,4sleep02282162-21diskmemload0
24138822151,4sleep22413895-21ssh2
24072202151,4sleep12282162-21diskmemload1
23634442150,2sleep00-21swapper/00
23485882151,9sleep12282162-21diskmemload1
21805842151,4sleep12180687-21perl1
215121599156,6cyclictest2174760-21turbostat3
215121599153,8cyclictest0-21swapper/33
215121599151,2cyclictest0-21swapper/33
2151215991511,2cyclictest0-21swapper/33
2151215991510,3cyclictest0-21swapper/33
215121599150,13cyclictest0-21swapper/33
215121599150,12cyclictest0-21swapper/33
26246312141,4sleep12618267-21kworker/u16:2+rpciod1
25504602141,2sleep20-21swapper/22
25176802141,4sleep12517700-21apt-get1
24564182141,4sleep22456429-21ssh2
24486232140,3sleep20-21swapper/22
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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