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2026-05-15 - 01:00

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 May 14, 2026 12:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2325747212951,73sleep30-21swapper/33
2325747212951,73sleep30-21swapper/33
232592228968,11sleep10-21swapper/11
232592228968,11sleep10-21swapper/11
232597328354,10sleep20-21swapper/22
232597328354,10sleep20-21swapper/22
232591627858,14sleep00-21swapper/00
232591627858,14sleep00-21swapper/00
25215182300,2sleep30-21swapper/33
232620399221,17cyclictest2606630-21chrt3
232620399211,17cyclictest0-21swapper/33
232620399201,15cyclictest66950irq/132-enp1s0-TxRx-33
232620399200,18cyclictest0-21swapper/33
27832532191,9sleep22456825-21diskmemload2
27363532191,3sleep22737298-21cut2
232620399197,7cyclictest2781632-21taskset3
2326203991916,1cyclictest0-21swapper/33
232620399191,15cyclictest0-21swapper/33
232620399191,14cyclictest2672584-21taskset3
232620399191,14cyclictest0-21swapper/33
232620399191,14cyclictest0-21swapper/33
232620399191,14cyclictest0-21swapper/33
232620399191,13cyclictest2583590-21chrt3
232620399190,16cyclictest66950irq/132-enp1s0-TxRx-33
232620399190,12cyclictest0-21swapper/33
27776682186,8sleep02456825-21diskmemload0
26166962181,2sleep10-21swapper/11
232620399181,14cyclictest0-21swapper/33
232620399181,14cyclictest0-21swapper/33
232620399181,14cyclictest0-21swapper/33
232620399181,14cyclictest0-21swapper/33
232620399181,14cyclictest0-21swapper/33
232620399181,14cyclictest0-21swapper/33
232620399181,13cyclictest0-21swapper/33
232620399181,13cyclictest0-21swapper/33
232620399181,13cyclictest0-21swapper/33
232620399181,13cyclictest0-21swapper/33
232620399181,13cyclictest0-21swapper/33
232620399181,13cyclictest0-21swapper/33
232620399181,13cyclictest0-21swapper/33
232620399180,15cyclictest66950irq/132-enp1s0-TxRx-33
232620399180,15cyclictest0-21swapper/33
232620399180,14cyclictest0-21swapper/33
232620399180,14cyclictest0-21swapper/33
232620399180,14cyclictest0-21swapper/33
27863592172,11sleep02786462-21perl0
25901452171,3sleep10-21swapper/11
25560022172,4sleep02456825-21diskmemload0
25316232171,2sleep20-21swapper/22
25049692171,6sleep22456825-21diskmemload2
232620399179,4cyclictest23605912sleep33
232620399176,8cyclictest2381675-21turbostat3
232620399171,7cyclictest2582194-21taskset3
232620399171,14cyclictest0-21swapper/33
232620399171,12cyclictest0-21swapper/33
232620399171,12cyclictest0-21swapper/33
2326203991710,3cyclictest2397674-21taskset3
232620399170,3cyclictest0-21swapper/33
232620399170,14cyclictest0-21swapper/33
232620399170,14cyclictest0-21swapper/33
232620399170,14cyclictest0-21swapper/33
232620399170,13cyclictest2359872-21chrt3
232620399170,13cyclictest0-21swapper/33
27515832161,3sleep20-21swapper/22
27155882161,2sleep10-21swapper/11
26589892161,4sleep02456825-21diskmemload0
26317322160,3sleep20-21swapper/22
24624732161,2sleep20-21swapper/22
232620399161,3cyclictest0-21swapper/33
232620399161,3cyclictest0-21swapper/33
2326203991612,2cyclictest0-21swapper/33
232620399161,13cyclictest0-21swapper/33
232620399161,12cyclictest0-21swapper/33
232620399161,12cyclictest0-21swapper/33
232620399160,14cyclictest0-21swapper/33
232620399160,13cyclictest0-21swapper/33
232620399160,13cyclictest0-21swapper/33
27845172151,3sleep12456825-21diskmemload1
26939342152,8sleep02694129-21sed0
26640912151,7sleep22456825-21diskmemload2
26511162151,3sleep12456825-21diskmemload1
25658742151,2sleep20-21swapper/22
25162142151,2sleep10-21swapper/11
25154092153,8sleep22490866-21kworker/u16:2+rpciod2
24987172150,2sleep10-21swapper/11
24796282151,4sleep22456825-21diskmemload2
24745312151,5sleep12474566-21/usr/sbin/munin1
24715152151,3sleep22456825-21diskmemload2
24710152151,3sleep10-21swapper/11
2326203991511,2cyclictest0-21swapper/33
232620399150,13cyclictest0-21swapper/33
232620399150,12cyclictest0-21swapper/33
232620399150,12cyclictest0-21swapper/33
232620399150,12cyclictest0-21swapper/33
27744362141,3sleep22456825-21diskmemload2
27594732141,2sleep10-21swapper/11
27239992141,6sleep22724014-21ssh2
26237322141,3sleep22456825-21diskmemload2
24830362141,8sleep22483172-21gltestperf2
232620399141,9cyclictest2344461-21chrt3
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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