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2026-05-23 - 21:34

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 23, 2026 12:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
281438222280,1sleep22814379-21perf2
2726354212254,63sleep30-21swapper/33
312877921170,2sleep20-21swapper/22
272582628456,16sleep10-21swapper/11
272625628354,11sleep20-21swapper/22
272154127955,17sleep00-21swapper/00
30689752340,2sleep20-21swapper/22
313753522312,7sleep13137549-21apt-get1
27344202231,17sleep12734543-21diskstats1
272671299231,17cyclictest0-21swapper/33
272671299212,16cyclictest66950irq/132-enp1s0-TxRx-33
272671299211,16cyclictest2908081-21taskset3
272671299211,16cyclictest0-21swapper/33
2726712992016,3cyclictest66950irq/132-enp1s0-TxRx-33
2726712992012,4cyclictest2978925-21taskset3
272671299201,16cyclictest0-21swapper/33
272671299201,16cyclictest0-21swapper/33
272671299201,16cyclictest0-21swapper/33
272671299201,15cyclictest66950irq/132-enp1s0-TxRx-33
272671299201,15cyclictest0-21swapper/33
2726712992010,7cyclictest2914994-21taskset3
272671299200,18cyclictest0-21swapper/33
32059412190,1sleep20-21swapper/22
272671299191,15cyclictest0-21swapper/33
272671299191,15cyclictest0-21swapper/33
272671299191,14cyclictest0-21swapper/33
272671299191,14cyclictest0-21swapper/33
272671299191,14cyclictest0-21swapper/33
272671299191,14cyclictest0-21swapper/33
31614552180,6sleep2431ktimers/22
27595872181,12sleep12759728-21ntpq1
272671299189,6cyclictest2744712-21turbostat3
272671299187,1cyclictest0-21swapper/33
2726712991815,1cyclictest0-21swapper/33
2726712991812,3cyclictest0-21swapper/33
2726712991811,5cyclictest30062822chrt3
272671299181,14cyclictest0-21swapper/33
272671299181,14cyclictest0-21swapper/33
272671299181,14cyclictest0-21swapper/33
272671299181,14cyclictest0-21swapper/33
272671299181,14cyclictest0-21swapper/33
272671299181,14cyclictest0-21swapper/33
272671299181,14cyclictest0-21swapper/33
272671299181,14cyclictest0-21swapper/33
272671299181,14cyclictest0-21swapper/33
272671299181,14cyclictest0-21swapper/33
272671299181,14cyclictest0-21swapper/33
272671299181,14cyclictest0-21swapper/33
272671299181,13cyclictest0-21swapper/33
272671299181,13cyclictest0-21swapper/33
272671299180,16cyclictest0-21swapper/33
32162042172,8sleep03216476-21df_inode0
31900262172,5sleep23190050-21apt-get2
31900262172,5sleep23190050-21apt-get2
31699222171,4sleep02857293-21diskmemload0
30846612170,1sleep00-21swapper/00
30214812171,2sleep20-21swapper/22
29536562171,3sleep20-21swapper/22
272671299178,5cyclictest2835697-21turbostat3
2726712991712,4cyclictest0-21swapper/33
272671299171,13cyclictest0-21swapper/33
272671299171,13cyclictest0-21swapper/33
272671299171,13cyclictest0-21swapper/33
272671299171,13cyclictest0-21swapper/33
272671299171,13cyclictest0-21swapper/33
272671299170,15cyclictest0-21swapper/33
30994612161,7sleep13099467-21ssh1
29860842160,4sleep00-21swapper/00
29317552162,5sleep12931803-21ntpq1
29253542160,1sleep20-21swapper/22
272671299161,3cyclictest0-21swapper/33
2726712991613,1cyclictest0-21swapper/33
2726712991612,2cyclictest0-21swapper/33
272671299161,12cyclictest2798081-21chrt3
272671299161,12cyclictest0-21swapper/33
272671299160,14cyclictest0-21swapper/33
272671299160,13cyclictest0-21swapper/33
272671299160,13cyclictest0-21swapper/33
272671299160,13cyclictest0-21swapper/33
272671299160,13cyclictest0-21swapper/33
272671299160,13cyclictest0-21swapper/33
31954572152,3sleep02857293-21diskmemload0
31954572152,3sleep02857293-21diskmemload0
31442542151,3sleep20-21swapper/22
31200012151,9sleep02857293-21diskmemload0
30831162151,3sleep10-21swapper/11
30387802151,10sleep13038794-21ssh1
29905782151,6sleep22992279-21tr2
29674502151,9sleep22857293-21diskmemload2
272671299159,3cyclictest28142722sleep33
272671299158,4cyclictest0-21swapper/33
272671299157,6cyclictest3207813-21taskset3
2726712991512,2cyclictest0-21swapper/33
272671299151,10cyclictest2824086-21taskset3
272671299150,13cyclictest0-21swapper/33
272671299150,13cyclictest0-21swapper/33
272671299150,12cyclictest0-21swapper/33
31866672141,9sleep03186681-21ssh0
31865322141,4sleep13186543-21ssh1
31705432141,2sleep12857293-21diskmemload1
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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