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2026-05-01 - 23:11

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 May 01, 2026 12:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
980929212349,68sleep30-21swapper/33
98063228667,12sleep20-21swapper/22
98077928063,10sleep10-21swapper/11
98077727551,17sleep00-21swapper/00
981112992217,3cyclictest0-21swapper/33
98111299221,17cyclictest66950irq/132-enp1s0-TxRx-33
98111299221,17cyclictest1230044-21taskset3
98111299220,18cyclictest1375106-21chrt3
117337322211,3sleep21175075-21kthreadcore2
98111299210,18cyclictest66950irq/132-enp1s0-TxRx-33
98111299201,16cyclictest1245041-21taskset3
98111299201,14cyclictest0-21swapper/33
14609672202,5sleep11460995-21apt-get1
14234232201,3sleep00-21swapper/00
14232542200,12sleep134-21ksoftirqd/11
98111299199,6cyclictest12874722sleep33
981112991914,3cyclictest66950irq/132-enp1s0-TxRx-33
981112991912,5cyclictest0-21swapper/33
98111299191,15cyclictest0-21swapper/33
98111299191,14cyclictest0-21swapper/33
98111299191,14cyclictest0-21swapper/33
98111299191,14cyclictest0-21swapper/33
98111299191,14cyclictest0-21swapper/33
98111299191,14cyclictest0-21swapper/33
98111299191,14cyclictest0-21swapper/33
98111299191,14cyclictest0-21swapper/33
98111299191,14cyclictest0-21swapper/33
12010282190,15sleep11201168-21ssh1
98111299181,5cyclictest0-21swapper/33
98111299181,5cyclictest0-21swapper/33
981112991814,2cyclictest0-21swapper/33
981112991812,4cyclictest0-21swapper/33
981112991811,4cyclictest66950irq/132-enp1s0-TxRx-33
981112991811,4cyclictest0-21swapper/33
98111299181,14cyclictest0-21swapper/33
98111299181,14cyclictest0-21swapper/33
98111299181,14cyclictest0-21swapper/33
98111299181,14cyclictest0-21swapper/33
98111299181,14cyclictest0-21swapper/33
98111299181,14cyclictest0-21swapper/33
98111299181,14cyclictest0-21swapper/33
98111299181,14cyclictest0-21swapper/33
98111299181,13cyclictest1147017-21taskset3
98111299181,13cyclictest0-21swapper/33
98111299181,13cyclictest0-21swapper/33
98111299181,12cyclictest1111790-21sleep3
98111299180,15cyclictest0-21swapper/33
98111299180,15cyclictest0-21swapper/33
12903742181,2sleep20-21swapper/22
98111299177,6cyclictest13083282sleep33
98111299171,13cyclictest1171301-21turbostat3
98111299171,13cyclictest0-21swapper/33
98111299171,13cyclictest0-21swapper/33
98111299171,13cyclictest0-21swapper/33
98111299171,13cyclictest0-21swapper/33
98111299171,12cyclictest1057716-21taskset3
98111299170,9cyclictest0-21swapper/33
98111299170,15cyclictest0-21swapper/33
14653032171,10sleep01465402-21ps0
14583062171,11sleep11111764-21diskmemload1
12722672170,8sleep01111764-21diskmemload0
12070362172,11sleep00-21swapper/00
10858602171,7sleep01086600-21grep0
981112991613,2cyclictest0-21swapper/33
98111299160,13cyclictest0-21swapper/33
98111299160,13cyclictest0-21swapper/33
98111299160,13cyclictest0-21swapper/33
98111299160,13cyclictest0-21swapper/33
98111299160,13cyclictest0-21swapper/33
98111299160,13cyclictest0-21swapper/33
98111299160,13cyclictest0-21swapper/33
98111299160,12cyclictest0-21swapper/33
13564992160,1sleep10-21swapper/11
13464092161,11sleep11111764-21diskmemload1
13388282161,3sleep20-21swapper/22
12275722162,4sleep01111764-21diskmemload0
12016282161,4sleep01201667-21sed0
11802362161,9sleep21180377-21diskstats2
98111299159,4cyclictest0-21swapper/33
98111299156,6cyclictest10311052sleep33
981112991512,2cyclictest0-21swapper/33
98111299150,13cyclictest0-21swapper/33
98111299150,12cyclictest0-21swapper/33
14347782150,1sleep10-21swapper/11
13389072151,9sleep01111764-21diskmemload0
12905402151,4sleep01111764-21diskmemload0
12367182151,3sleep01111764-21diskmemload0
11876912151,2sleep00-21swapper/00
11608872150,1sleep00-21swapper/00
11452342151,2sleep00-21swapper/00
981112991411,2cyclictest0-21swapper/33
981112991411,2cyclictest0-21swapper/33
98111299141,10cyclictest0-21swapper/33
14564202141,7sleep21456479-21ntpq2
14480442141,7sleep01448103-21ntpq0
14411622141,3sleep21111764-21diskmemload2
14337772140,2sleep00-21swapper/00
13666072141,5sleep11111764-21diskmemload1
12721072141,8sleep21111764-21diskmemload2
11758612141,6sleep11175915-21ssh1
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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