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2026-04-27 - 21:16

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 Mon Apr 27, 2026 12:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
50959211858,56sleep30-21swapper/33
5101528755,12sleep10-21swapper/11
1958792860,1sleep2195878-21ssh2
5099628366,11sleep20-21swapper/22
5104927959,14sleep00-21swapper/00
604162400,5sleep0471rcuog/20
51283992511,9cyclictest442324-21taskset3
5128399226,14cyclictest0-21swapper/33
51283992117,2cyclictest0-21swapper/33
5128399211,16cyclictest66950irq/132-enp1s0-TxRx-33
51283992013,4cyclictest509510-21taskset3
5128399201,15cyclictest66950irq/132-enp1s0-TxRx-33
5128399201,14cyclictest0-21swapper/33
5128399201,13cyclictest0-21swapper/33
3889032201,5sleep2388961-21ntpq2
5128399192,15cyclictest66950irq/132-enp1s0-TxRx-33
51283991911,6cyclictest0-21swapper/33
51283991911,5cyclictest255754-21taskset3
5128399191,15cyclictest0-21swapper/33
5128399191,15cyclictest0-21swapper/33
5128399191,14cyclictest272304-21taskset3
5128399191,14cyclictest196188-21taskset3
5128399191,14cyclictest0-21swapper/33
5128399191,14cyclictest0-21swapper/33
5128399191,14cyclictest0-21swapper/33
5128399191,13cyclictest0-21swapper/33
5005952191,12sleep00-21swapper/00
4189442191,3sleep2420146-21kthreadcore2
5128399181,5cyclictest0-21swapper/33
5128399181,4cyclictest117470-21taskset3
5128399181,14cyclictest0-21swapper/33
5128399181,14cyclictest0-21swapper/33
5128399181,14cyclictest0-21swapper/33
5128399181,14cyclictest0-21swapper/33
5128399181,14cyclictest0-21swapper/33
5128399181,14cyclictest0-21swapper/33
5128399181,14cyclictest0-21swapper/33
5128399181,14cyclictest0-21swapper/33
5128399181,14cyclictest0-21swapper/33
5128399181,14cyclictest0-21swapper/33
5128399181,14cyclictest0-21swapper/33
5128399181,13cyclictest0-21swapper/33
5128399181,13cyclictest0-21swapper/33
5128399181,13cyclictest0-21swapper/33
5128399181,13cyclictest0-21swapper/33
5128399181,13cyclictest0-21swapper/33
5128399180,14cyclictest0-21swapper/33
5171272178,2sleep2171rcu_preempt2
5128399172,10cyclictest262112-21taskset3
51283991712,3cyclictest0-21swapper/33
5128399171,13cyclictest0-21swapper/33
5128399171,13cyclictest0-21swapper/33
5128399171,13cyclictest0-21swapper/33
5128399171,13cyclictest0-21swapper/33
5128399171,13cyclictest0-21swapper/33
5128399171,13cyclictest0-21swapper/33
5128399170,14cyclictest0-21swapper/33
5128399170,14cyclictest0-21swapper/33
1875862171,3sleep00-21swapper/00
5128399169,4cyclictest1497512sleep33
51283991613,1cyclictest0-21swapper/33
5128399160,13cyclictest0-21swapper/33
5128399160,13cyclictest0-21swapper/33
5128399160,13cyclictest0-21swapper/33
3847162161,5sleep1384789-21grep1
3496382161,4sleep2181976-21diskmemload2
2720712161,11sleep1272082-21ssh1
2652262162,9sleep0181976-21diskmemload0
2375082161,4sleep2237557-21ntpq2
2326442160,2sleep0232655-21ssh0
853482151,10sleep184777-31find1
5128399151,8cyclictest1180082sleep33
51283991512,2cyclictest0-21swapper/33
51283991512,2cyclictest0-21swapper/33
5128399151,12cyclictest0-21swapper/33
5128399150,13cyclictest0-21swapper/33
5128399150,13cyclictest0-21swapper/33
5128399150,13cyclictest0-21swapper/33
5128399150,12cyclictest0-21swapper/33
5128399150,12cyclictest0-21swapper/33
5128399150,12cyclictest0-21swapper/33
5128399150,12cyclictest0-21swapper/33
5128399150,12cyclictest0-21swapper/33
4510592150,3sleep00-21swapper/00
4488622151,9sleep1181976-21diskmemload1
4243862151,2sleep10-21swapper/11
2991392151,2sleep20-21swapper/22
2970222150,1sleep00-21swapper/00
2681002151,10sleep2269773-21grep2
2580092156,6sleep1181976-21diskmemload1
1759832159,3sleep00-21swapper/00
911062141,9sleep191133-21perf1
911062141,9sleep191133-21perf1
5256092141,9sleep1525620-21ssh1
51283991412,1cyclictest0-21swapper/33
5128399140,12cyclictest0-21swapper/33
4571362141,9sleep0457146-21ssh0
4140572141,9sleep0414121-21ntpq0
4088932141,3sleep0181976-21diskmemload0
3937082141,7sleep0394473-21grep0
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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