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2026-03-24 - 15:39

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 Tue Mar 24, 2026 12:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3003267211856,57sleep30-21swapper/33
311154721170,2sleep10-21swapper/11
300330728756,10sleep20-21swapper/22
300332028562,6sleep00-21swapper/00
300328528251,12sleep10-21swapper/11
33508552251,3sleep00-21swapper/00
300364999250,7cyclictest0-21swapper/33
32475702241,2sleep10-21swapper/11
300364999242,8cyclictest3299864-21taskset3
300364999242,8cyclictest3299864-21taskset3
300364999242,18cyclictest0-21swapper/33
31787802231,7sleep03180248-21kthreadcore0
300364999231,8cyclictest0-21swapper/33
300364999231,19cyclictest0-21swapper/33
35010692221,7sleep03501079-21ssh0
3003649992216,3cyclictest3227664-21taskset3
300364999221,5cyclictest3016277-21turbostat3
300364999221,18cyclictest0-21swapper/33
300364999220,13cyclictest0-21swapper/33
34859092210,9sleep134-21ksoftirqd/11
32047962212,7sleep23204932-21perl2
300364999212,16cyclictest0-21swapper/33
300364999211,7cyclictest3048368-21turbostat3
300364999211,4cyclictest0-21swapper/33
300364999211,17cyclictest0-21swapper/33
300364999211,17cyclictest0-21swapper/33
300364999210,18cyclictest0-21swapper/33
33446802201,4sleep23133908-21diskmemload2
300364999205,11cyclictest0-21swapper/33
300364999202,6cyclictest3123208-21turbostat3
300364999202,6cyclictest3123208-21turbostat3
300364999201,7cyclictest3107254-21turbostat3
300364999201,5cyclictest0-21swapper/33
3003649992013,5cyclictest0-21swapper/33
3003649992011,6cyclictest3307400-21taskset3
300364999201,16cyclictest0-21swapper/33
300364999201,15cyclictest3377214-21taskset3
300364999201,15cyclictest0-21swapper/33
300364999201,15cyclictest0-21swapper/33
300364999201,13cyclictest0-21swapper/33
34491812190,2sleep13133908-21diskmemload1
34028392191,7sleep23133908-21diskmemload2
31862552191,9sleep23133908-21diskmemload2
30645962191,2sleep00-21swapper/00
300364999191,7cyclictest3265739-21turbostat3
300364999191,7cyclictest3064347-21turbostat3
300364999191,6cyclictest3493679-21turbostat3
300364999191,6cyclictest3037704-21turbostat3
3003649991916,1cyclictest0-21swapper/33
3003649991915,2cyclictest0-21swapper/33
3003649991914,3cyclictest3150234-21taskset3
300364999191,16cyclictest0-21swapper/33
300364999191,15cyclictest32903442sleep33
300364999191,15cyclictest32903442sleep33
300364999191,15cyclictest0-21swapper/33
300364999191,15cyclictest0-21swapper/33
300364999191,15cyclictest0-21swapper/33
300364999191,15cyclictest0-21swapper/33
300364999191,14cyclictest0-21swapper/33
300364999191,14cyclictest0-21swapper/33
300364999191,14cyclictest0-21swapper/33
300364999190,2cyclictest0-21swapper/33
300364999190,10cyclictest0-21swapper/33
32631852181,7sleep13133908-21diskmemload1
32626182181,2sleep00-21swapper/00
300364999181,7cyclictest0-21swapper/33
300364999181,15cyclictest0-21swapper/33
300364999181,14cyclictest0-21swapper/33
300364999181,14cyclictest0-21swapper/33
300364999181,14cyclictest0-21swapper/33
300364999181,14cyclictest0-21swapper/33
300364999181,13cyclictest0-21swapper/33
300364999181,13cyclictest0-21swapper/33
300364999180,9cyclictest0-21swapper/33
300364999180,4cyclictest3031103-21taskset3
300364999180,1cyclictest0-21swapper/33
300364999180,16cyclictest0-21swapper/33
300364999180,14cyclictest0-21swapper/33
300364999171,13cyclictest0-21swapper/33
300364999171,12cyclictest0-21swapper/33
34784792161,7sleep13480214-21kthreadcore1
34759802161,2sleep10-21swapper/11
32296832161,3sleep10-21swapper/11
30473772161,10sleep23047424-21ntpq2
300364999162,6cyclictest0-21swapper/33
300364999161,3cyclictest0-21swapper/33
300364999160,13cyclictest0-21swapper/33
300364999160,13cyclictest0-21swapper/33
34120772150,1sleep20-21swapper/22
33957672151,2sleep10-21swapper/11
33361402155,2sleep0171rcu_preempt0
33333802151,2sleep20-21swapper/22
32936132151,9sleep13295062-21tr1
32936132151,9sleep13295062-21tr1
32560292151,3sleep13133908-21diskmemload1
32442512150,2sleep2431ktimers/22
32200562151,3sleep13133908-21diskmemload1
31699672151,10sleep03170803-21cut0
31114332150,4sleep03111546-21ntpq0
300364999150,12cyclictest0-21swapper/33
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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