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2026-09-28 - 16:45

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 Sep 28, 2026 12:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
544404211959,54sleep30-21swapper/33
54431229375,12sleep10-21swapper/11
54414728871,11sleep20-21swapper/22
54414528774,6sleep00-21swapper/00
9908322290,2sleep30-21swapper/33
544570992518,4cyclictest963156-21taskset3
54457099251,3cyclictest0-21swapper/33
54457099251,3cyclictest0-21swapper/33
54457099251,2cyclictest0-21swapper/33
54457099251,2cyclictest0-21swapper/33
6203102233,16sleep0620094-21sendmail-msp0
54457099221,18cyclictest0-21swapper/33
54457099220,18cyclictest0-21swapper/33
544570992117,2cyclictest0-21swapper/33
544570992113,6cyclictest0-21swapper/33
54457099211,16cyclictest862429-21taskset3
54457099211,16cyclictest0-21swapper/33
54457099210,19cyclictest0-21swapper/33
8625042201,7sleep20-21swapper/22
8063772201,2sleep00-21swapper/00
544570992018,1cyclictest0-21swapper/33
544570992015,2cyclictest0-21swapper/33
54457099201,16cyclictest0-21swapper/33
54457099201,16cyclictest0-21swapper/33
54457099201,16cyclictest0-21swapper/33
54457099201,16cyclictest0-21swapper/33
54457099201,15cyclictest0-21swapper/33
54457099201,15cyclictest0-21swapper/33
544570992010,7cyclictest763409-21chrt3
54457099200,18cyclictest0-21swapper/33
54457099200,11cyclictest0-21swapper/33
7735182191,14sleep20-21swapper/22
6039962191,2sleep10-21swapper/11
5833522191,13sleep10-21swapper/11
54457099196,10cyclictest641020-21turbostat3
54457099191,15cyclictest567592-21turbostat3
54457099191,15cyclictest0-21swapper/33
54457099191,15cyclictest0-21swapper/33
54457099191,15cyclictest0-21swapper/33
54457099191,14cyclictest880941-21taskset3
54457099191,14cyclictest0-21swapper/33
54457099191,14cyclictest0-21swapper/33
54457099191,14cyclictest0-21swapper/33
54457099191,14cyclictest0-21swapper/33
54457099191,13cyclictest583079-21taskset3
54457099190,16cyclictest0-21swapper/33
10052402191,5sleep2672610-21diskmemload2
9644162187,2sleep1171rcu_preempt1
8875852180,1sleep20-21swapper/22
54457099188,3cyclictest0-21swapper/33
54457099181,3cyclictest0-21swapper/33
54457099181,3cyclictest0-21swapper/33
54457099181,14cyclictest981043-21taskset3
54457099181,14cyclictest0-21swapper/33
54457099181,14cyclictest0-21swapper/33
54457099181,14cyclictest0-21swapper/33
54457099181,14cyclictest0-21swapper/33
54457099181,14cyclictest0-21swapper/33
54457099181,14cyclictest0-21swapper/33
54457099180,15cyclictest0-21swapper/33
54457099180,14cyclictest0-21swapper/33
9387002171,3sleep10-21swapper/11
8888452171,4sleep0888855-21ssh0
7901962171,11sleep00-21swapper/00
7891292171,5sleep1672610-21diskmemload1
7641912171,2sleep1764204-21ssh1
7310062170,7sleep20-21swapper/22
7065272171,9sleep00-21swapper/00
5866912170,1sleep20-21swapper/22
5520802171,4sleep2552077-21apt-get2
54457099171,7cyclictest672618-21turbostat3
54457099171,3cyclictest0-21swapper/33
544570991711,5cyclictest0-21swapper/33
544570991711,4cyclictest0-21swapper/33
54457099171,13cyclictest0-21swapper/33
54457099171,13cyclictest0-21swapper/33
54457099171,13cyclictest0-21swapper/33
54457099171,13cyclictest0-21swapper/33
54457099170,13cyclictest599058-21turbostat3
9893502161,3sleep10-21swapper/11
9796172161,5sleep2672610-21diskmemload2
9484242160,1sleep20-21swapper/22
9312692160,1sleep10-21swapper/11
9312692160,1sleep10-21swapper/11
8036852161,4sleep2672610-21diskmemload2
54457099166,2cyclictest0-21swapper/33
54457099161,6cyclictest614809-21turbostat3
54457099161,3cyclictest0-21swapper/33
544570991613,1cyclictest0-21swapper/33
54457099161,2cyclictest0-21swapper/33
54457099161,2cyclictest0-21swapper/33
544570991611,3cyclictest0-21swapper/33
10055422161,3sleep00-21swapper/00
8382612151,10sleep1838273-21ssh1
7716962151,8sleep2672610-21diskmemload2
7475472158,3sleep2544568-21cyclictest2
7148852151,7sleep1715148-21df1
7034462151,8sleep20-21swapper/22
6791402151,2sleep00-21swapper/00
54457099155,3cyclictest0-21swapper/33
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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