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2026-04-21 - 03:50

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 Apr 21, 2026 00:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3378448211454,55sleep30-21swapper/33
337788828764,12sleep20-21swapper/22
337846128263,12sleep10-21swapper/11
337878027849,6sleep00-21swapper/00
35752612260,3sleep10-21swapper/11
36573762241,17sleep23509318-21diskmemload2
38098272211,1sleep10-21swapper/11
34775612218,8sleep23477684-21diskstats2
3378938992117,2cyclictest0-21swapper/33
337893899211,3cyclictest0-21swapper/33
337893899211,17cyclictest0-21swapper/33
337893899211,16cyclictest0-21swapper/33
337893899211,16cyclictest0-21swapper/33
337893899211,16cyclictest0-21swapper/33
337893899210,8cyclictest3666014-21chrt3
337893899210,8cyclictest3666014-21chrt3
337893899209,8cyclictest3614635-21taskset3
337893899201,15cyclictest3721837-21turbostat3
337893899200,7cyclictest3788441-21chrt3
3378938991917,1cyclictest0-21swapper/33
3378938991917,1cyclictest0-21swapper/33
3378938991912,4cyclictest3423815-21taskset3
3378938991911,6cyclictest0-21swapper/33
3378938991911,5cyclictest36010202sleep33
337893899191,15cyclictest0-21swapper/33
337893899191,15cyclictest0-21swapper/33
337893899191,14cyclictest0-21swapper/33
337893899191,14cyclictest0-21swapper/33
337893899191,14cyclictest0-21swapper/33
337893899191,14cyclictest0-21swapper/33
337893899191,14cyclictest0-21swapper/33
337893899190,2cyclictest0-21swapper/33
337893899190,16cyclictest66950irq/132-enp1s0-TxRx-33
35973162181,5sleep03597341-21apt-get0
3378938991815,1cyclictest0-21swapper/33
3378938991811,5cyclictest0-21swapper/33
337893899181,14cyclictest0-21swapper/33
337893899181,14cyclictest0-21swapper/33
337893899181,14cyclictest0-21swapper/33
337893899181,14cyclictest0-21swapper/33
337893899181,14cyclictest0-21swapper/33
337893899181,14cyclictest0-21swapper/33
337893899181,14cyclictest0-21swapper/33
337893899181,13cyclictest0-21swapper/33
337893899181,13cyclictest0-21swapper/33
337893899181,13cyclictest0-21swapper/33
337893899181,13cyclictest0-21swapper/33
3378938991810,5cyclictest3498083-21taskset3
337893899180,2cyclictest0-21swapper/33
37019332171,10sleep20-21swapper/22
35622942171,4sleep13562322-21apt1
35030292175,8sleep23503091-21cat2
34973852171,4sleep23497435-21ntpq2
337893899172,9cyclictest3704275-21taskset3
337893899172,10cyclictest3509580-21taskset3
337893899171,14cyclictest36420552sleep33
337893899171,13cyclictest0-21swapper/33
337893899171,13cyclictest0-21swapper/33
337893899171,13cyclictest0-21swapper/33
337893899170,14cyclictest0-21swapper/33
337893899170,14cyclictest0-21swapper/33
337893899170,14cyclictest0-21swapper/33
337893899170,13cyclictest0-21swapper/33
337893899170,13cyclictest0-21swapper/33
38292632160,9sleep23828738-21apt-get2
36847112161,3sleep03509318-21diskmemload0
36150802161,3sleep20-21swapper/22
35942642161,7sleep13594278-21ssh1
35881162162,8sleep23588150-21munin-run2
35589402161,2sleep20-21swapper/22
35439322161,4sleep13543944-21rm1
35335862160,13sleep03533598-21rm0
35278632161,3sleep23529465-21kthreadcore2
337893899161,13cyclictest0-21swapper/33
337893899161,12cyclictest0-21swapper/33
337893899160,13cyclictest0-21swapper/33
337893899160,13cyclictest0-21swapper/33
337893899160,13cyclictest0-21swapper/33
38364452151,3sleep10-21swapper/11
37723492150,2sleep00-21swapper/00
37534392151,10sleep13753665-21grep1
37455222150,1sleep20-21swapper/22
37285812151,8sleep10-21swapper/11
37203022151,3sleep03509318-21diskmemload0
37100242151,4sleep13509318-21diskmemload1
36776752152,7sleep13677938-21df1
36570842152,3sleep03657099-21ssh0
35686712151,3sleep03509318-21diskmemload0
34450882150,1sleep20-21swapper/22
33968622151,4sleep03396935-21munin-run0
3378938991512,2cyclictest66950irq/132-enp1s0-TxRx-33
337893899150,13cyclictest0-21swapper/33
337893899150,13cyclictest0-21swapper/33
337893899150,13cyclictest0-21swapper/33
337893899150,12cyclictest0-21swapper/33
337893899150,12cyclictest0-21swapper/33
337893899150,12cyclictest0-21swapper/33
337893899150,12cyclictest0-21swapper/33
38780012141,8sleep03509318-21diskmemload0
38641222140,2sleep20-21swapper/22
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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