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2026-03-19 - 13:13

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 Thu Mar 19, 2026 00:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
287622212262,56sleep30-21swapper/33
28752128962,10sleep20-21swapper/22
28768928051,12sleep10-21swapper/11
28748127654,16sleep00-21swapper/00
28785899232,16cyclictest0-21swapper/33
28785899221,18cyclictest0-21swapper/33
28785899221,18cyclictest0-21swapper/33
28785899211,8cyclictest0-21swapper/33
287858992112,5cyclictest6474352sleep33
28785899211,16cyclictest66950irq/132-enp1s0-TxRx-33
7263632201,4sleep20-21swapper/22
4882162200,5sleep2171rcu_preempt2
4441162202,9sleep2424687-21kworker/2:1+mm_percpu_wq2
4441162202,9sleep2424687-21kworker/2:1+mm_percpu_wq2
28785899204,12cyclictest434892-21taskset3
28785899202,14cyclictest412766-21turbostat3
287858992017,1cyclictest0-21swapper/33
28785899201,15cyclictest0-21swapper/33
28785899201,15cyclictest0-21swapper/33
28785899200,16cyclictest628335-21taskset3
4586412190,2sleep20-21swapper/22
28785899195,12cyclictest0-21swapper/33
287858991916,1cyclictest0-21swapper/33
287858991912,5cyclictest0-21swapper/33
28785899191,15cyclictest0-21swapper/33
28785899191,15cyclictest0-21swapper/33
28785899191,15cyclictest0-21swapper/33
28785899191,15cyclictest0-21swapper/33
28785899191,15cyclictest0-21swapper/33
28785899191,14cyclictest0-21swapper/33
28785899191,14cyclictest0-21swapper/33
28785899191,14cyclictest0-21swapper/33
28785899191,14cyclictest0-21swapper/33
28785899191,14cyclictest0-21swapper/33
6699322181,2sleep00-21swapper/00
5505522181,3sleep20-21swapper/22
28785899181,14cyclictest0-21swapper/33
28785899181,14cyclictest0-21swapper/33
28785899181,14cyclictest0-21swapper/33
28785899181,14cyclictest0-21swapper/33
28785899181,14cyclictest0-21swapper/33
28785899181,14cyclictest0-21swapper/33
28785899181,14cyclictest0-21swapper/33
28785899181,14cyclictest0-21swapper/33
28785899181,14cyclictest0-21swapper/33
28785899181,13cyclictest664909-21taskset3
28785899181,13cyclictest0-21swapper/33
28785899181,13cyclictest0-21swapper/33
28785899181,13cyclictest0-21swapper/33
28785899181,13cyclictest0-21swapper/33
28785899180,5cyclictest5046352sleep33
28785899180,16cyclictest0-21swapper/33
6901762171,3sleep10-21swapper/11
6562292171,2sleep00-21swapper/00
6554342172,2sleep10-21swapper/11
6449172171,3sleep20-21swapper/22
6367582171,2sleep20-21swapper/22
4840462171,8sleep1484491-21/usr/sbin/munin1
4421222171,2sleep10-21swapper/11
4421222171,2sleep10-21swapper/11
28785899177,6cyclictest369858-21turbostat3
28785899171,14cyclictest0-21swapper/33
28785899171,14cyclictest0-21swapper/33
28785899171,13cyclictest0-21swapper/33
28785899171,13cyclictest0-21swapper/33
28785899171,13cyclictest0-21swapper/33
28785899170,14cyclictest0-21swapper/33
28785899170,13cyclictest0-21swapper/33
7600922161,4sleep2418093-21diskmemload2
7091132161,4sleep1709334-21hddtemp_smartct1
6759812161,4sleep1418093-21diskmemload1
6726432161,3sleep20-21swapper/22
5233142160,1sleep20-21swapper/22
4785152161,3sleep00-21swapper/00
4347602161,3sleep1418093-21diskmemload1
28785899162,10cyclictest532834-21taskset3
28785899160,13cyclictest0-21swapper/33
28785899160,13cyclictest0-21swapper/33
28785899160,13cyclictest0-21swapper/33
28785899160,13cyclictest0-21swapper/33
28785899160,12cyclictest0-21swapper/33
28785899160,12cyclictest0-21swapper/33
7344112156,3sleep1418093-21diskmemload1
5917322150,3sleep20-21swapper/22
5287712151,10sleep2529041-21grep2
5159602151,4sleep1516048-21irqstats1
4805202151,9sleep0480735-21diskstats0
28785899152,8cyclictest306064-21taskset3
28785899152,8cyclictest306064-21taskset3
28785899151,11cyclictest0-21swapper/33
28785899150,13cyclictest0-21swapper/33
28785899150,12cyclictest0-21swapper/33
28785899150,12cyclictest0-21swapper/33
28785899150,12cyclictest0-21swapper/33
5861652141,9sleep0586386-21hddtemp_smartct0
5857322141,7sleep1418093-21diskmemload1
5596142140,2sleep20-21swapper/22
5318542141,8sleep1418093-21diskmemload1
5047572140,2sleep00-21swapper/00
4936762140,4sleep1493720-21ssh1
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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