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2026-03-20 - 03:14

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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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

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 Fri Mar 20, 2026 00:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
283887321340,2sleep22838878-21kthreadcore2
2683566211952,63sleep30-21swapper/33
299746921090,3sleep12997314-21ssh1
268847428365,12sleep20-21swapper/22
268834028252,11sleep10-21swapper/11
268374827954,15sleep00-21swapper/00
30168282232,7sleep13016904-21ntpq1
268867899221,13cyclictest0-21swapper/33
268867899211,16cyclictest3105621-21chrt3
268867899211,16cyclictest3010734-21taskset3
29476722203,2sleep22818990-21diskmemload2
28322342201,5sleep02832290-21ntpq0
28322342201,5sleep02832290-21ntpq0
268867899203,12cyclictest2977378-21taskset3
268867899201,16cyclictest0-21swapper/33
268867899201,15cyclictest66950irq/132-enp1s0-TxRx-33
268867899201,15cyclictest3053101-21taskset3
268867899201,15cyclictest2887013-21taskset3
268867899201,15cyclictest0-21swapper/33
268867899191,15cyclictest0-21swapper/33
268867899191,15cyclictest0-21swapper/33
268867899191,14cyclictest66950irq/132-enp1s0-TxRx-33
268867899191,14cyclictest3158174-21chrt3
268867899191,14cyclictest0-21swapper/33
268867899191,14cyclictest0-21swapper/33
268867899191,14cyclictest0-21swapper/33
268867899191,14cyclictest0-21swapper/33
268867899191,14cyclictest0-21swapper/33
268867899191,14cyclictest0-21swapper/33
2688678991910,7cyclictest2872412-21chrt3
31256662181,3sleep00-21swapper/00
30109142181,7sleep12818990-21diskmemload1
29666582181,2sleep20-21swapper/22
29026892182,11sleep12898489-21/usr/sbin/munin1
28670942181,4sleep02867246-21ntpq0
28020772181,11sleep02802131-21ntpq0
268867899188,7cyclictest3151768-21taskset3
268867899187,4cyclictest2892580-21chrt3
2688678991815,1cyclictest0-21swapper/33
2688678991815,1cyclictest0-21swapper/33
2688678991812,3cyclictest0-21swapper/33
268867899181,14cyclictest0-21swapper/33
268867899181,14cyclictest0-21swapper/33
268867899181,14cyclictest0-21swapper/33
268867899181,14cyclictest0-21swapper/33
268867899181,14cyclictest0-21swapper/33
268867899181,14cyclictest0-21swapper/33
268867899181,14cyclictest0-21swapper/33
268867899181,14cyclictest0-21swapper/33
268867899181,14cyclictest0-21swapper/33
268867899181,14cyclictest0-21swapper/33
268867899181,13cyclictest0-21swapper/33
268867899181,13cyclictest0-21swapper/33
268867899181,13cyclictest0-21swapper/33
268867899181,13cyclictest0-21swapper/33
268867899180,14cyclictest0-21swapper/33
31584592176,2sleep2171rcu_preempt2
30133282171,12sleep23013361-21kthreadcore2
29767672170,12sleep22818990-21diskmemload2
28595392170,1sleep20-21swapper/22
2688678991713,2cyclictest0-21swapper/33
268867899171,13cyclictest0-21swapper/33
268867899171,13cyclictest0-21swapper/33
268867899171,13cyclictest0-21swapper/33
268867899171,12cyclictest0-21swapper/33
268867899170,14cyclictest0-21swapper/33
268867899170,14cyclictest0-21swapper/33
268867899170,13cyclictest0-21swapper/33
31759662161,2sleep20-21swapper/22
30636042161,2sleep20-21swapper/22
30368812161,2sleep00-21swapper/00
30199592161,2sleep00-21swapper/00
29386262161,4sleep22818990-21diskmemload2
268867899162,9cyclictest2748310-21taskset3
268867899161,9cyclictest2792677-21taskset3
268867899160,14cyclictest0-21swapper/33
268867899160,13cyclictest0-21swapper/33
268867899160,13cyclictest0-21swapper/33
268867899160,13cyclictest0-21swapper/33
268867899160,12cyclictest0-21swapper/33
31590412151,8sleep00-21swapper/00
30911352151,3sleep03091139-21ssh0
29588572151,9sleep12818990-21diskmemload1
28948942152,8sleep12818990-21diskmemload1
28773062151,3sleep12818990-21diskmemload1
28182812151,6sleep12818506-21tail1
27644402151,9sleep22764487-21ntpq2
27497172150,2sleep10-21swapper/11
268867899157,4cyclictest2701547-21taskset3
2688678991513,1cyclictest0-21swapper/33
2688678991512,1cyclictest0-21swapper/33
268867899150,13cyclictest0-21swapper/33
268867899150,13cyclictest0-21swapper/33
268867899150,13cyclictest0-21swapper/33
268867899150,12cyclictest0-21swapper/33
268867899150,12cyclictest0-21swapper/33
31166422141,2sleep10-21swapper/11
31075302141,2sleep00-21swapper/00
31067442141,8sleep12818990-21diskmemload1
30034272147,4sleep22688673-21cyclictest2
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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