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2026-03-14 - 01:08

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 Fri Mar 13, 2026 12:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1711220212468,52sleep30-21swapper/33
171112528263,12sleep10-21swapper/11
171120428051,11sleep20-21swapper/22
171118227953,18sleep00-21swapper/00
171150499226,12cyclictest2130531-21taskset3
1711504992218,2cyclictest0-21swapper/33
171150499211,16cyclictest66950irq/132-enp1s0-TxRx-33
22087592201,9sleep11842393-21diskmemload1
171150499205,12cyclictest0-21swapper/33
171150499201,15cyclictest1716642-21taskset3
171150499201,15cyclictest0-21swapper/33
171150499201,12cyclictest0-21swapper/33
19893802191,4sleep00-21swapper/00
1711504991917,1cyclictest0-21swapper/33
1711504991917,1cyclictest0-21swapper/33
1711504991916,1cyclictest0-21swapper/33
1711504991915,2cyclictest0-21swapper/33
1711504991915,2cyclictest0-21swapper/33
1711504991911,7cyclictest0-21swapper/33
171150499191,15cyclictest0-21swapper/33
171150499191,15cyclictest0-21swapper/33
171150499191,14cyclictest0-21swapper/33
171150499191,14cyclictest0-21swapper/33
171150499191,14cyclictest0-21swapper/33
171150499191,14cyclictest0-21swapper/33
171150499191,14cyclictest0-21swapper/33
1711504991910,6cyclictest2050488-21taskset3
171150499190,12cyclictest0-21swapper/33
21199522180,3sleep10-21swapper/11
19969152181,3sleep20-21swapper/22
171150499181,6cyclictest1783201-21taskset3
171150499181,5cyclictest0-21swapper/33
1711504991815,1cyclictest0-21swapper/33
1711504991814,2cyclictest0-21swapper/33
1711504991813,2cyclictest0-21swapper/33
1711504991812,3cyclictest0-21swapper/33
171150499181,14cyclictest0-21swapper/33
171150499181,14cyclictest0-21swapper/33
171150499181,14cyclictest0-21swapper/33
171150499181,14cyclictest0-21swapper/33
171150499181,14cyclictest0-21swapper/33
171150499181,14cyclictest0-21swapper/33
171150499181,14cyclictest0-21swapper/33
171150499181,13cyclictest0-21swapper/33
171150499181,13cyclictest0-21swapper/33
171150499181,13cyclictest0-21swapper/33
171150499181,13cyclictest0-21swapper/33
171150499180,14cyclictest1799482-21sleep3
20858512171,3sleep20-21swapper/22
19376962171,2sleep00-21swapper/00
171150499172,11cyclictest2092402-21taskset3
1711504991713,2cyclictest0-21swapper/33
1711504991713,2cyclictest0-21swapper/33
1711504991713,2cyclictest0-21swapper/33
171150499171,14cyclictest0-21swapper/33
171150499171,14cyclictest0-21swapper/33
171150499171,13cyclictest0-21swapper/33
171150499170,14cyclictest0-21swapper/33
21736662161,2sleep00-21swapper/00
19893122160,1sleep20-21swapper/22
19449292160,5sleep11842393-21diskmemload1
19179732161,10sleep11842393-21diskmemload1
171150499168,4cyclictest1794205-21sleep3
171150499161,3cyclictest0-21swapper/33
1711504991613,1cyclictest0-21swapper/33
171150499160,13cyclictest0-21swapper/33
171150499160,13cyclictest0-21swapper/33
171150499160,12cyclictest0-21swapper/33
22105702151,10sleep02210585-21ssh0
19655172151,8sleep21842393-21diskmemload2
19370992151,3sleep11842393-21diskmemload1
18469522151,9sleep11847018-21ntpq1
18221452151,3sleep20-21swapper/22
171150499158,4cyclictest1723750-21chrt3
1711504991512,2cyclictest0-21swapper/33
1711504991512,1cyclictest0-21swapper/33
171150499150,13cyclictest0-21swapper/33
171150499150,12cyclictest0-21swapper/33
171150499150,12cyclictest0-21swapper/33
171150499150,12cyclictest0-21swapper/33
21504262145,6sleep2431ktimers/22
21130692141,2sleep21842393-21diskmemload2
21009902142,5sleep12101049-21ntpq1
20953142141,8sleep11842393-21diskmemload1
20945952140,3sleep01842393-21diskmemload0
20864892141,7sleep11842393-21diskmemload1
20592552141,9sleep22059269-21ssh2
20172412140,2sleep20-21swapper/22
20077432141,8sleep11842393-21diskmemload1
19747032141,8sleep01976141-21cut0
19653222141,5sleep11965516-21expr1
19619092141,3sleep01961921-21ssh0
19035952141,9sleep21903774-21cut2
18929382140,11sleep01892952-21ssh0
18673392141,4sleep01867351-21ssh0
18593772141,4sleep21859388-21ssh2
18570662141,7sleep11842393-21diskmemload1
18366342140,1sleep20-21swapper/22
18157032141,3sleep21815722-21apt-get2
1711504991412,1cyclictest0-21swapper/33
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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