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2025-11-03 - 17:51

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, slot #7

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 20 highest latencies:
System rackcslot7s.osadl.org (updated Mon Nov 03, 2025 12:44:54)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
162399990,9rtkit-daemon1622-21rtkit-daemon12:37:050
41832132940,6sleep30-21swapper/311:45:323
41542592920,6sleep04154254-21hddtemp_smartct10:25:220
40888972920,6sleep00-21swapper/007:20:160
41393782880,12sleep04084480-21cyclictest09:45:010
408413128167,9sleep20-21swapper/207:07:442
41417952800,5sleep02197014-21PK-Backend09:50:220
41417952800,5sleep02197014-21PK-Backend09:50:210
408422327939,13sleep10-21swapper/107:08:551
408448699782,71cyclictest1622-21rtkit-daemon09:55:200
162399710,42rtkit-daemon0-21swapper/107:46:551
408409526748,13sleep30-21swapper/307:07:163
162399660,32rtkit-daemon1753-21gnome-shell10:43:493
162399650,8rtkit-daemon1622-21rtkit-daemon09:29:461
408283226347,9sleep00-21swapper/007:05:080
41591952610,14sleep1251rcuc/110:40:161
162399610,8rtkit-daemon1622-21rtkit-daemon11:56:422
408449299601,28cyclictest4106658-21expr08:10:182
162399600,36rtkit-daemon0-21swapper/108:35:441
4084492995918,11cyclictest4155779-21tr10:30:132
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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