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2025-09-18 - 22:47

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 Thu Sep 18, 2025 12:44:54)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
312013521060,5sleep2331rcuc/211:12:202
311749921040,5sleep10-21swapper/111:05:231
30373932990,6sleep00-21swapper/007:20:010
30780252940,5sleep10-21swapper/109:15:031
30780252940,5sleep10-21swapper/109:15:021
162399940,9rtkit-daemon1622-21rtkit-daemon07:22:192
162399940,72rtkit-daemon0-21swapper/307:09:073
30332252850,12sleep03033216-21sh07:10:000
30547232800,4sleep10-21swapper/108:10:031
303200627751,17sleep20-21swapper/207:05:162
303302927246,16sleep10-21swapper/107:07:561
303333699660,61cyclictest1622-21rtkit-daemon10:41:423
162399660,9rtkit-daemon1622-21rtkit-daemon08:21:033
162399650,8rtkit-daemon1622-21rtkit-daemon12:26:022
162399630,9rtkit-daemon1622-21rtkit-daemon11:28:073
162399630,9rtkit-daemon1622-21rtkit-daemon10:03:453
162399630,9rtkit-daemon1622-21rtkit-daemon07:28:053
162399610,9rtkit-daemon1622-21rtkit-daemon12:03:113
162399610,8rtkit-daemon1622-21rtkit-daemon10:35:172
162399600,9rtkit-daemon1622-21rtkit-daemon08:36:332
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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