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2026-04-12 - 15:52

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 Sun Apr 12, 2026 12:44:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
154361421120,4sleep33056-21PK-Backend10:20:173
14742662950,5sleep30-21swapper/307:05:243
139099840,74rtkit-daemon0-21swapper/107:09:411
15164882800,4sleep20-21swapper/209:05:142
147479826445,13sleep20-21swapper/207:09:272
147475026344,14sleep00-21swapper/007:08:520
15254152440,5sleep10-21swapper/109:30:121
147497699388,8cyclictest883-21dbus-daemon08:00:011
139099350,4rtkit-daemon1788643-21eadedCompositor10:43:390
147497699318,9cyclictest1519830-21taskset09:15:031
147497699316,13cyclictest1535372-21seq09:59:101
147497699304,10cyclictest1582356-21seq12:12:461
147497699297,12cyclictest1540531-21taskset10:13:371
1474972992911,3cyclictest13-21ksoftirqd/009:45:170
147497699286,10cyclictest0-21swapper/110:15:181
147497699285,13cyclictest0-21swapper/110:28:011
147497699285,10cyclictest1551196-21seq10:43:281
147497699285,10cyclictest1518965-21seq09:10:251
147497699284,9cyclictest1585544-21cat12:20:211
147497699276,8cyclictest1566948-21munin-run11:30:001
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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