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2025-11-09 - 01:47

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #8

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 here to display the system's profile data.
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 rackeslot8s.osadl.org (updated Sat Nov 08, 2025 12:43:54)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1208059991916,1cyclictest0-21swapper/311:55:013
1208059991715,1cyclictest0-21swapper/312:10:173
1208059991714,1cyclictest0-21swapper/312:20:213
1208059991714,1cyclictest0-21swapper/311:30:013
1208059991714,1cyclictest0-21swapper/309:45:003
1208059991714,1cyclictest0-21swapper/309:10:013
1208059991714,1cyclictest0-21swapper/309:10:003
120805999161,5cyclictest15094302sleep310:45:123
1208059991613,1cyclictest0-21swapper/312:30:173
1208059991613,1cyclictest0-21swapper/309:50:183
1208059991613,1cyclictest0-21swapper/309:20:133
120805999159,3cyclictest1676147-21turbostat12:30:003
1208059991513,1cyclictest0-21swapper/308:50:223
1208059991512,1cyclictest0-21swapper/311:00:193
1208059991512,1cyclictest0-21swapper/307:41:353
16858542140,1sleep01687209-21kthreadcore12:35:190
12968882142,4sleep21296920-21apt-get08:20:142
1208059991412,1cyclictest0-21swapper/309:10:193
1208059991411,1cyclictest0-21swapper/311:20:193
1208059991411,1cyclictest0-21swapper/311:15:003
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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