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2025-09-17 - 15:53

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, 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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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 rack5slot3s.osadl.org (updated Wed Sep 17, 2025 12:44:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
138802240162,24sleep00-21swapper/007:06:380
140912239163,25sleep30-21swapper/307:09:233
141422229153,24sleep20-21swapper/207:09:582
121822207168,26sleep10-21swapper/107:05:101
14246999482,7cyclictest0-21swapper/211:35:472
150112620,3sleep10-21swapper/107:10:161
261902550,1sleep011-21rcuc/011:15:150
174242490,4sleep20-21swapper/209:40:232
174242490,4sleep20-21swapper/209:40:232
14246994946,2cyclictest0-21swapper/212:25:132
1425199391,12cyclictest0-21swapper/311:54:003
1425199391,12cyclictest0-21swapper/311:54:003
1425199372,13cyclictest0-21swapper/311:13:243
1425199370,25cyclictest0-21swapper/310:11:143
14251993620,8cyclictest0-21swapper/310:38:323
1425199359,9cyclictest0-21swapper/312:20:423
1425199351,14cyclictest0-21swapper/309:17:403
1425199343,11cyclictest0-21swapper/310:29:403
1424199340,4cyclictest0-21swapper/112:23:531
1423799348,12cyclictest18380-21awk09:45:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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