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2025-10-19 - 05:38

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, 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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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 rack3slot3s.osadl.org (updated Sun Oct 19, 2025 00:43:56)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
21797422149101,16sleep30-21swapper/319:09:243
21796452149114,28sleep00-21swapper/019:08:080
21797452147101,16sleep10-21swapper/119:09:261
21795022145100,15sleep20-21swapper/219:06:232
218764921290,2sleep00-21swapper/019:15:160
254309821070,3sleep2411rcuc/223:40:092
2179908993631,3cyclictest720-21tpm2-abrmd20:00:003
2179908993223,6cyclictest2487219-21grep23:05:143
2179908993220,9cyclictest736-21gdbus21:35:003
2179908993021,6cyclictest2448284-21cut22:40:173
24549742270,2sleep20-21swapper/222:45:142
2179908992723,3cyclictest726-21in:imuxsock00:10:003
2179908992715,10cyclictest2191744-21idleruntime-cro19:20:003
2179908992622,3cyclictest2574557-21sh00:00:003
2179908992621,3cyclictest2617918-21needreboot00:25:193
2179908992621,3cyclictest2216841-21turbostat19:45:003
2179908992621,3cyclictest2216841-21turbostat19:45:003
217990899257,17cyclictest0-21swapper/321:10:233
2179908992519,3cyclictest0-21swapper/321:40:133
2179908992517,5cyclictest2367830-21diskmemload21:50:183
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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