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2026-04-15 - 19:04

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #a, 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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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 rackaslot8s.osadl.org (updated Wed Apr 15, 2026 12:45:12)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2941821800,1sleep00-21swapper/010:32:230
2941821800,1sleep00-21swapper/010:32:220
2183421650,1sleep20-21swapper/209:37:582
27799214999,23sleep30-21swapper/307:07:283
276472148127,15sleep00-21swapper/007:05:290
279212140104,25sleep10-21swapper/107:09:031
277662140104,25sleep20-21swapper/207:07:042
148482860,3sleep012-21ksoftirqd/010:45:260
209652690,1sleep00-21swapper/012:04:200
134742650,1sleep10-21swapper/112:22:551
83462630,5sleep334-21ksoftirqd/307:37:063
249132590,2sleep00-21swapper/010:53:540
247112580,2sleep00-21swapper/012:30:450
189112550,2sleep30-21swapper/309:35:233
27842540,1sleep20-21swapper/211:00:372
8852520,4sleep1211rcuc/108:35:011
41792520,4chrt121ksoftirqd/012:15:230
153252490,1sleep10-21swapper/112:00:041
205462480,1sleep10-21swapper/110:00:441
176682480,1sleep00-21swapper/011:12:120
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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