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2026-05-24 - 15:40

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 Sun May 24, 2026 12:45:12)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
42232206104,27sleep20-21swapper/207:06:312
42222184170,8sleep10-21swapper/107:06:291
41942172101,25sleep00-21swapper/007:06:080
44892171106,28sleep30-21swapper/307:09:563
1335021240,2sleep10-21swapper/112:15:241
200872810,1sleep10-21swapper/107:45:001
276172640,1sleep30-21swapper/310:00:183
11732580,2sleep334-21ksoftirqd/310:54:113
210572550,2sleep10-21swapper/111:57:071
210572550,2sleep10-21swapper/111:57:061
212152530,1sleep20-21swapper/209:00:212
257282520,2sleep00-21swapper/011:35:580
307332460,1sleep00-21swapper/012:29:150
212472460,3sleep1211rcuc/112:21:211
124412460,2sleep10-21swapper/109:25:051
91942450,1sleep10-21swapper/108:35:011
82312410,1sleep20-21swapper/212:11:402
303612400,3sleep122-21ksoftirqd/112:04:451
274362320,3sleep10-21swapper/108:00:181
232772300,1sleep20-21swapper/211:10:192
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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