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2026-05-15 - 22:58

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, slot #7

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 50 highest latencies:
System rackcslot7s.osadl.org (updated Fri May 15, 2026 12:44:43)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
339524124270,20sleep342-21ksoftirqd/307:05:203
339514323260,11sleep234-21ksoftirqd/207:05:192
346942221260,3sleep30-21swapper/310:35:133
339463126743,15sleep10-21swapper/107:05:101
339607626344,13sleep00-21swapper/007:09:400
34280312490,5sleep30-21swapper/308:35:193
34673222430,4sleep03467311-21munin-run10:30:010
34152112400,4sleep13056-21PK-Backend08:00:131
339626699391,24cyclictest2085813-21snapd09:39:152
3396266993912,17cyclictest1095-21runrttasks08:35:162
339626699371,20cyclictest0-21swapper/211:49:472
339626699363,18cyclictest0-21swapper/208:04:262
339626699363,18cyclictest0-21swapper/207:21:552
339626699362,19cyclictest0-21swapper/208:53:232
339626699361,20cyclictest0-21swapper/212:31:282
339626699361,20cyclictest0-21swapper/210:14:512
339626699361,19cyclictest0-21swapper/209:19:332
339626699353,17cyclictest0-21swapper/210:38:122
339626699353,17cyclictest0-21swapper/210:08:532
339626699352,18cyclictest0-21swapper/211:28:402
339626699352,18cyclictest0-21swapper/210:00:272
339626699351,19cyclictest0-21swapper/211:09:202
339626699351,19cyclictest0-21swapper/208:48:342
339626699351,19cyclictest0-21swapper/208:27:162
339626699351,19cyclictest0-21swapper/207:47:392
339626699346,16cyclictest0-21swapper/209:11:032
339626699344,16cyclictest3418627-21cat08:10:102
339626699343,18cyclictest0-21swapper/210:32:102
339626699343,18cyclictest0-21swapper/209:29:152
339626699343,18cyclictest0-21swapper/208:55:482
339626699343,17cyclictest3472662-21taskset10:43:532
339626699343,17cyclictest0-21swapper/212:25:462
339626699342,18cyclictest0-21swapper/210:27:492
339626699342,18cyclictest0-21swapper/207:52:162
339626699342,17cyclictest0-21swapper/212:14:372
339626699342,17cyclictest0-21swapper/212:00:362
339626699341,20cyclictest0-21swapper/209:08:582
339626699341,19cyclictest0-21swapper/211:42:572
339626699341,19cyclictest0-21swapper/211:42:572
34783342330,2sleep00-21swapper/011:00:120
339626699333,18cyclictest0-21swapper/209:51:492
339626699333,18cyclictest0-21swapper/209:45:562
339626699333,18cyclictest0-21swapper/209:44:322
339626699332,19cyclictest0-21swapper/211:23:562
339626699332,18cyclictest0-21swapper/208:15:382
339626699332,18cyclictest0-21swapper/207:10:292
339626699331,20cyclictest0-21swapper/210:59:252
339626699324,16cyclictest0-21swapper/207:15:272
339626699322,19cyclictest0-21swapper/210:16:322
339626699322,18cyclictest0-21swapper/212:22:222
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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