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2026-06-04 - 02:23

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, 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 rack7slot7s.osadl.org (updated Wed Jun 03, 2026 12:43:50)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
327629776,16sleep30-21swapper/307:05:163
13132950,1sleep30-21swapper/310:10:013
478528867,6sleep10-21swapper/107:09:281
476928875,9sleep00-21swapper/007:09:150
462028875,9sleep20-21swapper/207:07:192
236772820,1sleep323670-21ssh11:20:203
157392690,0sleep10-21swapper/109:59:131
491799340,32cyclictest0-21swapper/211:26:032
4917993228,4cyclictest0-21swapper/210:40:332
491799321,30cyclictest20725-21taskset10:01:332
491799271,25cyclictest10392-21apache_volume10:15:132
491799270,1cyclictest0-21swapper/211:45:232
4917992624,2cyclictest0-21swapper/212:30:232
4917992622,4cyclictest0-21swapper/211:40:232
491799250,24cyclictest0-21swapper/211:10:122
491799250,0cyclictest0-21swapper/210:57:572
491399250,2cyclictest0-21swapper/110:50:021
491799240,24cyclictest0-21swapper/211:51:232
491799240,24cyclictest0-21swapper/210:25:512
491799240,23cyclictest0-21swapper/209:25:332
491999231,1cyclictest0-21swapper/309:05:133
491799231,22cyclictest30207-21ssh12:03:232
491799231,21cyclictest17351-21ssh09:20:332
491799230,23cyclictest0-21swapper/207:56:472
491799230,22cyclictest0-21swapper/211:55:332
4917992219,3cyclictest0-21swapper/210:05:032
4917992219,3cyclictest0-21swapper/209:10:432
4917992218,4cyclictest0-21swapper/211:17:332
4917992218,3cyclictest30136-21diskmemload12:26:132
491799220,22cyclictest0-21swapper/211:09:132
491799220,22cyclictest0-21swapper/210:11:232
491799220,22cyclictest0-21swapper/209:16:032
491799220,21cyclictest30136-21diskmemload10:30:532
4917992118,3cyclictest0-21swapper/212:16:132
4917992117,3cyclictest14564-21ssh12:13:222
491799211,19cyclictest1026-21sensors09:30:222
491799210,21cyclictest0-21swapper/212:20:332
491799210,21cyclictest0-21swapper/212:06:032
491799210,21cyclictest0-21swapper/211:30:132
491799210,21cyclictest0-21swapper/211:02:532
491799210,21cyclictest0-21swapper/210:20:032
491799210,21cyclictest0-21swapper/209:52:432
491399213,10cyclictest0-21swapper/108:00:131
491399213,10cyclictest0-21swapper/108:00:131
491399210,2cyclictest0-21swapper/109:36:391
491399210,20cyclictest0-21swapper/110:55:491
4908992119,1cyclictest0-21swapper/009:30:120
4917992017,3cyclictest0-21swapper/211:36:332
491399200,1cyclictest0-21swapper/112:15:141
490899200,1cyclictest0-21swapper/008:45:140
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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