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2025-12-10 - 23:15

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 Dec 10, 2025 12:43:46)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
7308210476,10sleep10-21swapper/107:07:031
636229985,9sleep30-21swapper/307:05:213
740128764,6sleep20-21swapper/207:08:172
719328168,9sleep00-21swapper/007:05:330
765199290,1cyclictest0-21swapper/010:42:200
765199282,24cyclictest0-21swapper/012:20:120
765199280,2cyclictest0-21swapper/007:50:150
765199280,27cyclictest0-21swapper/011:13:130
765199280,27cyclictest0-21swapper/009:45:020
7665992726,1cyclictest0-21swapper/312:11:093
765199262,23cyclictest485-21diskmemload10:22:410
765199261,24cyclictest485-21diskmemload12:32:050
765199260,1cyclictest0-21swapper/010:45:300
765199250,24cyclictest0-21swapper/011:18:330
765199250,24cyclictest0-21swapper/010:25:140
765199250,24cyclictest0-21swapper/007:25:010
765199250,19cyclictest0-21swapper/009:59:380
765199241,22cyclictest485-21diskmemload10:04:470
765199240,2cyclictest0-21swapper/011:46:250
765199240,23cyclictest0-21swapper/009:40:190
765199240,1cyclictest0-21swapper/010:56:190
765199232,20cyclictest485-21diskmemload10:12:520
765199232,20cyclictest16067-21cstates11:50:170
765199232,18cyclictest485-21diskmemload11:55:270
765199232,17cyclictest0-21swapper/007:35:210
765199231,22cyclictest485-21diskmemload10:09:140
765199230,22cyclictest25041-21uname10:30:200
765199230,22cyclictest0-21swapper/012:39:110
765199230,22cyclictest0-21swapper/009:36:420
766599220,21cyclictest0-21swapper/311:10:123
765999220,21cyclictest29175-21sh10:34:592
765999220,1cyclictest0-21swapper/212:30:112
765199224,17cyclictest485-21diskmemload10:36:340
765199222,19cyclictest0-21swapper/011:20:150
765199220,21cyclictest485-21diskmemload11:02:310
765199220,21cyclictest0-21swapper/012:28:180
765199220,18cyclictest0-21swapper/010:15:150
765399200,2cyclictest0-21swapper/110:40:211
765199208,11cyclictest500-21in:imuxsock09:17:130
765199200,1cyclictest0-21swapper/011:44:210
765199200,1cyclictest0-21swapper/007:30:190
766599192,16cyclictest472-21avahi-daemon10:50:193
765999190,19cyclictest0-21swapper/212:19:512
7653991918,1cyclictest0-21swapper/111:29:371
765199190,1cyclictest0-21swapper/012:00:530
765199190,1cyclictest0-21swapper/008:55:410
765199190,18cyclictest0-21swapper/008:25:130
765199190,14cyclictest0-21swapper/008:30:140
765199190,12cyclictest0-21swapper/012:10:280
765999182,15cyclictest0-21swapper/211:40:122
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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