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2026-04-13 - 19:37

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #5

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 rackeslot5s.osadl.org (updated Mon Apr 13, 2026 12:44:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
29466992624,1cyclictest8518-21cron12:35:000
2948099250,24cyclictest8525-21cron12:35:003
2948099250,24cyclictest0-21swapper/311:40:363
2948099250,24cyclictest0-21swapper/310:11:153
2947699250,24cyclictest0-21swapper/211:56:522
2947699250,24cyclictest0-21swapper/210:58:412
2947699250,1cyclictest0-21swapper/212:11:042
2946699250,24cyclictest23210-21diskmemload09:23:110
2946699250,24cyclictest0-21swapper/009:34:560
29480992422,1cyclictest23210-21diskmemload10:34:373
29480992421,2cyclictest26358-21ssh10:47:063
2948099240,23cyclictest5807-21diskmemload12:00:443
2948099240,23cyclictest23210-21diskmemload09:48:213
2948099240,1cyclictest23210-21diskmemload10:58:533
29476992422,2cyclictest6646-21diskmemload11:29:482
2947699240,3cyclictest31291-21perf10:20:002
2947699240,24cyclictest0-21swapper/210:50:422
2947699240,23cyclictest25662-21sendmail-msp12:20:012
2947699240,23cyclictest23210-21diskmemload12:32:402
2947699240,23cyclictest23210-21diskmemload10:43:012
2947699240,23cyclictest23210-21diskmemload10:38:592
2947699240,23cyclictest23210-21diskmemload09:31:092
2947699240,23cyclictest23210-21diskmemload09:14:162
2947699240,23cyclictest0-21swapper/211:37:462
2947699240,1cyclictest24086-21apt-get10:14:302
2947699240,1cyclictest0-21swapper/212:24:322
29472992420,3cyclictest21601-21munin-run08:00:011
2947299241,22cyclictest22-21ksoftirqd/109:33:391
2947299240,24cyclictest23210-21diskmemload09:52:581
2947299240,24cyclictest0-21swapper/110:34:341
2947299240,24cyclictest0-21swapper/109:48:151
2947299240,23cyclictest0-21swapper/111:14:081
2947299240,1cyclictest23210-21diskmemload11:29:411
2947299240,0cyclictest0-21swapper/109:43:551
2946699240,2cyclictest27765-21rm10:17:150
2946699240,24cyclictest23210-21diskmemload11:33:060
2946699240,24cyclictest0-21swapper/010:02:420
2946699240,23cyclictest25602-21ssh12:20:010
29480992323,0cyclictest23210-21diskmemload11:12:093
29480992323,0cyclictest0-21swapper/311:25:273
29480992323,0cyclictest0-21swapper/311:21:053
29480992323,0cyclictest0-21swapper/311:06:253
29480992323,0cyclictest0-21swapper/309:54:033
29480992323,0cyclictest0-21swapper/309:18:363
29480992321,1cyclictest0-21swapper/311:30:433
29480992321,1cyclictest0-21swapper/310:15:243
29480992321,1cyclictest0-21swapper/309:39:173
2948099230,2cyclictest18119-21rm10:39:343
2948099230,23cyclictest0-21swapper/312:19:203
2948099230,23cyclictest0-21swapper/312:13:193
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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