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2026-06-20 - 01:46

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #8, slot #4

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 rack8slot4s.osadl.org (updated Fri Jun 19, 2026 12:44:39)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
28563132247176,20sleep40-21swapper/407:09:304
28560782242183,49sleep50-21swapper/507:06:095
28561002238168,22sleep70-21swapper/707:06:267
28563362225187,25sleep00-21swapper/007:09:490
28538202225192,22sleep30-21swapper/307:05:023
28561602220185,23sleep20-21swapper/207:07:182
28561352219186,21sleep60-21swapper/607:06:586
28561212218185,22sleep10-21swapper/107:06:441
285656699340,16cyclictest0-21swapper/510:05:205
285656699320,14cyclictest0-21swapper/512:17:065
285656699320,14cyclictest0-21swapper/512:06:075
285656699320,14cyclictest0-21swapper/511:55:095
285656699320,14cyclictest0-21swapper/511:00:145
285656699310,13cyclictest0-21swapper/512:39:055
285656699310,13cyclictest0-21swapper/511:44:105
285656699310,13cyclictest0-21swapper/511:11:145
285656699310,13cyclictest0-21swapper/510:27:175
285656699310,13cyclictest0-21swapper/509:32:235
285656699310,13cyclictest0-21swapper/509:10:245
285656699310,13cyclictest0-21swapper/508:48:275
285656699310,13cyclictest0-21swapper/508:37:275
285656699310,13cyclictest0-21swapper/508:26:285
285656699310,13cyclictest0-21swapper/508:15:305
285656699310,13cyclictest0-21swapper/507:53:315
285656699310,13cyclictest0-21swapper/507:42:335
285656699310,13cyclictest0-21swapper/507:31:345
285656699310,13cyclictest0-21swapper/507:20:345
285656699300,12cyclictest0-21swapper/510:49:165
285656699300,12cyclictest0-21swapper/509:21:245
285656699300,12cyclictest0-21swapper/508:04:305
285656699297,4cyclictest0-21swapper/510:16:185
285656699290,4cyclictest3049000-21ls12:35:005
285656699270,22cyclictest991-21snmpd11:20:125
2856558992726,1cyclictest2939845-21cron09:30:002
2856566992623,1cyclictest2898975-21apt-get08:20:145
285655899260,25cyclictest2925050-21dump-pmu-power09:05:012
285655399260,25cyclictest0-21swapper/009:05:140
285655399260,21cyclictest0-21swapper/009:45:170
285657299250,24cyclictest0-21swapper/709:05:007
285656399250,24cyclictest1-21systemd11:39:594
285656199250,19cyclictest0-21swapper/312:35:203
2856558992520,4cyclictest2945738-21latency_hist09:40:012
285655399250,21cyclictest0-21swapper/007:20:130
2856572992422,1cyclictest3037601-21apt-get12:15:137
285657299240,23cyclictest0-21swapper/712:00:117
285656899240,23cyclictest0-21swapper/611:00:126
285656699240,1cyclictest3011088-21apt-get11:30:115
2856563992423,1cyclictest3044843-21ntpq12:25:174
2856563992420,3cyclictest3422186-21systemd-journal08:30:154
285656399240,23cyclictest2925519-21apt-get09:05:124
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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