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2026-09-20 - 06:50

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 Sun Sep 20, 2026 00:44:42)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
27450932237171,53sleep30-21swapper/319:08:593
27450932237171,53sleep30-21swapper/319:08:593
27450642228200,18sleep10-21swapper/119:08:321
27450642228200,18sleep10-21swapper/119:08:321
27450602225164,19sleep60-21swapper/619:08:296
27450602225164,19sleep60-21swapper/619:08:286
27449582225187,25sleep70-21swapper/719:07:017
27449582225187,25sleep70-21swapper/719:07:017
27449002224186,25sleep00-21swapper/019:06:140
27449002224186,25sleep00-21swapper/019:06:140
27450002223163,51sleep20-21swapper/219:07:372
27450002223163,51sleep20-21swapper/219:07:372
27449832221181,26sleep50-21swapper/519:07:235
27449832221181,26sleep50-21swapper/519:07:235
27450382216184,22sleep40-21swapper/419:08:104
27450382216184,22sleep40-21swapper/419:08:104
27963852610,0sleep40-21swapper/420:35:014
274537299343,18cyclictest0-21swapper/222:42:352
274537299270,26cyclictest2864465-21apt-get22:30:122
2745383992625,1cyclictest2848074-21ntpq22:00:166
274538099260,25cyclictest2896553-21ls23:25:015
274538099260,25cyclictest2852247-21idleruntime-cro22:10:005
274537899260,25cyclictest2760749-21dump-pmu-power19:35:014
2745383992524,1cyclictest0-21swapper/622:25:116
274538399250,24cyclictest0-21swapper/620:25:166
274538099250,24cyclictest2864049-21awk22:29:595
274537899250,24cyclictest2905404-21idleruntime-cro23:40:004
274537899250,1cyclictest0-21swapper/423:25:184
274537499250,25cyclictest2762498-21taskset19:35:193
274536799250,2cyclictest2825710-21awk21:25:000
274538099240,24cyclictest0-21swapper/520:35:015
2745374992422,1cyclictest2911313-21idleruntime-cro23:50:003
274537299240,24cyclictest2808008-21idleruntime-cro20:55:012
274537299240,23cyclictest0-21swapper/223:35:122
2745370992419,4cyclictest2805053-21munin-plugin-st20:50:011
274537099240,24cyclictest2881753-21munin-run22:59:591
274537099240,23cyclictest0-21swapper/121:55:181
274537099240,1cyclictest2767086-21apt-get19:45:161
2745367992420,3cyclictest2941597-21tr00:40:000
2745367992419,4cyclictest2869924-21dump-pmu-power22:40:000
274536799240,23cyclictest0-21swapper/020:10:110
2745384992322,1cyclictest0-21swapper/721:55:127
274538499230,22cyclictest0-21swapper/723:40:127
274538499230,1cyclictest2765520-21sh19:40:217
2745383992322,0cyclictest0-21swapper/600:00:216
2745383992321,1cyclictest2790260-21idleruntime-cro20:25:016
2745383992321,1cyclictest0-21swapper/620:00:196
274538399230,22cyclictest0-21swapper/623:25:126
274538399230,22cyclictest0-21swapper/622:20:126
274538399230,22cyclictest0-21swapper/622:10:226
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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