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2026-07-17 - 23:03

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 100 highest latencies:
System rack8slot4s.osadl.org (updated Fri Jul 17, 2026 12:44:41)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
31043222243171,22sleep70-21swapper/707:08:237
31042902231169,50sleep20-21swapper/207:07:532
31043282222190,21sleep40-21swapper/407:08:274
31041882220181,25sleep30-21swapper/307:06:253
31041762215180,23sleep00-21swapper/007:06:140
31041252215178,24sleep50-21swapper/507:05:305
31019172215183,21sleep60-21swapper/607:05:086
31042512211181,20sleep10-21swapper/107:07:191
310466699260,4cyclictest3235020-21idleruntime-cro10:50:007
310465599260,25cyclictest3226191-21awk10:35:003
310465599260,24cyclictest3252741-21perf11:20:003
310466699250,24cyclictest3255691-21ls11:25:007
310466199250,25cyclictest3148291-21ntpq08:20:196
310465799252,22cyclictest3104640-21cyclictest09:35:134
3104655992523,1cyclictest0-21swapper/312:05:113
310465599250,24cyclictest0-21swapper/308:15:143
310465099250,24cyclictest3143633-21perf08:15:002
310466699240,3cyclictest3248603-21ntpq11:10:207
310466699240,23cyclictest3188296-21apt-get09:30:127
310466199240,23cyclictest3155846-21taskset08:35:126
310466099240,23cyclictest3229115-21apt10:40:015
3104655992423,1cyclictest3211868-21apt-get10:10:133
310465099240,23cyclictest0-21swapper/207:40:132
310464999240,1cyclictest3170627-21apt-get09:00:121
310464699240,23cyclictest3191240-21apt-get09:35:120
310466699230,2cyclictest3202583-21apt09:55:007
310466699230,23cyclictest0-21swapper/709:00:007
310466699230,22cyclictest0-21swapper/708:50:037
310466699230,1cyclictest0-21swapper/709:55:147
310466199230,23cyclictest3152459-21cron08:29:596
310466199230,1cyclictest3235447-21apt-get10:50:136
3104660992322,1cyclictest3138176-21apt-get08:05:155
3104660992321,1cyclictest3183715-21ntpq09:20:185
3104660992321,1cyclictest0-21swapper/508:45:115
310466099230,22cyclictest0-21swapper/510:50:135
310466099230,22cyclictest0-21swapper/510:00:115
310466099230,22cyclictest0-21swapper/509:00:145
3104657992322,1cyclictest0-21swapper/412:25:124
310465799230,22cyclictest3120462-21apt-get07:35:124
310465799230,22cyclictest0-21swapper/410:00:184
310465799230,22cyclictest0-21swapper/407:55:134
310465799230,1cyclictest3214400-21basename10:15:004
310465799230,1cyclictest0-21swapper/411:00:194
310465599230,22cyclictest3117106-21idleruntime-cro07:30:013
310465599230,22cyclictest0-21swapper/311:20:143
310465599230,22cyclictest0-21swapper/311:00:123
310465599230,22cyclictest0-21swapper/309:25:183
3104650992323,0cyclictest0-21swapper/208:40:142
3104650992322,1cyclictest3259068-21apt-get11:30:142
310465099230,23cyclictest3282256-21ls12:10:002
310465099230,22cyclictest0-21swapper/211:50:112
310465099230,22cyclictest0-21swapper/211:40:122
310465099230,22cyclictest0-21swapper/210:50:142
310465099230,22cyclictest0-21swapper/210:25:132
310465099230,22cyclictest0-21swapper/210:15:142
310465099230,22cyclictest0-21swapper/210:15:132
310465099230,22cyclictest0-21swapper/207:35:132
3104649992319,3cyclictest3164683-21apt-get08:50:041
310464999230,22cyclictest3147017-21apt-get08:20:111
310464999230,22cyclictest0-21swapper/112:30:111
310464999230,1cyclictest0-21swapper/107:30:001
3104646992322,1cyclictest3288168-21readlink12:20:000
3104646992321,1cyclictest3123004-21munin-run07:40:000
3104646992318,4cyclictest3272226-21grep11:50:170
310464699230,23cyclictest3242761-21ntpq11:00:200
310464699230,23cyclictest3187864-21idleruntime-cro09:30:010
310464699230,23cyclictest0-21swapper/010:15:000
310464699230,22cyclictest3279711-21/usr/sbin/munin12:05:180
310464699230,22cyclictest3182409-21apt-get09:20:130
3104666992222,0cyclictest0-21swapper/709:15:147
3104666992221,1cyclictest3257440-21ntpq11:25:187
3104666992221,1cyclictest3227929-21grep10:35:187
310466699220,22cyclictest0-21swapper/710:20:207
310466699220,22cyclictest0-21swapper/710:20:197
310466699220,22cyclictest0-21swapper/708:20:007
310466699220,21cyclictest3244331-21apt-get11:05:137
310466699220,21cyclictest3141111-21apt-get08:10:117
310466699220,21cyclictest3135233-21apt-get08:00:137
310466699220,21cyclictest0-21swapper/710:30:137
310466699220,21cyclictest0-21swapper/710:15:137
310466699220,21cyclictest0-21swapper/710:15:137
310466699220,21cyclictest0-21swapper/710:00:127
310466699220,21cyclictest0-21swapper/709:45:147
310466699220,21cyclictest0-21swapper/707:40:137
310466699220,1cyclictest0-21swapper/708:10:007
310466699220,1cyclictest0-21swapper/707:55:207
310466699220,0cyclictest0-21swapper/709:05:137
3104661992222,0cyclictest0-21swapper/612:35:126
3104661992221,1cyclictest3179447-21apt-get09:15:136
3104661992221,1cyclictest3120041-21munin-run07:35:006
3104661992220,1cyclictest3200077-21apt-get09:50:116
3104661992220,1cyclictest0-21swapper/610:55:136
310466199220,22cyclictest3208930-21apt-get10:05:146
310466199220,22cyclictest3123023-21awk07:40:006
310466199220,22cyclictest3111216-21perf07:20:006
310466199220,22cyclictest0-21swapper/607:45:136
310466199220,21cyclictest3205986-21apt-get10:00:116
310466199220,1cyclictest3256117-21apt-get11:25:116
310466199220,1cyclictest3161752-21apt-get08:45:116
310466199220,1cyclictest0-21swapper/610:20:186
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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