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2025-11-19 - 18:42

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 Wed Nov 19, 2025 12:44:47)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
40692362232167,22sleep30-21swapper/307:05:133
40716112226170,17sleep00-21swapper/007:09:050
40714992223170,18sleep60-21swapper/607:07:346
40714022213176,24sleep10-21swapper/107:06:081
40714462212178,22sleep70-21swapper/707:06:477
40716332209178,20sleep40-21swapper/407:09:244
40716222209176,21sleep20-21swapper/207:09:142
40713972209176,22sleep50-21swapper/507:06:035
407190999280,23cyclictest4115943-21grep08:25:007
407189099260,25cyclictest2970800-21systemd-journal12:40:012
4071909992525,0cyclictest0-21swapper/710:10:137
407190099250,24cyclictest0-21swapper/511:50:155
407189599250,24cyclictest4096348-21apt07:50:124
4071894992520,4cyclictest4139707-21apt-get09:05:013
4071894992519,5cyclictest4083955-21munin-run07:30:013
407189499250,24cyclictest0-21swapper/307:20:143
407188899250,24cyclictest0-21swapper/111:50:151
4071884992521,3cyclictest4107351-21apt08:10:010
407190999240,23cyclictest0-21swapper/709:34:597
407190999240,0cyclictest0-21swapper/710:55:137
4071905992422,1cyclictest23128-21apt11:20:006
4071900992422,1cyclictest20277-21perf11:15:015
4071900992422,1cyclictest20277-21perf11:15:015
407190099240,23cyclictest0-21swapper/512:30:145
4071895992422,1cyclictest0-21swapper/409:44:594
407189599240,23cyclictest0-21swapper/412:30:154
407189499240,0cyclictest0-21swapper/309:49:593
4071890992420,3cyclictest4159357-21idleruntime-cro09:39:592
407189099240,23cyclictest4185362-21cron10:25:002
407189099240,23cyclictest17400-21cron11:10:012
407189099240,23cyclictest17400-21cron11:10:002
407189099240,1cyclictest4113060-21cron08:20:012
4071888992423,1cyclictest0-21swapper/109:35:131
4071909992322,1cyclictest0-21swapper/710:15:137
4071909992321,1cyclictest1-21systemd09:04:597
407190999230,22cyclictest0-21swapper/711:05:167
407190999230,22cyclictest0-21swapper/711:05:167
407190599230,22cyclictest4127642-21perf08:44:596
407190599230,22cyclictest0-21swapper/610:25:166
4071900992321,1cyclictest26425-21apt-get11:25:135
407190099230,22cyclictest0-21swapper/511:15:145
407189599230,2cyclictest4089686-21munin-run07:40:004
407189599230,22cyclictest4148337-21apt-get09:20:144
4071894992321,2cyclictest0-21swapper/309:15:003
4071894992321,1cyclictest0-21swapper/309:05:013
4071894992319,3cyclictest43139-21apt-get11:55:013
407189499230,22cyclictest0-21swapper/312:00:143
407189499230,22cyclictest0-21swapper/308:55:143
4071890992322,1cyclictest0-21swapper/212:30:152
407189099230,22cyclictest0-21swapper/211:35:122
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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