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2025-12-02 - 14:59

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 Tue Dec 02, 2025 12:44:44)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
29430602225167,20sleep50-21swapper/507:07:485
29430442219162,19sleep70-21swapper/707:07:337
29429462217184,21sleep30-21swapper/307:06:093
29429832213174,26sleep20-21swapper/207:06:392
29429942210178,21sleep40-21swapper/407:06:504
29429132206174,21sleep60-21swapper/607:05:396
29430742202172,19sleep10-21swapper/107:07:591
29431302201174,17sleep00-21swapper/007:08:460
294363499264,4cyclictest0-21swapper/712:35:587
294363499264,4cyclictest0-21swapper/708:23:217
294361099260,22cyclictest0-21swapper/112:20:131
294362299250,1cyclictest0-21swapper/408:40:014
2943610992520,4cyclictest2981499-21munin-run08:15:011
294361099250,24cyclictest0-21swapper/108:45:141
2943606992524,1cyclictest0-21swapper/008:30:000
294362999240,22cyclictest0-21swapper/609:20:006
294362599240,23cyclictest3024663-21idleruntime-cro09:30:015
294362599240,23cyclictest0-21swapper/511:35:135
294362599240,1cyclictest0-21swapper/508:55:145
294362599240,1cyclictest0-21swapper/508:55:145
294362299240,23cyclictest3076871-21grep11:00:004
294362299240,23cyclictest0-21swapper/409:35:144
294362299240,22cyclictest3031059-21apt-get09:40:124
2943619992422,1cyclictest3097569-21apt-get11:35:123
2943610992423,1cyclictest2964775-21apt-get07:45:131
2943610992421,3cyclictest0-21swapper/109:50:121
2943610992417,6cyclictest2950043-21idleruntime-cro07:20:011
294361099240,21cyclictest3091444-21perf11:24:591
294361099240,21cyclictest0-21swapper/109:20:121
2943606992420,3cyclictest2946463-21awk07:15:000
2943629992323,0cyclictest0-21swapper/611:00:136
294362999230,22cyclictest3120027-21awk12:14:596
294362599230,22cyclictest2987650-21apt-get08:25:115
294362599230,22cyclictest2970800-21systemd-journal12:09:595
2943622992323,0cyclictest0-21swapper/410:35:134
2943622992321,1cyclictest3025067-21apt-get09:30:134
294362299230,23cyclictest2950032-21munin-run07:20:004
294362299230,22cyclictest2961496-21systemctl07:40:014
294362299230,1cyclictest0-21swapper/412:05:004
294361999230,22cyclictest2946460-21sleep07:15:013
294361999230,22cyclictest0-21swapper/310:54:593
2943617992321,1cyclictest3122873-21grep12:19:592
2943617992321,1cyclictest3042486-21apt-get10:00:122
2943617992320,2cyclictest0-21swapper/210:20:122
2943617992318,4cyclictest2999350-21apt-get08:45:142
294361799230,23cyclictest2972943-21sendmail08:00:002
2943610992321,1cyclictest3103294-21apt-get11:45:121
294361099230,1cyclictest0-21swapper/110:50:001
294360699230,23cyclictest0-21swapper/011:15:000
294360699230,1cyclictest0-21swapper/011:45:120
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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