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2025-11-26 - 21:55

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 26, 2025 12:44:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
18715232239175,22sleep10-21swapper/107:05:461
18718082228167,48sleep20-21swapper/207:09:482
18715222221164,18sleep00-21swapper/007:05:450
18717312216159,44sleep40-21swapper/407:08:464
18718142215181,21sleep60-21swapper/607:09:536
18715202214174,26sleep70-21swapper/707:05:447
18716552213174,24sleep30-21swapper/307:07:403
18717752208174,22sleep50-21swapper/507:09:195
187206599270,22cyclictest1924655-21perf08:39:597
187206599270,1cyclictest0-21swapper/709:39:477
1872041992623,2cyclictest1970638-21sh10:00:000
1872065992519,5cyclictest0-21swapper/712:05:007
1872056992523,1cyclictest0-21swapper/409:40:004
187206599247,4cyclictest0-21swapper/707:57:287
1872065992423,1cyclictest0-21swapper/707:10:187
1872065992421,3cyclictest0-21swapper/708:55:127
187206599240,23cyclictest2031188-21cat11:45:017
187205299240,24cyclictest1959239-21idleruntime-cro09:40:003
187205099240,1cyclictest2030979-21apt-get11:45:012
1872046992419,5cyclictest2045548-21awk12:10:011
187204699240,24cyclictest1874806-21awk07:15:001
1872065992320,3cyclictest0-21swapper/709:15:137
187206599231,21cyclictest0-21swapper/708:25:217
187206599230,6cyclictest2970800-21systemd-journal07:25:007
187206599230,22cyclictest2036964-21perf11:55:007
187206199231,21cyclictest2030979-21apt-get11:45:026
1872059992323,0cyclictest0-21swapper/511:15:115
1872059992322,1cyclictest1890267-21apt-get07:40:135
187205999230,22cyclictest1984994-21munin-run10:25:015
187205999230,22cyclictest1881661-21apt-get07:25:105
187205699230,2cyclictest1953516-21sleep09:30:014
1872052992322,1cyclictest2031005-21idleruntime-cro11:45:003
187205299230,23cyclictest0-21swapper/307:15:153
187205299230,22cyclictest1971084-21apt-get10:00:123
187205299230,22cyclictest0-21swapper/308:50:113
187205299230,21cyclictest0-21swapper/311:10:123
187205099230,1cyclictest0-21swapper/207:35:002
1872046992321,1cyclictest0-21swapper/110:55:011
1872046992321,1cyclictest0-21swapper/107:35:121
187204699230,23cyclictest1922211-21apt-get08:35:111
187204699230,22cyclictest1936515-21apt-get09:00:101
1872041992321,1cyclictest2043103-21apt-get12:05:130
1872041992320,2cyclictest1987843-21turbostat10:30:000
187204199230,22cyclictest1930790-21apt-get08:50:120
187204199230,22cyclictest1919360-21apt-get08:30:120
187204199230,22cyclictest0-21swapper/011:20:120
187204199230,22cyclictest0-21swapper/007:50:000
1872065992220,1cyclictest0-21swapper/712:15:017
1872065992220,1cyclictest0-21swapper/711:10:007
1872065992219,3cyclictest0-21swapper/711:30:027
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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