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2026-08-20 - 19:28

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, slot #5

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 rack0slot5s.osadl.org (updated Thu Aug 20, 2026 00:45:24)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
41279662392369,15sleep120-21swapper/124
41280412378353,17sleep140-21swapper/146
41279072360316,16sleep70-21swapper/713
41279802359330,21sleep90-21swapper/915
41279542350306,16sleep00-21swapper/00
41279312347301,35sleep130-21swapper/135
41279962343296,17sleep80-21swapper/814
41278862341315,16sleep40-21swapper/410
41278292340314,17sleep30-21swapper/39
41278252340316,16sleep10-21swapper/11
41279102339313,17sleep100-21swapper/102
41280462338313,16sleep20-21swapper/28
41279242338312,17sleep60-21swapper/612
41280602337309,18sleep150-21swapper/157
41279652336311,16sleep110-21swapper/113
41278872334309,16sleep50-21swapper/511
412848999446,13cyclictest0-21swapper/135
412848999437,11cyclictest0-21swapper/135
412848999426,11cyclictest0-21swapper/135
3253192350,1sleep1321rcuc/11
412848999349,14cyclictest0-21swapper/135
412848999349,14cyclictest0-21swapper/135
412848999327,14cyclictest0-21swapper/135
412848999316,25cyclictest0-21swapper/135
412845699310,30cyclictest0-21swapper/410
4128451993026,3cyclictest1612-21snmpd9
4128489992925,4cyclictest1612-21snmpd5
4128475992927,1cyclictest1612-21snmpd15
4128463992927,1cyclictest1612-21snmpd12
412844899290,28cyclictest0-21swapper/28
412849899280,27cyclictest0-21swapper/157
412849899280,27cyclictest0-21swapper/157
412849899280,27cyclictest0-21swapper/157
4128483992821,6cyclictest1612-21snmpd3
412847599280,27cyclictest0-21swapper/915
412847599280,27cyclictest0-21swapper/915
4128467992827,1cyclictest1612-21snmpd13
412846399280,27cyclictest0-21swapper/612
412846399280,27cyclictest0-21swapper/612
4128456992827,1cyclictest1612-21snmpd10
4128456992827,1cyclictest0-21swapper/410
4128456992824,4cyclictest1612-21snmpd10
4128456992824,4cyclictest1612-21snmpd10
412845699280,27cyclictest0-21swapper/410
412845699280,27cyclictest0-21swapper/410
412845699280,27cyclictest0-21swapper/410
4128451992827,1cyclictest0-21swapper/39
4128451992825,3cyclictest1612-21snmpd9
412845199280,27cyclictest0-21swapper/39
412845199280,27cyclictest0-21swapper/39
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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