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2026-09-03 - 20:00

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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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 Sep 03, 2026 00:45:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
34944332363315,17sleep150-21swapper/157
34944332363315,17sleep150-21swapper/157
34944052358314,16sleep90-21swapper/915
34944052358314,16sleep90-21swapper/915
34943012354312,32sleep120-21swapper/124
34943012354312,32sleep120-21swapper/124
34943792350311,14sleep10-21swapper/11
34943792350311,14sleep10-21swapper/11
34944002349326,15sleep40-21swapper/410
34944002349326,15sleep40-21swapper/410
34944672348305,17sleep110-21swapper/113
34944672348305,17sleep110-21swapper/113
34944872346319,17sleep140-21swapper/146
34944872346319,17sleep140-21swapper/146
34944032346326,12sleep70-21swapper/713
34944032346326,12sleep70-21swapper/713
34943352343317,17sleep100-21swapper/102
34943352343317,17sleep100-21swapper/102
34943092342316,17sleep20-21swapper/28
34943092342316,17sleep20-21swapper/28
34944692341315,17sleep130-21swapper/135
34944692341315,17sleep130-21swapper/135
34943502341315,17sleep80-21swapper/814
34943502341315,17sleep80-21swapper/814
34944402340315,16sleep50-21swapper/511
34944402340315,16sleep50-21swapper/511
34943842339313,17sleep60-21swapper/612
34943842339313,17sleep60-21swapper/612
34943992337311,17sleep30-21swapper/39
34943992337311,17sleep30-21swapper/39
34942502336310,17sleep00-21swapper/00
34942502336310,17sleep00-21swapper/00
39250692510,0sleep150-21swapper/157
35692402430,0sleep00-21swapper/00
349490299317,24cyclictest0-21swapper/135
349485999311,28cyclictest437120-21CPU8
349490299306,13cyclictest0-21swapper/135
349489199300,29cyclictest0-21swapper/102
349487699290,29cyclictest0-21swapper/612
349485599290,28cyclictest0-21swapper/11
3494910992828,0cyclictest0-21swapper/157
349491099280,27cyclictest0-21swapper/157
3494906992824,4cyclictest1612-21snmpd6
349490699280,27cyclictest0-21swapper/146
349490699280,27cyclictest0-21swapper/146
3494902992826,1cyclictest1612-21snmpd5
3494902992826,1cyclictest1612-21snmpd5
3494902992826,1cyclictest1612-21snmpd5
349490099280,27cyclictest0-21swapper/124
3494895992826,1cyclictest1612-21snmpd3
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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