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2026-09-24 - 21:33

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 Sep 24, 2026 00:45:28)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
6676842388363,17sleep80-21swapper/814
6677192373365,5sleep50-21swapper/511
6677312348306,33sleep00-21swapper/00
6678312347322,16sleep90-21swapper/915
6678262346320,17sleep40-21swapper/410
6677782344319,16sleep100-21swapper/102
6675592344317,17sleep70-21swapper/713
6677432342317,16sleep120-21swapper/124
6677162342316,17sleep20-21swapper/28
6678432341315,17sleep10-21swapper/11
6677342341316,16sleep30-21swapper/39
6678392340314,17sleep150-21swapper/157
6677252334308,17sleep110-21swapper/113
6676542334309,16sleep130-21swapper/135
6675392334308,17sleep140-21swapper/146
6675312334309,16sleep60-21swapper/612
668176993721,16cyclictest0-21swapper/11
66822399350,9cyclictest0-21swapper/135
66822399350,9cyclictest0-21swapper/135
668227993433,1cyclictest0-21swapper/146
66822399340,9cyclictest0-21swapper/135
66822399340,8cyclictest0-21swapper/135
668215993434,0cyclictest0-21swapper/113
668227993232,0cyclictest0-21swapper/146
668223993232,0cyclictest0-21swapper/135
668194993232,0cyclictest0-21swapper/511
668229993131,0cyclictest0-21swapper/157
668229993131,0cyclictest0-21swapper/157
668218993131,0cyclictest0-21swapper/124
668185993115,16cyclictest0-21swapper/39
668227993030,0cyclictest0-21swapper/146
66818199300,29cyclictest344344-21kworker/2:1+mm_percpu_wq8
668176993029,1cyclictest0-21swapper/11
668229992929,0cyclictest0-21swapper/157
668229992929,0cyclictest0-21swapper/157
668223992928,1cyclictest0-21swapper/135
66822399290,0cyclictest0-21swapper/135
668215992928,1cyclictest0-21swapper/113
66821199290,0cyclictest0-21swapper/102
668208992929,0cyclictest0-21swapper/915
668204992926,3cyclictest1612-21snmpd14
668204992926,2cyclictest437118-21CPU14
66818999291,28cyclictest0-21swapper/410
668185992929,0cyclictest0-21swapper/39
668185992928,1cyclictest0-21swapper/39
668181992929,0cyclictest0-21swapper/28
668223992825,2cyclictest1612-21snmpd5
66822399280,27cyclictest0-21swapper/135
66822399280,27cyclictest0-21swapper/135
668218992824,3cyclictest1612-21snmpd4
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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