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2026-04-18 - 15:56

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 20 highest latencies:
System rack0slot5s.osadl.org (updated Sat Apr 18, 2026 00:45:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
24646822361314,17sleep30-21swapper/39
24656382358326,25sleep60-21swapper/612
24656622354335,12sleep130-21swapper/135
24655242348322,17sleep10-21swapper/11
24657082346320,17sleep20-21swapper/28
24656702345320,16sleep40-21swapper/410
24655522345321,16sleep120-21swapper/124
24656232344319,17sleep100-21swapper/102
24656822342316,17sleep150-21swapper/157
24657292341314,18sleep50-21swapper/511
24656032339313,17sleep70-21swapper/713
24655492339314,16sleep90-21swapper/915
24655142338313,16sleep80-21swapper/814
24657352337315,14sleep110-21swapper/113
24655202335309,17sleep140-21swapper/146
24657952334309,16sleep00-21swapper/00
270175221120,0sleep132701748-21/usr/share/muni5
246618999467,14cyclictest0-21swapper/157
246618999447,12cyclictest2729182-21if_err_enp3s07
2466142994039,1cyclictest1608-21snmpd9
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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