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2023-06-07 - 12:14

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, slot #3

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 
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x86 AMD Ryzen XXXX @3300 MHz, Linux 4.18.7-rt5 (Profile)

Latency plot of shadow in rack #c, slot #3
Data to construct the above plot have been generated using the RT test utility cyclictest.
Unexpectedly long latencies may be caused by SMIs
Command line: cyclictest -l100000000 -m -Sp99 -i200 -h400 -q
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 rackcslot3s (updated Wed Jun 07, 2023 00:50:28)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
268402619607,6sleep30-21swapper/319:05:213
281512510488,15sleep20-21swapper/219:06:482
282222509487,15sleep60-21swapper/619:07:486
283092507488,14sleep10-21swapper/119:09:031
283122496475,15sleep40-21swapper/419:09:074
282862484464,14sleep70-21swapper/719:08:467
281432461436,19sleep50-21swapper/519:06:425
281022450434,11sleep00-21swapper/019:06:060
702521380,0sleep30-21swapper/322:55:013
28817991000,1cyclictest282-21systemd-journal23:05:006
2881199950,0cyclictest282-21systemd-journal21:34:590
28814999392,0cyclictest21542-21cron21:09:593
28812998281,0cyclictest28728-21sh21:25:001
28815997978,0cyclictest20138-21sh22:15:004
2881799750,50cyclictest0-21swapper/622:15:006
2881399720,1cyclictest282-21systemd-journal22:04:592
28812997271,0cyclictest7745-21sh00:05:011
2881199700,0cyclictest282-21systemd-journal23:55:010
28813996967,1cyclictest21540-21sh21:10:002
28812996968,0cyclictest30638-21sh23:45:011
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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