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2023-06-06 - 12:24

x86 Intel Atom E3950 @1600 MHz, Linux 5.6.19-rt12 (Profile)

Latency plot of system in rack #9, slot #2
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 10 highest latencies:
System rack9slot2 (updated Tue Jun 06, 2023 00:43:25)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
90522283248,22sleep20-21swapper/22
93102256190,24sleep10-21swapper/11
91632256218,25sleep00-21swapper/00
92062241171,25sleep30-21swapper/33
2213821490,1sleep30-21swapper/33
2705621150,1sleep00-21swapper/00
7972540,1sleep10-21swapper/11
13982520,5sleep2949799cyclictest2
149512480,1sleep00-21swapper/00
149512480,1sleep00-21swapper/00
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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