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2023-02-07 - 20:00

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 Feb 07, 2023 12:43:25)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
29212287209,36sleep10-21swapper/11
31342276210,35sleep00-21swapper/00
33792253191,49sleep30-21swapper/33
32172244171,24sleep20-21swapper/22
361299228215,11cyclictest8086-21munin-run0
361799198190,5cyclictest8078-21sendmail1
362199194188,4cyclictest8092-21awk2
474921510,2sleep228-21ksoftirqd/22
3103421510,4sleep3362599cyclictest3
3103421510,4sleep3362599cyclictest3
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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