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2023-01-29 - 06:14

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 20 highest latencies:
System rack9slot2 (updated Sun Jan 29, 2023 00:43:25)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
931199270263,4cyclictest13810-21perf3
88662256193,50sleep10-21swapper/11
90022252186,51sleep00-21swapper/00
89902240175,50sleep30-21swapper/33
91402238180,45sleep20-21swapper/22
929799220215,3cyclictest13828-21idleruntime-cro0
930399159154,3cyclictest13787-21munin-run2
93009910699,4cyclictest13829-21basename1
267672540,1sleep30-21swapper/33
56012470,2sleep30-21swapper/33
158642470,2sleep00-21swapper/00
34822440,1sleep30-21swapper/33
193092440,1sleep319312-21awk3
9311993615,19cyclictest21039-21cat3
9311993514,19cyclictest20211-21cat3
9311993314,17cyclictest8519-21date3
9311993215,14cyclictest32295-21gltestperf3
9311993214,15cyclictest4745-21ntpq3
9297993220,3cyclictest9-21ksoftirqd/00
9311993115,14cyclictest29034-21irqstats3
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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