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2023-06-07 - 10:13

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 Wed Jun 07, 2023 00:43:25)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
252542314238,55sleep00-21swapper/00
261112288250,25sleep10-21swapper/11
259082282244,25sleep20-21swapper/22
259922227192,22sleep30-21swapper/33
756821270,4sleep12640399cyclictest1
221021240,4sleep02639899cyclictest0
213162450,2sleep20-21swapper/22
213162450,2sleep20-21swapper/22
2641499441,21cyclictest0-21swapper/33
2641499438,16cyclictest30851-21latency_hist3
2641499420,21cyclictest5816-21date3
2641499411,23cyclictest1526-21ntp_states3
2641499411,19cyclictest27968-21date3
2641499410,21cyclictest29441-21cat3
2641499410,19cyclictest6840-21latency_hist3
246092410,3sleep20-21swapper/22
2641499401,23cyclictest12022-40install3
2641499401,20cyclictest14704-21df_inode3
2641499400,24cyclictest14277-21cron3
2641499400,23cyclictest29674-21wget3
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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