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2021-06-20 - 03:15

Intel(R) Atom(TM) CPU N455 @ 1.66GHz, Linux 5.4.34-rt21 (Profile)

Latency plot of system in rack #3, slot #6
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 rack3slot6 (updated Sun Jun 20, 2021 00:45:21)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2777429924,21sleep10-21swapper/119:07:091
2777429924,21sleep10-21swapper/119:07:081
2655529133,45sleep00-21swapper/019:05:130
2655529133,45sleep00-21swapper/019:05:130
28171998610,55cyclictest0-21swapper/120:29:111
28164998339,17cyclictest32125-21ntp_states22:30:290
28164998215,29cyclictest0-21swapper/022:15:170
28164998152,18cyclictest39450irq/29-enp3s000:35:150
28164998152,16cyclictest0-21swapper/019:35:260
2816499806,63cyclictest9-21ksoftirqd/023:10:140
28164998052,16cyclictest0-21swapper/022:25:150
28164997937,34cyclictest19543-21kworker/0:020:25:150
28164997916,47cyclictest0-21swapper/023:35:130
28164997912,56cyclictest9-21ksoftirqd/021:20:110
28164997833,35cyclictest0-21swapper/022:55:140
2817199778,46cyclictest0-21swapper/123:40:131
28164997744,17cyclictest0-21swapper/020:05:140
28164997714,49cyclictest0-21swapper/000:30:130
28164997647,20cyclictest0-21swapper/021:10:140
28164997645,17cyclictest0-21swapper/020:00:150
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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