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2021-06-20 - 03:17

Intel(R) Atom(TM) CPU E3845 @ 1.91GHz, Linux 4.19.37-rt19 (Profile)

Latency plot of system in rack #d, slot #1
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 -Up99 -i200 -h400 --smi -q
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Characteristics of the 20 highest latencies:
System rackdslot1.osadl.org (updated Sun Jun 20, 2021 00:46:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
344822170,2sleep20-21swapper/219:05:282
1152221770,7sleep2458099cyclictest19:55:252
1152221770,7sleep2458099cyclictest19:55:252
2108021720,3sleep1457999cyclictest20:50:051
1146911680,46ptp4l0-21swapper/119:06:151
1146911650,15ptp4l0-21swapper/019:07:060
1146911520,69ptp4l0-21swapper/319:08:023
4580998678,5cyclictest33-21ksoftirqd/220:00:142
4580998476,5cyclictest33-21ksoftirqd/221:30:162
296462800,3sleep029650-21cpuspeed_turbos20:20:090
114691800,28ptp4l482-21turbostat.cron00:29:550
50972730,4sleep15095-21cat00:30:031
4580997360,9cyclictest33-21ksoftirqd/220:20:132
4580997259,7cyclictest33-21ksoftirqd/200:25:152
114691720,2ptp4l0-21swapper/020:10:010
114691700,2ptp4l0-21swapper/222:04:442
458199695,5cyclictest114691ptp4l19:55:313
458199695,5cyclictest114691ptp4l19:55:303
4581996955,8cyclictest41-21ksoftirqd/321:30:133
114691690,2ptp4l0-21swapper/123:40:131
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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