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2023-02-06 - 14:15

x86 Intel Atom E3845 @1910 MHz, Linux 4.19.37-rt19 (Profile)

Latency plot of system in rack #d, 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 -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 rackdslot2.osadl.org (updated Mon Feb 06, 2023 00:46:20)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1088321830,9sleep0429599cyclictest20:30:360
1339911200,4ptp4l401ktimersoftd/319:08:293
429799800,33cyclictest28862-21/usr/sbin/munin20:00:312
29982804,17sleep20-21swapper/219:05:252
55498790,12rtkit-daemon0-21swapper/019:07:360
429799779,25cyclictest14934-21irqrtprio00:05:212
429799779,25cyclictest14934-21irqrtprio00:05:212
4297997714,30cyclictest12807-21gzip20:35:322
429799771,29cyclictest26525-21find19:55:272
4297997710,25cyclictest10226-21sh21:40:182
429799760,28cyclictest10502-21grep20:30:332
429799750,25cyclictest446-21grep21:20:152
429799740,29cyclictest5952-21chrt23:45:272
429799740,28cyclictest19823-21date23:10:002
429799740,27cyclictest4309-21latency_hist23:45:002
388427455,9sleep10-21swapper/119:08:241
429799731,28cyclictest19630-21tune2fs22:00:172
429799730,29cyclictest8737-21switchtime21:35:362
429799730,27cyclictest30702-21irqrtprio20:05:222
429799730,27cyclictest28078-21wc00:35:012
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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