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2021-07-26 - 19:12

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

Latency plot of system in rack #d, slot #3
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 rackdslot3.osadl.org (updated Mon Jul 26, 2021 12:46:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
560522490,7sleep00-21swapper/007:05:340
1283911890,6ptp4l401ktimersoftd/307:06:573
846621710,9sleep1641699cyclictest10:30:221
1429721640,8sleep0641599cyclictest08:40:000
5709210282,9sleep10-21swapper/107:05:531
58202754,58sleep20-21swapper/207:07:182
128391700,1ptp4l401ktimersoftd/309:53:593
26172660,2sleep00-21swapper/011:45:060
6416996255,4cyclictest25-21ksoftirqd/109:15:161
6416995952,4cyclictest25-21ksoftirqd/108:45:141
6417995848,6cyclictest33-21ksoftirqd/211:25:122
128391580,17ptp4l14284-21taskset07:59:003
88152570,6sleep08818-21irqrtprio08:30:370
6416995345,5cyclictest25-21ksoftirqd/108:00:131
6417995143,4cyclictest33-21ksoftirqd/211:50:142
6417994740,4cyclictest2780-21processes09:45:052
128391460,1ptp4l401ktimersoftd/309:23:473
6416994436,5cyclictest25-21ksoftirqd/109:05:131
6416994436,5cyclictest25-21ksoftirqd/107:50:161
128391440,1ptp4l401ktimersoftd/311:26:143
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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