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2023-02-07 - 19:04

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 10 highest latencies:
System rackdslot2.osadl.org (updated Tue Feb 07, 2023 12:46:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1339911660,6ptp4l401ktimersoftd/307:05:453
540521580,8sleep22821899cyclictest12:05:192
276882121100,10sleep10-21swapper/107:06:551
276672774,17sleep00-21swapper/007:06:380
236242730,3sleep00-21swapper/011:35:210
133991730,2ptp4l391rcuc/308:00:543
133991720,5ptp4l401ktimersoftd/307:10:003
28218996929,9cyclictest33-21ksoftirqd/210:20:202
28218996630,7cyclictest33-21ksoftirqd/212:00:012
28218996530,5cyclictest33-21ksoftirqd/211:05:312
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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