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2023-05-31 - 11:59

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 Wed May 31, 2023 00:46:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2819821680,8sleep3933199cyclictest00:25:413
9331999684,8cyclictest41-21ksoftirqd/321:55:363
9331998675,6cyclictest41-21ksoftirqd/300:05:193
133991830,4ptp4l401ktimersoftd/319:09:413
133991810,19ptp4l204-21systemd-journal19:10:013
9331998064,11cyclictest41-21ksoftirqd/321:15:203
9331997862,9cyclictest41-21ksoftirqd/322:30:253
9331997769,5cyclictest41-21ksoftirqd/322:50:203
9329997768,5cyclictest25-21ksoftirqd/123:55:271
89982755,12sleep20-21swapper/219:09:272
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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