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2023-05-28 - 02:25

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

Latency plot of system in rack #d, slot #4
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 rackdslot4.osadl.org (updated Sat May 27, 2023 12:46:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
105021730,8sleep383099cyclictest11:45:373
1574421720,8sleep182899cyclictest11:09:411
1299911540,12ptp4l209-21systemd-journal07:06:593
2515221170,8sleep182899cyclictest12:35:381
827997465,5cyclictest9-21ksoftirqd/009:50:220
258832720,8sleep383099cyclictest08:00:363
198692700,4sleep0101ktimersoftd/011:15:340
198692700,4sleep0101ktimersoftd/011:15:340
129991700,1ptp4l401ktimersoftd/308:40:573
827996960,5cyclictest9-21ksoftirqd/011:09:520
827996959,5cyclictest9-21ksoftirqd/012:15:220
830996859,4cyclictest41-21ksoftirqd/312:05:163
828996759,5cyclictest25-21ksoftirqd/111:45:261
4592675,48sleep20-21swapper/207:09:202
327302677,47sleep00-21swapper/007:06:580
32326548,7sleep10-21swapper/107:07:471
827996455,5cyclictest9-21ksoftirqd/010:00:180
827996455,5cyclictest9-21ksoftirqd/010:00:180
213412640,3sleep082799cyclictest09:00:330
827996334,10cyclictest9-21ksoftirqd/008:40:180
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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