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2023-02-07 - 19:12

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 10 highest latencies:
System rackdslot4.osadl.org (updated Tue Feb 07, 2023 12:46:24)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
194421580,8sleep02762699cyclictest09:40:200
1299911120,4ptp4l401ktimersoftd/307:09:123
27629996833,10cyclictest41-21ksoftirqd/310:35:263
271822684,51sleep10-21swapper/107:09:401
2762999657,9cyclictest41-21ksoftirqd/307:35:003
2762999656,9cyclictest41-21ksoftirqd/309:55:143
2762999647,9cyclictest41-21ksoftirqd/307:40:183
2762999646,10cyclictest41-21ksoftirqd/311:05:323
2762999646,10cyclictest41-21ksoftirqd/310:25:193
2762999646,10cyclictest41-21ksoftirqd/310:25:193
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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