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2022-10-03 - 04:22

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 Mon Oct 03, 2022 00:46:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1299911810,6ptp4l401ktimersoftd/319:05:053
103142835,19sleep20-21swapper/219:06:542
129991700,4ptp4l401ktimersoftd/319:10:003
10839997063,4cyclictest33-21ksoftirqd/221:35:152
103482705,54sleep10-21swapper/119:07:221
10839996743,14cyclictest33-21ksoftirqd/219:15:312
10839996659,4cyclictest33-21ksoftirqd/220:01:432
10839996457,4cyclictest33-21ksoftirqd/221:25:142
10839996457,4cyclictest33-21ksoftirqd/220:40:182
10839996457,4cyclictest33-21ksoftirqd/220:40:182
10839996444,8cyclictest33-21ksoftirqd/221:59:592
10839996357,4cyclictest33-21ksoftirqd/200:05:172
10839996356,4cyclictest33-21ksoftirqd/223:15:152
10839996356,4cyclictest33-21ksoftirqd/219:55:152
10839996356,4cyclictest33-21ksoftirqd/219:25:212
10839996255,5cyclictest33-21ksoftirqd/200:30:152
10839996255,4cyclictest33-21ksoftirqd/223:35:152
10839996255,4cyclictest33-21ksoftirqd/223:35:152
10839996255,4cyclictest33-21ksoftirqd/223:10:162
10839996154,4cyclictest33-21ksoftirqd/221:20:152
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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