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2023-02-07 - 18:59

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

Latency plot of system in rack #d, slot #1
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 rackdslot1.osadl.org (updated Tue Feb 07, 2023 12:46:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1176911720,65ptp4l0-21swapper/007:08:050
1176911650,13ptp4l0-21swapper/207:06:052
1176911640,46ptp4l0-21swapper/107:05:281
1176911460,7ptp4l0-21swapper/307:06:163
117691700,2ptp4l0-21swapper/207:50:292
117691650,4ptp4l17330-21taskset09:30:401
284992620,3sleep10-21swapper/108:45:401
14685996216,14cyclictest25806-21unixbench_multi07:30:350
117691610,4ptp4l20031-21apt-get08:30:201
117691610,2ptp4l0-21swapper/211:16:322
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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