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2023-02-06 - 13:48

x86 Intel Atom Z530 @1600 MHz, Linux 3.12.61-rt81 (Profile)

Latency plot of system in rack #1, slot #8
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 -Sp99 -i200 -h400 -q
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rack1slot8.osadl.org (updated Mon Feb 06, 2023 12:43:57)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
256752833813,13sleep10-21swapper/107:05:311
259322811788,16sleep00-21swapper/007:08:060
2616199466385,54cyclictest0-21swapper/007:10:040
2616199436356,51cyclictest0-21swapper/007:27:090
2616299409330,47cyclictest0-21swapper/107:10:041
2616299377298,49cyclictest0-21swapper/107:27:091
2119991120,34rtkit-daemon2118-21rtkit-daemon09:52:081
211999970,5rtkit-daemon2118-21rtkit-daemon07:44:070
211999960,12rtkit-daemon0-21swapper/011:48:310
211999900,7rtkit-daemon0-21swapper/009:00:530
211999850,3rtkit-daemon0-21swapper/009:42:130
211999830,3rtkit-daemon2118-21rtkit-daemon08:36:331
211999800,12rtkit-daemon2118-21rtkit-daemon08:21:170
211999790,4rtkit-daemon2118-21rtkit-daemon07:31:170
211999780,4rtkit-daemon2118-21rtkit-daemon12:32:170
211999780,4rtkit-daemon2118-21rtkit-daemon10:45:050
211999780,4rtkit-daemon2118-21rtkit-daemon08:56:420
211999780,4rtkit-daemon2118-21rtkit-daemon08:32:470
211999770,4rtkit-daemon2118-21rtkit-daemon10:22:030
211999770,4rtkit-daemon2118-21rtkit-daemon08:51:280
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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