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2022-12-07 - 02:04

x86 Intel Atom x6425RE @1900 MHz, Linux 6.0.0-rt11 (Profile)

Latency plot of system in rack #e, slot #7
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 -h800 -q
Total number of samples: 100 million
Resolution of latency scale: reduced 
Duration: 5 hours, 33 minutes, lowest P state: performance
Characteristics of the 20 highest latencies:
System rackeslot7.osadl.org (updated Mon Jun 06, 2022 00:44:13)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1917936997062,3cyclictest2004443-21latency_hist20:30:020
1917927996759,4cyclictest2070154-21apt-get21:25:120
1917927996659,3cyclictest1923310-21latency_hist19:15:020
1917936996560,2cyclictest2288164-21kworker/u8:0+flush-8:000:10:320
1917936996558,3cyclictest267-21systemd-journal23:25:010
1917927996558,3cyclictest2299193-21apt-get23:55:110
1917927996454,6cyclictest267-21systemd-journal19:45:020
1917927996357,2cyclictest2283053-21latency_hist23:45:020
1917936996254,6cyclictest267-21systemd-journal19:35:010
1917936996251,9cyclictest267-21systemd-journal23:50:270
1917927996255,3cyclictest267-21systemd-journal22:30:010
1917936996152,7cyclictest267-21systemd-journal21:00:020
1917936996055,3cyclictest1185-21rs:main0
1917936995952,5cyclictest2283804-21apt-get23:45:120
1917927995848,8cyclictest2085403-21apt-get21:35:120
1917936995750,4cyclictest2169010-21apt-get22:30:120
1917927995651,3cyclictest2176578-21apt-get22:35:110
750589550,0phc2sys0-21swapper/121:41:171
1917936995549,4cyclictest1185-21rs:main0
1917936995249,2cyclictest2077413-21kworker/u8:2+events_unbound22:05:180
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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