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2022-05-21 - 11:14

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

Latency plot of system in rack #d, slot #3
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 rackdslot3.osadl.org (updated Mon Mar 07, 2022 12:46:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
151521810,8sleep33230499cyclictest11:10:153
1875421590,8sleep03230199cyclictest08:50:190
12829110180,9phc2sys0-21swapper/307:08:493
12829110180,9phc2sys0-21swapper/307:08:493
170812770,7sleep13230299cyclictest10:10:111
3094426944,10sleep20-21swapper/207:05:292
3094426944,10sleep20-21swapper/207:05:292
306512680,3sleep10-21swapper/109:05:191
3230199570,3cyclictest0-21swapper/010:35:190
3230199561,3cyclictest0-21swapper/007:15:170
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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