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2022-05-25 - 21:22

x86 Intel N455 @1660 MHz, Linux 5.4.34-rt21 (Profile)

Latency plot of system in rack #3, slot #6
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 10 highest latencies:
System rack3slot6 (updated Wed May 25, 2022 12:45:21)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
14588991169,93cyclictest7947-21apt-get08:25:150
14588991169,42cyclictest12183-21snmpd11:10:150
14588991119,40cyclictest12183-21snmpd11:25:200
14596999214,64cyclictest0-21swapper/111:15:331
14596998916,31cyclictest30342-21seq09:30:151
14596998715,56cyclictest0-21swapper/111:00:131
14596998712,60cyclictest0-21swapper/109:55:141
14596998614,58cyclictest0-21swapper/112:20:131
14588998635,32cyclictest9-21ksoftirqd/010:50:140
14596998541,29cyclictest21-21ksoftirqd/110:05:141
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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