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2022-12-08 - 21:23

x86 Intel N455 @1660 MHz, Linux 5.15.49-rt47 (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 20 highest latencies:
System rack3slot6 (updated Thu Dec 08, 2022 12:45:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
14068991156,95cyclictest30912-21apt-get11:15:170
140689910336,22cyclictest14-21ksoftirqd/009:10:170
874021020,7chrt8743-21cut11:45:290
140689910014,18cyclictest0-21swapper/008:35:160
14068999916,19cyclictest0-21swapper/007:45:180
14068999715,18cyclictest0-21swapper/008:10:200
47782960,6chrt4777-21sshd11:34:181
14072999557,22cyclictest26-21ksoftirqd/108:50:201
1406899957,24cyclictest2731-21apt-get09:50:200
14068999416,18cyclictest0-21swapper/012:25:190
14072999313,14cyclictest0-21swapper/110:40:211
14068999318,19cyclictest0-21swapper/010:35:200
14068999318,19cyclictest0-21swapper/010:35:190
14068999318,17cyclictest0-21swapper/008:40:220
14068999316,19cyclictest0-21swapper/010:45:160
14072999210,12cyclictest0-21swapper/112:35:181
14072999210,12cyclictest0-21swapper/110:25:171
14068999217,17cyclictest0-21swapper/009:05:170
14068999214,21cyclictest260-21systemd-journal10:28:340
14072999157,23cyclictest26-21ksoftirqd/109:25:151
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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