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2023-02-06 - 14:19

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 20 highest latencies:
System rackdslot3.osadl.org (updated Mon Feb 06, 2023 00:46:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2832621760,7sleep0540399cyclictest23:25:000
8255911600,6ptp4l391rcuc/319:07:163
496428715,59sleep20-21swapper/219:08:022
45142820,2sleep30-21swapper/321:25:163
498228011,57sleep00-21swapper/019:08:160
234882760,9sleep3540699cyclictest20:55:263
825591660,1ptp4l401ktimersoftd/323:45:453
825591590,1ptp4l401ktimersoftd/319:45:083
825591570,1ptp4l401ktimersoftd/321:45:273
825591560,1ptp4l391rcuc/321:08:293
5406995442,9cyclictest41-21ksoftirqd/323:35:133
5406995442,9cyclictest41-21ksoftirqd/323:35:133
825591530,1ptp4l401ktimersoftd/323:55:013
57698520,15rtkit-daemon0-21swapper/220:13:362
5406995241,6cyclictest41-21ksoftirqd/322:45:133
5405995129,19cyclictest33-21ksoftirqd/222:01:522
5405995129,19cyclictest33-21ksoftirqd/222:01:522
5405995126,4cyclictest33-21ksoftirqd/220:42:002
825591500,1ptp4l401ktimersoftd/300:20:223
825591500,1ptp4l401ktimersoftd/300:17:173
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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