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2023-06-02 - 20:19

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 10 highest latencies:
System rack3slot6 (updated Fri Jun 02, 2023 12:45:04)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
104889912512,24cyclictest0-21swapper/009:45:140
104889912012,93cyclictest0-21swapper/008:50:210
104939911958,54cyclictest21180-31find07:40:341
104889911873,32cyclictest14-21ksoftirqd/011:05:200
10488991156,59cyclictest605-21runrttasks07:45:200
104889911212,24cyclictest0-21swapper/010:15:170
104889911063,33cyclictest14-21ksoftirqd/009:40:180
104889910854,33cyclictest14-21ksoftirqd/010:00:200
104889910656,34cyclictest14-21ksoftirqd/008:45:160
104889910650,32cyclictest14-21ksoftirqd/011:30:190
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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