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2023-02-06 - 14:07

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 Mon Feb 06, 2023 12:45:13)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
8586991138,82cyclictest0-21swapper/010:40:200
8586991065,84cyclictest14-21ksoftirqd/007:15:190
8586991058,76cyclictest0-21swapper/011:35:160
8018210325,65sleep00-21swapper/007:06:470
2333621030,7chrt23339-21needreboot11:15:311
858699998,72cyclictest0-21swapper/008:40:170
176572990,5sleep13655-21kworker/1:009:10:121
176572990,5sleep13655-21kworker/1:009:10:121
858699986,73cyclictest0-21swapper/012:30:220
8587999466,13cyclictest26-21ksoftirqd/111:55:181
8587999167,12cyclictest26-21ksoftirqd/110:20:211
8587999164,15cyclictest26-21ksoftirqd/111:00:201
8586999115,59cyclictest0-21swapper/007:40:170
8587999062,16cyclictest26-21ksoftirqd/108:50:201
8587998962,13cyclictest26-21ksoftirqd/108:55:191
8587998958,21cyclictest26-21ksoftirqd/107:25:191
8587998958,21cyclictest26-21ksoftirqd/107:25:181
8587998957,21cyclictest26-21ksoftirqd/108:35:171
858699897,67cyclictest0-21swapper/012:00:220
8587998860,15cyclictest26-21ksoftirqd/110:10:181
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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