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2022-05-26 - 19:53

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 20 highest latencies:
System rack3slot6 (updated Thu May 26, 2022 12:45:17)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2984428832,43sleep10-21swapper/107:05:151
35682760,6sleep00-21swapper/012:05:020
31363997342,18cyclictest0-21swapper/111:40:101
31363997341,21cyclictest21-21ksoftirqd/107:15:151
31363997242,18cyclictest0-21swapper/110:45:141
31363997242,17cyclictest0-21swapper/112:35:141
260412720,14sleep03136199cyclictest08:25:310
31363997144,15cyclictest0-21swapper/109:00:151
31363997140,19cyclictest12183-21snmpd12:15:161
31363997043,15cyclictest0-21swapper/108:40:141
31363997040,16cyclictest12183-21snmpd07:30:121
236482700,3sleep00-21swapper/011:30:220
124232700,13sleep03136199cyclictest07:45:390
31363996942,14cyclictest0-21swapper/109:15:131
31363996940,15cyclictest0-21swapper/107:20:121
31363996938,18cyclictest0-21swapper/109:05:151
31363996938,17cyclictest0-21swapper/110:05:121
31363996937,17cyclictest0-21swapper/107:10:151
31363996843,14cyclictest0-21swapper/110:20:151
31363996841,15cyclictest0-21swapper/109:10:131
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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