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2022-10-04 - 02:45

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 Sun Oct 02, 2022 00:45:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
83989912292,18cyclictest14-21ksoftirqd/023:55:160
83989912190,21cyclictest14-21ksoftirqd/019:20:210
84039911886,20cyclictest26-21ksoftirqd/123:20:191
83989911891,18cyclictest14-21ksoftirqd/022:05:210
84039911786,19cyclictest26-21ksoftirqd/122:40:221
83989911688,19cyclictest14-21ksoftirqd/000:00:160
83989911685,21cyclictest14-21ksoftirqd/020:00:180
83989911610,64cyclictest0-21swapper/000:20:170
84039911175,23cyclictest26-21ksoftirqd/120:10:211
84039911175,23cyclictest26-21ksoftirqd/120:10:201
83989910776,22cyclictest14-21ksoftirqd/022:50:170
83989910776,22cyclictest14-21ksoftirqd/022:50:170
83989910776,19cyclictest14-21ksoftirqd/022:55:190
84039910667,29cyclictest26-21ksoftirqd/122:10:251
84039910664,34cyclictest26-21ksoftirqd/121:10:201
84039910660,35cyclictest26-21ksoftirqd/120:15:181
84039910659,33cyclictest26-21ksoftirqd/122:35:201
84039910652,43cyclictest26-21ksoftirqd/119:30:171
83989910612,81cyclictest0-21swapper/000:15:180
84039910558,34cyclictest26-21ksoftirqd/122:15:221
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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