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2021-09-28 - 09:49

Intel(R) Atom(TM) CPU N455 @ 1.66GHz, 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 Tue Sep 28, 2021 00:45:28)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1290521400,18sleep02113699cyclictest21:55:320
19723210639,47sleep10-21swapper/119:05:191
21145991050,10cyclictest0-21swapper/119:10:391
21145991030,10cyclictest0-21swapper/123:40:401
21145991020,9cyclictest0-21swapper/120:45:121
21145991020,10cyclictest0-21swapper/121:50:281
211369910221,63cyclictest0-21swapper/020:10:190
21145991010,11cyclictest0-21swapper/119:35:241
21145991010,10cyclictest0-21swapper/123:45:441
21145991010,10cyclictest0-21swapper/123:05:311
21145991010,10cyclictest0-21swapper/122:30:521
21145991010,10cyclictest0-21swapper/121:30:191
21145991010,10cyclictest0-21swapper/121:25:201
21145991000,11cyclictest0-21swapper/119:20:391
2114599990,11cyclictest0-21swapper/122:14:111
2114599990,10cyclictest0-21swapper/123:10:241
21136999920,65cyclictest0-21swapper/019:40:160
21136999920,65cyclictest0-21swapper/019:40:150
21136999918,67cyclictest0-21swapper/023:10:210
21136999917,68cyclictest0-21swapper/020:50:140
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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