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2023-05-28 - 18:34

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 May 28, 2023 12:45:03)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2816921306,108sleep0528-21snmpd07:05:380
287709910158,36cyclictest528-21snmpd08:50:210
28770998656,17cyclictest14-21ksoftirqd/008:25:170
2834928626,49sleep10-21swapper/107:07:351
28770998467,10cyclictest14-21ksoftirqd/010:05:220
28770998360,11cyclictest14-21ksoftirqd/011:37:070
28770998356,15cyclictest14-21ksoftirqd/007:55:150
28770998158,14cyclictest14-21ksoftirqd/007:30:200
28770998149,19cyclictest14-21ksoftirqd/012:10:210
28770998022,53cyclictest0-21swapper/007:25:160
28770997962,10cyclictest14-21ksoftirqd/007:10:130
28770997950,17cyclictest14-21ksoftirqd/009:15:170
28770997851,18cyclictest14-21ksoftirqd/009:10:190
28770997846,18cyclictest0-21swapper/011:00:250
28770997845,24cyclictest14-21ksoftirqd/008:15:230
28770997646,17cyclictest14-21ksoftirqd/012:35:210
28770997547,18cyclictest0-21swapper/011:25:230
28770997450,13cyclictest0-21swapper/012:20:210
28770997444,17cyclictest14-21ksoftirqd/008:35:270
28770997442,22cyclictest0-21swapper/010:45:270
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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