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2022-07-01 - 00:45

x86 Intel Core i7-2600K @3400 MHz, Linux 5.15.7-rt23 (Profile)

Latency plot of system in rack #4, 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 -h200 -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 10 highest latencies:
System rack4slot6.osadl.org (updated Fri Dec 24, 2021 02:27:54)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
8059521280,0pltrace0-21swapper/322:56:463
3152921260,0sleep10-21swapper/122:10:241
2927221220,0sleep30-21swapper/323:20:203
30866521200,110pltrace0-21swapper/319:05:143
1265521030,94pltrace0-21swapper/519:10:015
3086652980,88pltrace0-21swapper/719:05:217
126552900,86pltrace0-21swapper/119:06:481
119328368,10sleep20-21swapper/219:05:592
128727661,10sleep40-21swapper/419:06:574
3178352730,1pltrace44-21ksoftirqd/420:56:454
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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