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2022-10-04 - 09:27

x86 Intel Core i7-2600K @3400 MHz, Linux 5.9.0-rc2-rt1 (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 20 highest latencies:
System rack4slot6.osadl.org (updated Tue Oct 04, 2022 00:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
8004521190,109pltrace0-21swapper/219:06:292
10815521190,104pltrace0-21swapper/019:06:400
1081552960,86pltrace0-21swapper/419:10:004
800452950,89pltrace0-21swapper/619:06:006
208752840,0pltrace0-21swapper/200:26:312
1089428349,12sleep70-21swapper/719:07:327
1097528165,12sleep30-21swapper/319:08:423
1087927660,12sleep10-21swapper/119:07:191
2625752690,0pltrace0-21swapper/323:41:303
1088326852,12sleep50-21swapper/519:07:235
2623052640,0pltrace0-21swapper/723:06:317
35242620,0sleep20-21swapper/222:06:252
284042590,0sleep10-21swapper/122:35:001
11322992411,12cyclictest0-21swapper/421:25:254
83082230,0sleep20-21swapper/222:11:382
254752200,0sleep30-21swapper/321:20:183
140682190,1sleep40-21swapper/422:54:504
11322991917,1cyclictest0-21swapper/400:10:304
1132299190,1cyclictest0-21swapper/423:40:274
8832180,0sleep40-21swapper/423:50:194
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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