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2022-05-26 - 20:07

x86 AMD 1950X @3700 MHz, Linux 5.10.47-rt46 (Profile)

Latency plot of system in rack #c, slot #8
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 rackcslot8.osadl.org (updated Fri May 20, 2022 00:48:57)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
239859930386,199cyclictest151rcu_preempt23:07:110
240379924143,1cyclictest151rcu_preempt21:38:122
2642912320,221ptp4l0-21swapper/119:05:201
215402223214,7sleep240-21swapper/2419:05:2217
268191204196,6phc2sys0-21swapper/219:07:1412
2403199202128,1cyclictest151rcu_preempt22:47:5930
24054991930,140cyclictest0-21swapper/1422:16:446
24087991607,131cyclictest0-21swapper/2023:30:0113
24087991606,124cyclictest0-21swapper/2020:10:0013
24087991597,92cyclictest0-21swapper/2021:41:5513
24087991587,111cyclictest0-21swapper/2023:13:2513
24087991557,147cyclictest0-21swapper/2023:40:1513
24087991537,145cyclictest0-21swapper/2000:25:2813
241659914825,85cyclictest0-21swapper/3100:18:5225
24087991457,87cyclictest0-21swapper/2022:35:5013
24087991456,102cyclictest0-21swapper/2021:30:4413
24087991420,87cyclictest0-21swapper/2021:23:4413
24087991420,87cyclictest0-21swapper/2021:23:4413
24153991380,85cyclictest0-21swapper/2922:54:5722
24087991386,94cyclictest0-21swapper/2022:30:0013
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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