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2022-01-23 - 10:22

AMD Ryzen Threadripper 1950X 16-Core Processor, 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 10 highest latencies:
System rackcslot8.osadl.org (updated Sun Jan 23, 2022 00:50:42)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
90159931683,36cyclictest161-21ksoftirqd/2422:01:4117
2096912830,276ptp4l0-21swapper/119:09:381
89369922428,21cyclictest151rcu_preempt22:03:3330
90159919127,94cyclictest0-21swapper/2423:35:2417
89729919013,150cyclictest0-21swapper/1522:40:577
89729918813,131cyclictest0-21swapper/1521:52:197
89729917713,103cyclictest0-21swapper/1522:46:187
89999917029,128cyclictest0-21swapper/2020:30:2613
89999916929,88cyclictest0-21swapper/2022:31:4213
89999916929,88cyclictest0-21swapper/2000:07:5313
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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