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2021-09-27 - 06:40

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 20 highest latencies:
System rackcslot8.osadl.org (updated Mon Sep 27, 2021 00:49:25)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
153092353344,6sleep230-21swapper/2319:05:2216
166132335327,6sleep150-21swapper/1519:06:517
1827599314117,2cyclictest151rcu_preempt23:01:3116
2096912890,281ptp4l0-21swapper/119:06:331
183049917827,85cyclictest0-21swapper/2700:20:2520
18228991460,85cyclictest0-21swapper/1700:06:219
18235991450,84cyclictest0-21swapper/1821:45:1810
181759914430,81cyclictest0-21swapper/1022:09:122
182289914139,52cyclictest0-21swapper/1721:25:309
18122991410,89cyclictest0-21swapper/323:05:1223
181759914027,75cyclictest0-21swapper/1022:25:142
18131991400,85cyclictest0-21swapper/421:42:2526
181759913928,86cyclictest0-21swapper/1023:39:302
18175991390,86cyclictest0-21swapper/1022:03:202
181679913747,56cyclictest0-21swapper/900:20:0831
18131991370,85cyclictest0-21swapper/421:13:5326
182289913633,91cyclictest0-21swapper/1723:31:389
181679913651,57cyclictest0-21swapper/922:45:4831
181679913644,60cyclictest0-21swapper/922:19:2831
18122991368,120cyclictest151rcu_preempt19:46:2523
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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