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2023-05-28 - 18:18

x86 Intel Xeon E5620 @2400 MHz, Linux 4.19.127-rt55 (Profile)

Latency plot of system in rack #c, slot #0
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 -Up99 -i200 -h400 --smi -q
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Characteristics of the 20 highest latencies:
System rackcslot0.osadl.org (updated Sun May 28, 2023 00:43:41)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
398821410,0sleep100-21swapper/1021:12:422
24722135106,22sleep90-21swapper/919:17:1015
2438121290,5sleep14694999cyclictest23:22:296
64192125104,16sleep80-21swapper/819:21:2614
61922125105,15sleep110-21swapper/1119:19:053
6292212491,28sleep120-21swapper/1219:20:264
62642123102,16sleep10-21swapper/119:19:591
62502123103,15sleep70-21swapper/719:19:4913
6126211890,22sleep20-21swapper/219:18:078
6436211790,21sleep40-21swapper/419:21:3810
62592115102,8sleep140-21swapper/1419:19:566
6278210490,9sleep150-21swapper/1519:20:137
171962960,2sleep00-21swapper/022:37:510
171962960,2sleep00-21swapper/022:37:510
234092940,1sleep70-21swapper/721:37:3113
614129274,4sleep00-21swapper/019:18:220
644428981,4sleep100-21swapper/1019:21:442
628628872,4sleep60-21swapper/619:20:2012
613728875,8sleep130-21swapper/1319:18:195
622828772,11sleep50-21swapper/519:19:3111
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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