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2021-11-28 - 03:27

Intel(R) Core(TM) i9-9900K CPU @ 3.60GHz, Linux 5.10.21-rt34 (Profile)

Latency plot of system in rack #0, 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 -Up99 -i200 -h400 -q done
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 rack0slot8.osadl.org (updated Sun Nov 28, 2021 00:45:02)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
409564899446438,5cyclictest0-21swapper/1419:40:536
409563699436436,0cyclictest0-21swapper/619:54:3312
409563699432426,2cyclictest4127295-21kworker/u32:219:40:5312
409562899432423,6cyclictest4114134-21kworker/0:119:56:150
409562899425421,4cyclictest4114134-21kworker/0:119:40:520
409564899422421,1cyclictest107992-21kworker/u32:322:45:366
4095639994209,409cyclictest0-21swapper/819:41:4514
409564699419418,1cyclictest10276-21thunderbird19:19:524
409563699419419,0cyclictest0-21swapper/619:35:3012
409563499419418,1cyclictest23450irq/127-xhci_hc19:19:5210
4095648994189,409cyclictest0-21swapper/1422:33:586
4095648994189,409cyclictest0-21swapper/1422:33:586
409564999417411,4cyclictest0-21swapper/1522:40:007
409563799417416,1cyclictest0-21swapper/719:39:5513
409563799417415,2cyclictest4131989-21turbostat19:50:0013
409563299417415,0cyclictest0-21swapper/219:47:358
409564699416416,0cyclictest0-21swapper/1219:47:354
409563499416415,1cyclictest23450irq/127-xhci_hc19:47:3510
409563499416415,1cyclictest23450irq/127-xhci_hc19:12:1310
409564699415415,0cyclictest0-21swapper/1219:12:134
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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