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2023-02-08 - 04:52

x86 Intel Atom E3845 @1910 MHz, Linux 4.19.37-rt19 (Profile)

Latency plot of system in rack #d, slot #3
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 10 highest latencies:
System rackdslot3.osadl.org (updated Wed Feb 08, 2023 00:46:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1986021670,2sleep00-21swapper/000:25:250
825991123101,10phc2sys0-21swapper/319:06:443
31227210381,10sleep20-21swapper/219:07:052
31740998010,16cyclictest9306-21latency_hist00:05:012
57698790,7rtkit-daemon22308-21apache219:09:310
31741997835,5cyclictest41-21ksoftirqd/300:05:013
311732789,19sleep10-21swapper/119:06:271
31740997612,13cyclictest5210-21grep22:45:292
31741997533,8cyclictest41-21ksoftirqd/323:35:183
31740997510,20cyclictest8990-21cpuspeed_turbos19:30:212
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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