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2019-07-22 - 08:03

Intel(R) Atom(TM) CPU E3845 @ 1.91GHz, Linux 4.19.37-rt19 (Profile)

Latency plot of system in rack #d, slot #4
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
The worst-case latency is NOT higher under extreme CPU load.
Results of all systems under extreme CPU load are combined on this summary graph.
Characteristics of the 20 highest latencies:
System rackdslot4.osadl.org (updated Mon Jul 22, 2019 00:45:38)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
564982000,10rtkit-daemon563-21rtkit-daemon19:05:232
1317911900,100ptp4l41-21ksoftirqd/319:05:503
29022999886,7cyclictest9-21ksoftirqd/023:10:060
17662970,2sleep21767-21/usr/sbin/munin22:05:072
152142910,2sleep20-21swapper/200:00:002
152142910,2sleep20-21swapper/200:00:002
29026998311,14cyclictest6861-21tr19:35:041
29022998237,8cyclictest9-21ksoftirqd/023:15:010
29026998113,12cyclictest22571-21grep21:35:091
29026998015,13cyclictest9311-21uname19:40:091
2902699779,13cyclictest1005-21sed23:25:001
29026997710,14cyclictest8355-21sed23:40:111
29022997751,20cyclictest9-21ksoftirqd/019:45:020
29022997665,5cyclictest9-21ksoftirqd/021:10:020
29026997511,13cyclictest29305-21cstates19:10:051
2902699748,13cyclictest29448-21sed00:35:001
2902699739,13cyclictest12467-21perl21:10:071
2902699729,13cyclictest6864-21awk23:35:141
2902699729,13cyclictest21376-21latency_hist22:55:011
2902699729,10cyclictest17329-21cat00:05:011
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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