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2019-07-16 - 02:40

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

Latency plot of system in rack #d, slot #2
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 rackdslot2.osadl.org (updated Mon Jul 15, 2019 00:45:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
562981520,10rtkit-daemon561-21rtkit-daemon19:05:521
1848391137113,11phc2sys0-21swapper/319:07:543
2104999972,38cyclictest30270-21grep22:10:203
21045999178,7cyclictest9-21ksoftirqd/020:10:070
21045998876,6cyclictest9-21ksoftirqd/023:10:020
21045998876,6cyclictest9-21ksoftirqd/023:10:020
21045998371,6cyclictest9-21ksoftirqd/000:05:040
21048998166,8cyclictest33-21ksoftirqd/222:35:042
21048998139,5cyclictest33-21ksoftirqd/200:40:002
21045998172,4cyclictest9-21ksoftirqd/023:15:050
21048998035,7cyclictest33-21ksoftirqd/219:40:002
21045998069,5cyclictest9-21ksoftirqd/023:25:050
21048997971,5cyclictest33-21ksoftirqd/221:10:042
21048997941,5cyclictest33-21ksoftirqd/220:15:042
21048997940,4cyclictest33-21ksoftirqd/220:10:192
21048997939,4cyclictest33-21ksoftirqd/219:30:062
21048997865,6cyclictest33-21ksoftirqd/219:45:032
21048997864,7cyclictest33-21ksoftirqd/200:20:022
21048997841,8cyclictest33-21ksoftirqd/222:15:172
21048997840,4cyclictest33-21ksoftirqd/220:00:152
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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