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2019-07-24 - 00:38

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

Latency plot of system in rack #d, slot #1
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 rackdslot1.osadl.org (updated Tue Jul 23, 2019 12:45:37)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1281911940,16ptp4l0-21swapper/107:07:191
1281911860,17ptp4l0-21swapper/007:06:250
1281911800,15ptp4l0-21swapper/207:08:102
1281911670,10ptp4l0-21swapper/307:05:113
989499818,14cyclictest13231-21grep07:15:163
989499789,13cyclictest618-21cstates11:10:073
9894997710,12cyclictest3760-21grep08:15:063
989499768,14cyclictest29753-21fschecks_time09:20:063
9893997664,7cyclictest33-21ksoftirqd/210:25:052
989199768,12cyclictest30656-21ntpq08:00:110
9894997411,12cyclictest26725-21ntpq07:50:163
989199748,12cyclictest19943-21grep10:15:200
989499737,14cyclictest25076-21sed10:30:003
989199738,12cyclictest16238-21cut07:25:060
989499726,14cyclictest10893-21apt-config09:55:023
9893997262,6cyclictest33-21ksoftirqd/207:15:032
9893997261,6cyclictest33-21ksoftirqd/209:10:072
9893997232,5cyclictest33-21ksoftirqd/209:45:002
989199727,10cyclictest10333-21ps08:30:140
989199725,13cyclictest5744-21grep08:20:070
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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