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2019-07-16 - 02:44

Intel(R) Atom(TM) CPU E3845 @ 1.91GHz, 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
The worst-case latency is about 1.00 times 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 rackdslot3.osadl.org (updated Mon Jul 15, 2019 00:45:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1942121690,6sleep02666399cyclictest22:50:310
28041911080,45ptp4l401ktimersoftd/319:07:313
56598870,61rtkit-daemon24227-21apache219:08:192
2666399770,4cyclictest32737-21grep23:25:120
2666699703,3cyclictest121rcu_preempt00:35:023
26666997027,11cyclictest41-21ksoftirqd/320:20:003
26666997011,4cyclictest41-21ksoftirqd/323:50:013
2666399700,28cyclictest32622-21cat19:25:010
26666996958,6cyclictest41-21ksoftirqd/323:50:063
2666399690,28cyclictest29950-21date22:00:000
26666996860,4cyclictest41-21ksoftirqd/322:10:033
26665996855,8cyclictest33-21ksoftirqd/219:55:032
2666499670,26cyclictest1903-21seq19:26:221
129522670,1sleep00-21swapper/022:35:140
2666499661,61cyclictest14895-21grep00:00:151
261632664,50sleep00-21swapper/019:06:300
2666699650,6cyclictest0-21swapper/322:40:033
2804191640,3ptp4l15996-21kworker/3:220:41:113
26666996457,4cyclictest41-21ksoftirqd/322:00:123
26666996353,6cyclictest41-21ksoftirqd/320:20:043
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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