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2021-11-28 - 04:01

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
Characteristics of the 20 highest latencies:
System rackdslot4.osadl.org (updated Sun Nov 28, 2021 00:46:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3039923530,4sleep20-21swapper/219:05:162
1091021440,5sleep23256399cyclictest22:40:232
120791127105,9phc2sys0-21swapper/319:05:473
312942780,3sleep20-21swapper/222:25:252
312942780,3sleep20-21swapper/222:25:252
32563997464,6cyclictest33-21ksoftirqd/219:10:112
269642740,9sleep33256499cyclictest19:40:203
317892714,12sleep00-21swapper/019:05:550
120891710,4ptp4l401ktimersoftd/319:10:013
24722700,5sleep23256399cyclictest22:30:182
187152700,8sleep23256399cyclictest22:10:182
32563996961,4cyclictest33-21ksoftirqd/223:40:122
32563996961,4cyclictest33-21ksoftirqd/223:40:112
32563996958,6cyclictest33-21ksoftirqd/223:55:142
32563996956,6cyclictest33-21ksoftirqd/219:55:112
319062681,11sleep10-21swapper/119:07:221
32563996756,6cyclictest33-21ksoftirqd/221:20:152
32561996732,7cyclictest9-21ksoftirqd/022:20:330
185442660,2sleep30-21swapper/320:50:193
98182650,2sleep30-21swapper/300:00:053
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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