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2021-10-24 - 02:20

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
Characteristics of the 20 highest latencies:
System rackdslot3.osadl.org (updated Fri Oct 15, 2021 12:46:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1980821750,8sleep2136499cyclictest11:30:242
9492139117,9sleep30-21swapper/307:09:493
69929473,9sleep20-21swapper/207:06:452
76828664,10sleep10-21swapper/107:07:331
1364998273,6cyclictest33-21ksoftirqd/210:45:132
9562793,18sleep00-21swapper/007:09:540
1363997964,6cyclictest25-21ksoftirqd/111:50:121
101432790,9sleep2136499cyclictest09:20:082
1364997151,11cyclictest33-21ksoftirqd/208:20:142
1360997132,10cyclictest9-21ksoftirqd/012:30:000
246142700,4sleep224617-21timerandwakeup12:15:292
68012690,2sleep30-21swapper/311:15:123
34152690,8sleep1136399cyclictest08:30:161
128391680,1ptp4l391rcuc/308:18:303
81592670,2sleep00-21swapper/007:55:260
1360996528,8cyclictest9-21ksoftirqd/008:35:100
1360996528,8cyclictest9-21ksoftirqd/008:35:100
101612650,3sleep10-21swapper/107:20:061
1360996429,8cyclictest9-21ksoftirqd/010:15:210
1360996326,8cyclictest9-21ksoftirqd/010:00:140
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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