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2021-09-27 - 05:24

Intel(R) Atom(TM) Processor E3940 @ 1.60GHz, Linux 5.2.21-rt13 (Profile)

Latency plot of system in rack #9, 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 -q
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rack9slot3 (updated Wed Oct 02, 2019 00:45:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
35452246171,19sleep20-21swapper/219:07:562
36162244170,45sleep10-21swapper/119:08:501
36182233169,54sleep30-21swapper/319:08:523
35132223193,19sleep00-21swapper/019:07:300
69442510,8sleep2321ktimersoftd/223:10:192
3912994919,6cyclictest33-21ksoftirqd/221:35:042
3912994844,2cyclictest33-21ksoftirqd/221:20:142
3912994742,3cyclictest33-21ksoftirqd/221:10:172
391299472,3cyclictest121rcu_preempt21:18:232
3912994621,3cyclictest33-21ksoftirqd/222:55:012
391299460,7cyclictest33-21ksoftirqd/222:38:372
3912994541,3cyclictest33-21ksoftirqd/200:10:012
3912994540,3cyclictest33-21ksoftirqd/219:45:132
3912994540,2cyclictest33-21ksoftirqd/220:20:172
3912994523,8cyclictest33-21ksoftirqd/222:15:092
3912994440,2cyclictest33-21ksoftirqd/223:39:592
3912994439,3cyclictest33-21ksoftirqd/220:50:062
3912994420,3cyclictest33-21ksoftirqd/221:40:162
3912994414,6cyclictest33-21ksoftirqd/221:10:002
391299440,5cyclictest121rcu_preempt22:05:172
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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