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2022-10-03 - 03:05

x86 Intel Atom E3950 @1600 MHz, Linux 5.6.19-rt12 (Profile)

Latency plot of system in rack #9, slot #2
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 -Sp99 -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 rack9slot2 (updated Mon Oct 03, 2022 00:43:24)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
121972251181,25sleep10-21swapper/11
122542243183,46sleep30-21swapper/33
119842240176,52sleep00-21swapper/00
103652230191,25sleep20-21swapper/22
173152490,1sleep30-21swapper/33
287242430,1sleep028319-21/usr/sbin/munin0
97732410,2sleep335-21ksoftirqd/33
1251999389,10cyclictest30296-21sed1
162312350,2sleep20-21swapper/22
1251999358,10cyclictest733-21ntpq1
1251999349,9cyclictest16297-21cat1
1251999339,9cyclictest10534-21grep1
1251999337,10cyclictest18561-21sh1
1251999337,10cyclictest18561-21sh1
1251999314,16cyclictest0-21swapper/11
1251999304,8cyclictest0-21swapper/11
1251999296,9cyclictest665-21runrttasks1
1251999294,10cyclictest0-21swapper/11
12524992713,12cyclictest3355-21seq2
12524992713,12cyclictest3355-21seq2
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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