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2023-02-06 - 08:08

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 50 highest latencies:
System rack9slot2 (updated Mon Feb 06, 2023 00:43:24)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
200312259193,24sleep00-21swapper/00
2017999256250,3cyclictest24671-21sendmail0
2019399241233,5cyclictest24663-21sendmail3
199822231198,23sleep10-21swapper/11
197862230191,26sleep30-21swapper/33
197702230193,25sleep20-21swapper/22
2018999227220,4cyclictest505-21dbus-daemon2
2018499147140,4cyclictest24652-21munin-run1
146892470,2sleep00-21swapper/00
313572310,2sleep10-21swapper/11
20184993020,3cyclictest21-21ksoftirqd/11
20184993020,3cyclictest21-21ksoftirqd/11
2017999261,23cyclictest5913-21kworker/0:10
2018499254,2cyclictest111rcu_preempt1
60912240,2sleep26077-21cron2
278722240,5sleep3322-21systemd-journal3
2018499246,2cyclictest111rcu_preempt1
63842230,2sleep30-21swapper/33
20193992316,4cyclictest1837-21cron3
2019399231,19cyclictest31277-21tr3
2018999233,17cyclictest4106-21latency_hist2
2018999231,19cyclictest25151-21munin-run2
20189992310,10cyclictest10439-21expr2
20184992318,3cyclictest21-21ksoftirqd/11
20179992311,10cyclictest12569-21wc0
20193992217,3cyclictest35-21ksoftirqd/33
20193992215,4cyclictest665-21runrttasks3
20193992214,3cyclictest4103-21cron3
2018999224,16cyclictest6801-21cat2
20189992216,4cyclictest26468-21cat2
20189992216,3cyclictest13737-21cut2
2018999221,18cyclictest11268-21munin-run2
20184992217,3cyclictest10416-21tr1
20184992216,4cyclictest1293-21df_inode1
20179992217,3cyclictest14001-21ls0
20179992216,3cyclictest32610-21grep0
105742220,2sleep10-21swapper/11
20193992116,3cyclictest22664-21head3
20193992115,4cyclictest13932-21sed3
20193992114,4cyclictest29845-21sh3
20189992116,3cyclictest4434-21ntp_kernel_err2
20189992116,3cyclictest16087-21if_err_enp2s02
20189992115,4cyclictest9669-21open_files2
20189992115,4cyclictest7900-21seq2
20189992115,4cyclictest30946-21seq2
20189992115,4cyclictest18398-21seq2
20189992115,4cyclictest11644-21grep2
20189992115,3cyclictest6703-21if_err_enp3s02
20189992115,3cyclictest16713-21head2
2018999211,18cyclictest21687-21perf2
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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