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2022-05-29 - 13:22

Freescale i.MX6 Quad @996 MHz, Linux 5.16.2-rt19 (Profile)

Latency plot of system in rack #b, slot #7
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 10 highest latencies:
System rackbslot7 (updated Sun May 29, 2022 00:44:18)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
12417210013,52sleep01-21systemd19:07:290
1253799966,57cyclictest20473-21apt-get22:52:382
1244029430,30sleep20-21swapper/219:07:312
12529999156,28cyclictest27407-21fschecks_count23:02:481
12521999022,54cyclictest20927-21ssh22:52:470
12521999015,48cyclictest15780-21taskset21:52:420
12537998912,61cyclictest28822-40mandb23:57:292
12537998912,61cyclictest28822-40mandb23:57:292
12529998648,31cyclictest19604-21diskmemload21:22:441
12521998625,24cyclictest24584-21/usr/sbin/munin22:57:530
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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