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2023-05-31 - 02:31

ARM 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 20 highest latencies:
System rackbslot7 (updated Tue May 30, 2023 12:44:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
267259910758,39cyclictest11747-21idleruntime-cro12:11:412
2540521056,16sleep20-21swapper/207:02:082
2540521056,16sleep20-21swapper/207:02:082
26725999411,75cyclictest32304-21apt-get10:56:532
26734999247,21cyclictest141rcu_preempt10:31:423
26725998810,49cyclictest30274-21grep10:52:182
26734998747,13cyclictest141rcu_preempt12:07:213
26712998737,27cyclictest122-21pr/ttymxc010:58:440
26734998549,22cyclictest141rcu_preempt11:53:183
26712998557,22cyclictest628-21fschecks_time11:52:220
2672599834,55cyclictest15926-21apt-get09:32:052
26734998247,16cyclictest141rcu_preempt10:47:173
26712998245,13cyclictest141rcu_preempt10:32:390
2672599815,52cyclictest32273-21journal-offline07:21:582
2672599812,45cyclictest29832-21awk11:47:012
2672599812,45cyclictest29832-21awk11:47:012
2672599804,63cyclictest19566-21cut08:22:112
26716998053,9cyclictest25-21ksoftirqd/108:57:101
26716998047,10cyclictest25-21ksoftirqd/109:38:271
26734997831,10cyclictest141rcu_preempt10:17:253
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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