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2022-10-04 - 09:08

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 Oct 04, 2022 00:44:20)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
24756991024,9cyclictest7264-21ssh00:12:320
23437210120,40sleep30-21swapper/319:02:443
2475699973,14cyclictest11051-21sort20:02:380
2475699972,13cyclictest5741-21fschecks_time21:17:400
2475699972,12cyclictest31838-21idleruntime-cro21:07:130
2475699972,12cyclictest31838-21idleruntime-cro21:07:130
24768999438,26cyclictest141rcu_preempt23:19:401
24768999436,30cyclictest141rcu_preempt23:22:491
2475699942,12cyclictest11422-21fschecks_time21:27:420
2475699942,12cyclictest11422-21fschecks_time21:27:420
24756999353,12cyclictest141rcu_preempt22:07:370
24756999353,12cyclictest141rcu_preempt22:07:370
2475699913,9cyclictest18504-21apt-get22:37:330
2475699913,7cyclictest18084-21apt-get00:32:260
2475699913,77cyclictest3294-21mailstats21:12:490
2475699913,12cyclictest25633-21ssh23:47:330
2475699913,10cyclictest26832-21chrt22:52:270
2475699912,8cyclictest9082-21/usr/sbin/munin23:17:400
24777999052,10cyclictest141rcu_preempt19:22:542
24777999052,10cyclictest141rcu_preempt19:22:542
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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