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2023-02-06 - 14:04

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 Mon Feb 06, 2023 00:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
253529911260,45cyclictest15991-21sh20:16:162
24436210615,47sleep224468-21ps19:01:572
24436210615,47sleep224468-21ps19:01:572
583021000,6chrt5829-21ssh21:16:083
25352999458,13cyclictest33-21ksoftirqd/223:01:382
25341999237,10cyclictest12-21ksoftirqd/020:26:190
25341999237,10cyclictest12-21ksoftirqd/020:26:190
25352998644,31cyclictest33-21ksoftirqd/220:31:192
25355998541,14cyclictest141rcu_preempt00:26:183
25352998536,26cyclictest33-21ksoftirqd/221:27:132
2535299847,25cyclictest21255-21/usr/sbin/munin20:31:342
2447128220,27sleep30-21swapper/319:01:583
2447128220,27sleep30-21swapper/319:01:583
2389128227,27sleep10-21swapper/119:01:351
2389128227,27sleep10-21swapper/119:01:351
25355998131,23cyclictest141rcu_preempt21:58:143
25355998061,12cyclictest2998-21sendmail19:36:163
25355998054,15cyclictest21324-21runrttasks00:26:273
25355998054,15cyclictest21324-21runrttasks00:26:273
25352997957,12cyclictest15807-21runrttasks22:26:392
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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