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2019-07-22 - 07:36

Intel(R) Atom(TM) CPU D2700 @ 2.13GHz, Linux 4.4.39-rt50 (Profile)

Latency plot of system in rack #1, slot #6
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
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rack1slot6.osadl.org (updated Mon Jul 22, 2019 00:43:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81700,0rcu_preempt29-21ksoftirqd/220:54:392
81610,0rcu_preempt29-21ksoftirqd/221:46:042
81600,0rcu_preempt37-21ksoftirqd/321:14:073
91590,0rcu_sched3-21ksoftirqd/021:24:350
81590,0rcu_preempt37-21ksoftirqd/321:24:453
91580,0rcu_sched21-21ksoftirqd/100:39:391
81570,0rcu_preempt29-21ksoftirqd/222:54:582
81570,0rcu_preempt29-21ksoftirqd/221:04:402
81570,0rcu_preempt29-21ksoftirqd/200:26:592
81560,0rcu_preempt29-21ksoftirqd/221:19:412
81550,0rcu_preempt37-21ksoftirqd/321:44:313
81550,0rcu_preempt29-21ksoftirqd/220:14:402
81550,0rcu_preempt21-21ksoftirqd/123:24:431
81540,0rcu_preempt37-21ksoftirqd/323:19:593
81540,0rcu_preempt37-21ksoftirqd/323:00:393
81540,0rcu_preempt30121-21gltestperf21:24:451
81540,0rcu_preempt29-21ksoftirqd/221:59:402
81540,0rcu_preempt29-21ksoftirqd/200:19:392
81540,0rcu_preempt21-21ksoftirqd/119:09:451
81530,0rcu_preempt37-21ksoftirqd/323:06:463
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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