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2021-07-26 - 18:22

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 26, 2021 12:43:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
91630,0rcu_sched29-21ksoftirqd/208:17:512
81610,0rcu_preempt29-21ksoftirqd/211:57:522
91600,0rcu_sched3-21ksoftirqd/012:47:530
91600,0rcu_sched29-21ksoftirqd/212:12:522
81600,0rcu_preempt3-21ksoftirqd/010:02:510
81600,0rcu_preempt3-21ksoftirqd/008:23:080
81600,0rcu_preempt29-21ksoftirqd/208:57:512
81590,0rcu_preempt29-21ksoftirqd/207:18:152
81590,0rcu_preempt29-21ksoftirqd/207:18:152
81580,0rcu_preempt37-21ksoftirqd/310:07:523
81580,0rcu_preempt3-21ksoftirqd/012:12:520
81580,0rcu_preempt3-21ksoftirqd/010:03:290
81580,0rcu_preempt29-21ksoftirqd/211:42:472
81580,0rcu_preempt29-21ksoftirqd/209:05:462
81570,0rcu_preempt37-21ksoftirqd/312:27:523
81570,0rcu_preempt37-21ksoftirqd/312:27:523
81570,0rcu_preempt29-21ksoftirqd/212:07:532
81570,0rcu_preempt29-21ksoftirqd/211:13:092
81570,0rcu_preempt29-21ksoftirqd/209:37:522
81570,0rcu_preempt21-21ksoftirqd/109:52:521
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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