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2022-05-28 - 15:28

x86 Intel Atom D2700 @2130 MHz, 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 Sat May 28, 2022 12:43:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81650,0rcu_preempt21-21ksoftirqd/112:23:281
1899600,0migration/112026-21gltestperf07:03:421
91590,0rcu_sched4483-21sh08:08:281
81590,0rcu_preempt21-21ksoftirqd/107:18:511
81580,0rcu_preempt21-21ksoftirqd/107:33:531
91570,0rcu_sched21-21ksoftirqd/109:03:231
81550,0rcu_preempt21-21ksoftirqd/111:59:281
81550,0rcu_preempt21-21ksoftirqd/111:33:231
91540,0rcu_sched21-21ksoftirqd/107:43:281
81540,0rcu_preempt21-21ksoftirqd/108:03:281
81530,0rcu_preempt37-21ksoftirqd/307:33:293
81530,0rcu_preempt37-21ksoftirqd/307:13:453
81530,0rcu_preempt3-21ksoftirqd/011:17:210
81530,0rcu_preempt3-21ksoftirqd/008:18:290
81530,0rcu_preempt21-21ksoftirqd/109:33:281
81520,0rcu_preempt3-21ksoftirqd/007:03:450
81520,0rcu_preempt21-21ksoftirqd/107:23:571
81510,0rcu_preempt37-21ksoftirqd/310:03:233
81510,0rcu_preempt37-21ksoftirqd/308:53:283
81510,0rcu_preempt37-21ksoftirqd/308:53:283
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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