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2021-10-24 - 01:46

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 Sun Oct 24, 2021 00:43:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
91670,0rcu_sched3-21ksoftirqd/023:38:270
91660,0rcu_sched21-21ksoftirqd/121:08:291
2699580,0migration/225615-21timerandwakeup19:03:542
91570,0rcu_sched3-21ksoftirqd/019:08:230
81570,0rcu_preempt3-21ksoftirqd/000:38:270
3499570,0migration/325790-21unixbench_singl19:03:563
81560,0rcu_preempt21-21ksoftirqd/120:54:011
81560,0rcu_preempt21-21ksoftirqd/119:38:551
81550,0rcu_preempt21-21ksoftirqd/122:54:041
81550,0rcu_preempt21-21ksoftirqd/100:04:021
81540,0rcu_preempt21-21ksoftirqd/120:13:501
81540,0rcu_preempt21-21ksoftirqd/120:13:281
81540,0rcu_preempt21-21ksoftirqd/119:08:291
81540,0rcu_preempt21-21ksoftirqd/100:08:581
81530,0rcu_preempt29-21ksoftirqd/222:56:082
81530,0rcu_preempt21-21ksoftirqd/121:23:571
81530,0rcu_preempt21-21ksoftirqd/121:23:571
81520,0rcu_preempt29-21ksoftirqd/219:08:452
91510,0rcu_sched3-21ksoftirqd/023:18:270
91510,0rcu_sched21-21ksoftirqd/100:38:271
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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