You are here: Home / Projects / QA Farm Realtime / Latency plots / 
2022-01-23 - 09:34

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 10 highest latencies:
System rack1slot6.osadl.org (updated Sun Jan 23, 2022 00:43:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
91570,0rcu_sched29-21ksoftirqd/220:15:402
81560,0rcu_preempt29-21ksoftirqd/200:25:392
81550,0rcu_preempt29-21ksoftirqd/223:50:392
81540,0rcu_preempt29-21ksoftirqd/221:36:122
81540,0rcu_preempt29-21ksoftirqd/220:36:162
81530,0rcu_preempt37-21ksoftirqd/300:16:113
81530,0rcu_preempt29-21ksoftirqd/220:16:122
3499530,0migration/33503-21cpuspeed_turbos19:00:563
81520,0rcu_preempt37-21ksoftirqd/323:15:403
81520,0rcu_preempt37-21ksoftirqd/321:56:163
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

Valid XHTML 1.0 Transitional