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2019-07-16 - 02:12

Intel(R) Atom(TM) Processor E3940 @ 1.60GHz, Linux 4.19.50-rt22 (Profile)

Latency plot of system in rack #9, slot #3
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 -Up99 -i200 -h400 -q
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rack9slot3 (updated Mon Jul 15, 2019 00:37:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
922327506075023,24sleep20-21swapper/219:04:582
905621490814871,25sleep00-21swapper/019:02:520
918221236912334,23sleep30-21swapper/319:04:273
9103287768741,23sleep10-21swapper/119:03:251
860321520,3sleep0949899cyclictest00:25:010
2619821520,3sleep3950299cyclictest19:46:183
267942770,2sleep10-21swapper/121:07:301
9502996822,19cyclictest41-21ksoftirqd/300:19:513
9501996630,4cyclictest33-21ksoftirqd/222:03:132
9502996358,3cyclictest41-21ksoftirqd/323:29:223
9502996156,3cyclictest41-21ksoftirqd/320:21:473
9501996128,10cyclictest33-21ksoftirqd/200:14:562
950199610,2cyclictest121rcu_preempt19:41:092
9502995933,8cyclictest41-21ksoftirqd/323:59:463
9502995932,4cyclictest41-21ksoftirqd/321:57:583
9502995932,4cyclictest41-21ksoftirqd/319:41:123
9498995954,3cyclictest11890-21cron00:34:580
9501995828,9cyclictest33-21ksoftirqd/223:54:372
9501995825,6cyclictest33-21ksoftirqd/222:18:092
9502995725,4cyclictest41-21ksoftirqd/323:49:363
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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