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2023-05-28 - 21:54

x86 Intel Atom E3845 @1910 MHz, Linux 4.19.37-rt19 (Profile)

Latency plot of system in rack #d, slot #2
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 --smi -q
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Characteristics of the 20 highest latencies:
System rackdslot2.osadl.org (updated Sun May 28, 2023 12:46:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1767321570,1sleep10-21swapper/109:25:321
1339911070,4ptp4l401ktimersoftd/307:08:593
55498780,45rtkit-daemon14334-21apache207:09:280
133991770,1ptp4l401ktimersoftd/309:00:503
180332765,13sleep10-21swapper/107:06:531
236662750,6sleep023672-21cpuspeed_turbos08:30:210
194682750,4sleep11313-21lldpd10:40:211
133991740,2ptp4l401ktimersoftd/309:50:353
133991700,2ptp4l401ktimersoftd/311:48:063
18567996654,6cyclictest41-21ksoftirqd/312:10:193
133991660,2ptp4l30360-21kworker/3:112:25:553
133991660,1ptp4l401ktimersoftd/311:56:353
159962640,5sleep31274-21snmpd10:30:473
133991640,2ptp4l401ktimersoftd/310:58:173
133991640,2ptp4l401ktimersoftd/310:58:173
133991640,1ptp4l401ktimersoftd/307:40:223
133991630,1ptp4l401ktimersoftd/310:54:133
133991620,1ptp4l401ktimersoftd/310:29:153
133991620,1ptp4l401ktimersoftd/307:34:243
18566996124,9cyclictest33-21ksoftirqd/208:22:042
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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