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2023-01-29 - 07:23

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

Latency plot of system in rack #d, slot #4
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 rackdslot4.osadl.org (updated Sun Jan 29, 2023 00:46:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1299911820,6ptp4l401ktimersoftd/319:06:363
13192880,8sleep02255699cyclictest20:40:320
254802830,2sleep20-21swapper/220:25:162
56498680,11rtkit-daemon0-21swapper/219:09:592
22558996658,4cyclictest33-21ksoftirqd/223:20:182
22558996457,4cyclictest33-21ksoftirqd/220:10:142
22558996456,4cyclictest33-21ksoftirqd/219:45:182
22558996355,5cyclictest33-21ksoftirqd/223:00:152
220782622,48sleep10-21swapper/119:07:311
129991620,1ptp4l401ktimersoftd/321:08:363
129991620,1ptp4l401ktimersoftd/321:08:353
22558996155,4cyclictest33-21ksoftirqd/221:40:132
22558996153,4cyclictest33-21ksoftirqd/220:00:152
136672610,9sleep02255699cyclictest21:05:330
136672610,9sleep02255699cyclictest21:05:320
22558996054,4cyclictest33-21ksoftirqd/220:15:182
22558995952,4cyclictest33-21ksoftirqd/219:40:152
22558995952,4cyclictest33-21ksoftirqd/219:35:152
22558995952,4cyclictest33-21ksoftirqd/219:35:142
22558995852,4cyclictest33-21ksoftirqd/221:20:172
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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