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2023-02-06 - 14:10

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

Latency plot of system in rack #d, slot #1
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 rackdslot1.osadl.org (updated Mon Feb 06, 2023 00:46:16)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
198822090,9sleep00-21swapper/019:05:150
1176911680,7ptp4l0-21swapper/319:05:273
1132421660,7sleep3417899cyclictest21:40:253
1176911450,16ptp4l0-21swapper/119:05:481
1176911180,9ptp4l0-21swapper/219:05:312
117691860,5ptp4l1142-21runrttasks20:15:151
23862770,26sleep233-21ksoftirqd/220:15:012
129152700,2sleep20-21swapper/219:25:312
117691700,28ptp4l28987-21latency00:35:252
117691640,2ptp4l0-21swapper/220:40:122
117691640,2ptp4l0-21swapper/220:40:112
117691610,4ptp4l19118-21hddtemp_smartct19:40:251
117691610,1ptp4l0-21swapper/122:45:281
217202590,2sleep20-21swapper/219:45:222
117691590,2ptp4l0-21swapper/022:30:160
117691580,5ptp4l216-21systemd-journal20:25:521
117691570,3ptp4l11735-21ls22:50:232
117691570,2ptp4l0-21swapper/120:45:391
117691570,2ptp4l0-21swapper/120:45:391
417899564,8cyclictest41-21ksoftirqd/322:45:233
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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