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2023-06-09 - 09:59

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

Latency plot of system in rack #d, 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 --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 10 highest latencies:
System rackdslot3.osadl.org (updated Fri Jun 09, 2023 00:45:59)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
495021730,9sleep02194999cyclictest20:50:290
825591880,3ptp4l401ktimersoftd/319:07:473
294962790,5sleep11131-21lldpd20:35:161
21949997668,5cyclictest9-21ksoftirqd/000:00:200
21950997456,10cyclictest25-21ksoftirqd/120:20:171
21949997258,9cyclictest9-21ksoftirqd/020:55:220
21949997258,9cyclictest9-21ksoftirqd/020:55:220
825591690,2ptp4l401ktimersoftd/323:41:253
825591690,1ptp4l401ktimersoftd/321:34:063
825591690,1ptp4l401ktimersoftd/320:54:153
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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