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2022-10-04 - 02:47

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 Oct 03, 2022 12:46:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1176911780,8ptp4l0-21swapper/007:07:130
1176911680,8ptp4l0-21swapper/107:05:181
2780421640,7sleep2534099cyclictest12:30:292
1176911490,13ptp4l0-21swapper/207:05:412
1176911300,51ptp4l0-21swapper/307:06:043
117691860,2ptp4l0-21swapper/107:30:361
117691700,3ptp4l1159-21snmpd11:48:540
117691670,2ptp4l0-21swapper/007:15:380
117691660,2ptp4l0-21swapper/010:05:200
117691640,4ptp4l22387-21acpi08:55:133
5338996355,4cyclictest9-21ksoftirqd/010:00:160
117691630,20ptp4l26494-21ntp_states10:10:301
117691600,2ptp4l0-21swapper/212:26:422
117691580,2ptp4l0-21swapper/012:12:550
245462570,3sleep10-21swapper/109:00:001
117691570,2ptp4l0-21swapper/209:14:352
117691570,2ptp4l0-21swapper/207:44:282
117691570,2ptp4l0-21swapper/008:50:160
117691570,1ptp4l0-21swapper/112:30:311
117691570,10ptp4l0-21swapper/308:00:283
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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