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2023-06-05 - 02:26

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 20 highest latencies:
System rackdslot3.osadl.org (updated Sun Jun 04, 2023 12:45:56)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
664221440,8sleep12912199cyclictest10:57:121
1984821210,6sleep22912299cyclictest10:15:342
218402990,8sleep02912099cyclictest09:10:380
29121998873,8cyclictest25-21ksoftirqd/112:20:171
181212880,4sleep31123-21snmpd12:30:423
29121998772,8cyclictest25-21ksoftirqd/108:05:161
825591750,4ptp4l401ktimersoftd/307:05:023
825591740,2ptp4l391rcuc/308:46:473
57698730,59rtkit-daemon11511-21apache207:07:131
825591720,2ptp4l391rcuc/310:01:563
825591710,1ptp4l401ktimersoftd/312:17:193
29121997057,7cyclictest25-21ksoftirqd/107:20:171
324032660,2sleep20-21swapper/209:35:182
58702630,3sleep05873-21needreboot10:55:350
29121996347,8cyclictest25-21ksoftirqd/110:00:171
29120996324,9cyclictest9-21ksoftirqd/007:12:430
85142610,5sleep21131-21lldpd11:00:352
29121996147,7cyclictest25-21ksoftirqd/110:20:181
29121996047,7cyclictest25-21ksoftirqd/108:00:221
29121996044,8cyclictest25-21ksoftirqd/111:35:181
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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