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2022-07-01 - 00:04

x86 Intel Atom D2700 @2130 MHz, Linux 5.15.49-rt47 (Profile)

Latency plot of system in rack #1, slot #6
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 -Sp99 -i200 -h400 -q
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 10 highest latencies:
System rack1slot6.osadl.org (updated Thu Jun 30, 2022 12:43:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3611490,0irq_work/3381rcuc/310:10:183
3611420,0irq_work/3381rcuc/309:15:103
1811310,0irq_work/0161rcuc/010:20:020
3611300,0irq_work/3381rcuc/311:55:233
3611190,0irq_work/3381rcuc/310:30:283
3611190,0irq_work/3381rcuc/307:25:303
3611160,0irq_work/3381rcuc/308:05:293
1811160,0irq_work/0161rcuc/010:09:590
3611120,0irq_work/3381rcuc/311:05:143
3611100,0irq_work/3381rcuc/312:06:163
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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