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2023-02-07 - 18:29

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 Tue Feb 07, 2023 12:43:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3611290,0irq_work/3381rcuc/309:52:423
3611290,0irq_work/3381rcuc/309:52:423
3611270,0irq_work/3381rcuc/312:12:563
3611220,0irq_work/3381rcuc/307:11:153
3611200,0irq_work/3381rcuc/307:32:523
3611200,0irq_work/3381rcuc/307:32:523
3611140,0irq_work/3381rcuc/309:57:553
3611040,0irq_work/3381rcuc/308:32:513
3611010,0irq_work/3381rcuc/308:17:473
3611000,0irq_work/3381rcuc/307:58:253
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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