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2023-02-06 - 13:37

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 20 highest latencies:
System rack1slot6.osadl.org (updated Mon Feb 06, 2023 00:43:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3611350,0irq_work/3381rcuc/322:52:043
3611090,0irq_work/3381rcuc/322:39:333
3611090,0irq_work/3381rcuc/322:39:333
3611080,0irq_work/3381rcuc/319:52:573
361950,0irq_work/3381rcuc/322:32:513
291940,0irq_work/2311rcuc/222:06:442
361860,0irq_work/3381rcuc/323:42:483
291860,0irq_work/2311rcuc/222:57:572
361840,0irq_work/3381rcuc/319:22:443
361840,0irq_work/3381rcuc/319:22:443
361830,0irq_work/3381rcuc/321:07:423
361820,0irq_work/3381rcuc/323:52:513
291790,0irq_work/2311rcuc/221:12:482
361780,0irq_work/3381rcuc/322:22:243
361780,0irq_work/3381rcuc/321:14:483
291780,0irq_work/2311rcuc/220:17:012
361770,0irq_work/3381rcuc/323:22:293
361770,0irq_work/3381rcuc/322:30:483
181760,0irq_work/0161rcuc/021:07:490
361740,0irq_work/3381rcuc/323:24:373
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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