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2022-10-04 - 08:39

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 Tue Oct 04, 2022 00:43:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3611540,0irq_work/3381rcuc/300:17:133
3611540,0irq_work/3381rcuc/300:17:133
3611410,0irq_work/3381rcuc/322:37:093
3611300,0irq_work/3381rcuc/321:11:543
3611200,0irq_work/3381rcuc/321:42:093
3611190,0irq_work/3381rcuc/320:41:583
3611160,0irq_work/3381rcuc/320:32:373
3611140,0irq_work/3381rcuc/323:52:093
3611120,0irq_work/3381rcuc/322:32:183
3611090,0irq_work/3381rcuc/323:22:083
3611040,0irq_work/3381rcuc/323:16:383
3611040,0irq_work/3381rcuc/323:16:383
3611030,0irq_work/3381rcuc/321:47:073
3611020,0irq_work/3381rcuc/320:16:383
3611010,0irq_work/3381rcuc/320:17:103
3611010,0irq_work/3381rcuc/300:01:383
3611000,0irq_work/3381rcuc/320:22:043
361990,0irq_work/3381rcuc/320:02:123
361960,0irq_work/3381rcuc/300:12:003
291960,0irq_work/2311rcuc/200:31:542
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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