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2023-03-21 - 17:43

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #3

Rack #0/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #1/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #2/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #3/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #4/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #5/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #6/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #7/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #8/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #9/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #a/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #b/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #c/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #d/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #e/#0 #1 #2 #3 #4 #5 #6 #7 #8 
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x86 Intel Atom E3940 @1600 MHz, Linux 4.16.15-rt7 (Profile)

Latency plot of shadow in rack #5, 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 -Sp99 -i200 -h400 -q
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rack5slot3s.osadl.org (updated Tue Mar 21, 2023 12:44:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
140902242165,24sleep10-21swapper/107:06:501
141622239163,24sleep00-21swapper/007:07:450
143132238162,24sleep30-21swapper/307:09:423
142612237163,24sleep20-21swapper/207:09:002
144449910399,3cyclictest0-21swapper/210:56:362
98982800,4sleep230-21rcuc/210:35:362
134812740,1sleep20-21swapper/210:45:192
36952500,1sleep03696-21expr09:10:200
14444994845,2cyclictest0-21swapper/209:52:032
1445099441,32cyclictest25135-21timerandwakeup11:10:283
1445099402,32cyclictest14959-40dnf10:50:123
1445099382,7cyclictest32557-40dnf07:48:463
1445099381,28cyclictest2475-21sshd07:54:443
1443899381,34cyclictest32557-40dnf07:48:451
1443299389,13cyclictest26707-21idleruntime-cro08:50:010
191672370,9sleep339-21rcuc/312:10:353
1445099371,3cyclictest0-21swapper/309:40:303
1445099371,28cyclictest0-21swapper/312:34:083
1445099371,17cyclictest18744-21head10:55:303
1443899371,9cyclictest28586-21ntp_kernel_pll_10:05:281
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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