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2024-04-25 - 06:40

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #b, slot #4

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 - Rack #f/#0 #1 #2 #3 #4 #5 #6 #7 #8 
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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

Data to construct the above plot have been generated using the RT test utility cyclictest.
Unexpectedly long latencies may be caused by SMIs
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 rackbslot4s.osadl.org (updated Mon Sep 30, 2019 00:45:40)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
683999584057584046,9cyclictest950ksoftirqd/023:23:400
68429953265316,8cyclictest24511-21kworker/3:223:24:093
68399952375218,17cyclictest16459-21kworker/0:122:51:090
2959421850,5sleep0683999cyclictest23:15:070
973621520,4sleep0683999cyclictest20:25:030
6659211268,16sleep30-21swapper/319:09:363
6667211066,16sleep10-21swapper/119:09:421
6663210867,16sleep20-21swapper/219:09:382
638029571,16sleep00-21swapper/019:06:070
1721989880,1phc2sys0-21swapper/100:35:291
1721690710,1ptp4l21-21ksoftirqd/123:20:141
177102700,1sleep00-21swapper/020:40:120
1721989690,1phc2sys0-21swapper/123:01:391
1721989660,1phc2sys0-21swapper/123:58:581
1721989650,1phc2sys0-21swapper/123:19:561
1721989640,1phc2sys0-21swapper/100:16:251
1721989640,1phc2sys0-21swapper/100:16:251
1721989630,2phc2sys684099cyclictest23:09:371
37002600,1sleep10-21swapper/123:30:011
1721989600,3phc2sys684099cyclictest23:53:241
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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