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2024-04-23 - 08:38

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, 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 rack7slot4s.osadl.org (updated Tue Apr 23, 2024 00:45:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2093599495,32cyclictest26866irq/58-eth023:40:113
2093599481,13cyclictest26866irq/58-eth022:30:223
2093599383,25cyclictest26866irq/58-eth000:10:123
2093599383,23cyclictest26866irq/58-eth021:05:143
2093599376,22cyclictest26866irq/58-eth000:15:113
2093599376,22cyclictest26866irq/58-eth000:15:103
2092999376,9cyclictest27-21ksoftirqd/221:10:132
2093599362,24cyclictest26866irq/58-eth000:05:143
2093599343,14cyclictest0-21swapper/321:14:463
20929993312,11cyclictest0-21swapper/221:10:022
2092299338,4cyclictest21-21ksoftirqd/122:30:231
20911993313,4cyclictest12-21ksoftirqd/023:35:130
2093599302,13cyclictest26866irq/58-eth022:50:093
2093599291,14cyclictest26866irq/58-eth021:20:113
2092299292,16cyclictest28799-21ssh22:40:111
2093599286,13cyclictest26866irq/58-eth022:40:103
2093599284,12cyclictest26866irq/58-eth022:45:143
2093599283,18cyclictest0-21swapper/321:29:463
2093599283,13cyclictest26866irq/58-eth022:10:123
2092999281,10cyclictest1656166ssh22:50:202
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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