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2024-07-27 - 08:13

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 - 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 rack5slot3s.osadl.org (updated Sat Jul 27, 2024 00:44:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
228732238164,25sleep20-21swapper/219:06:592
230482237163,24sleep30-21swapper/319:09:133
227982237165,58sleep00-21swapper/019:06:000
230982205167,25sleep10-21swapper/119:09:521
711421630,4sleep12320599cyclictest23:25:131
895821030,4sleep38964-21gltestperf22:15:143
232109910391,3cyclictest0-21swapper/200:08:422
225942610,4sleep12320599cyclictest22:45:231
167972610,2sleep20-21swapper/221:20:102
167972610,2sleep20-21swapper/221:20:102
23210995955,3cyclictest0-21swapper/221:03:272
17952580,4sleep22321099cyclictest00:25:202
161282540,2sleep339-21rcuc/320:05:123
256992530,3sleep339-21rcuc/321:40:143
2320599447,24cyclictest26721-21cut22:55:201
2320599441,10cyclictest6504-21perf23:25:011
2320599421,32cyclictest29078-21users21:45:281
2321599411,29cyclictest0-21swapper/323:40:213
23215994025,10cyclictest0-21swapper/323:53:263
2319999401,15cyclictest18682-21date21:25:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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