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2024-07-16 - 15:22

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #9, 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 rack9slot4s (updated Tue Jul 16, 2024 12:59:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
152179912811,1261cyclictest12310-21smartctl10:05:250
152189912251179,28cyclictest27078-21mandb07:52:151
152189911711161,7cyclictest0-21swapper/109:20:321
152189911701149,17cyclictest16201-21ntp_states07:25:351
152189911401125,12cyclictest0-21swapper/109:45:381
146512753705,31sleep10-21swapper/107:21:321
148532482427,39sleep00-21swapper/007:21:460
1521799243212,17cyclictest0-21swapper/009:20:310
1521799235216,15cyclictest0-21swapper/007:25:350
1521899208199,6cyclictest0-21swapper/110:05:251
1521799187178,6cyclictest0-21swapper/009:45:380
1521899702,8cyclictest23002-21users07:40:441
1521899662,8cyclictest3676-21users09:40:401
15218996510,36cyclictest28932-21runrttasks07:56:381
15218996411,33cyclictest12036-21cat08:40:011
1521899641,11cyclictest0-21swapper/109:10:351
15218996410,27cyclictest0-21swapper/108:05:121
15218996410,27cyclictest0-21swapper/108:05:111
1521899632,47cyclictest22873-21chrt10:34:361
1521899631,8cyclictest0-21swapper/111:35:321
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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