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2024-05-20 - 18:32

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, 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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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 rackcslot3s.osadl.org (updated Mon May 20, 2024 12:50:24)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
197432525484,16sleep00-21swapper/007:09:510
197432525484,16sleep00-21swapper/007:09:500
195152476451,19sleep30-21swapper/307:06:333
195152476451,19sleep30-21swapper/307:06:333
196442472450,15sleep20-21swapper/207:08:242
196442472450,15sleep20-21swapper/207:08:242
196472464439,19sleep50-21swapper/507:08:265
196472464439,19sleep50-21swapper/507:08:265
177792453433,14sleep60-21swapper/607:05:166
177792453433,14sleep60-21swapper/607:05:166
177432447426,15sleep10-21swapper/107:05:031
177432447426,15sleep10-21swapper/107:05:021
194912432412,14sleep70-21swapper/707:06:137
194912432412,14sleep70-21swapper/707:06:137
196642404383,15sleep40-21swapper/407:08:424
196642404383,15sleep40-21swapper/407:08:424
318802980,0sleep00-21swapper/007:30:400
121392810,1sleep42019599cyclictest11:20:164
254812610,0sleep20-21swapper/207:20:012
254812610,0sleep20-21swapper/207:20:002
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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