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2024-04-27 - 01:24

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 Fri Apr 26, 2024 12:44:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2500823050,6sleep230-21rcuc/207:05:132
265132242165,25sleep10-21swapper/107:08:111
265732219144,24sleep30-21swapper/307:08:573
264682204165,25sleep00-21swapper/007:07:380
1803721700,4sleep02674999cyclictest11:45:160
1157721680,4sleep02674999cyclictest10:15:280
26759999490,3cyclictest0-21swapper/211:50:542
26759998480,3cyclictest0-21swapper/210:20:502
26759996864,3cyclictest0-21swapper/210:12:032
283182470,1sleep3401ktimersoftd/310:55:123
2676699420,26cyclictest0-21swapper/310:10:013
26766994025,8cyclictest0-21swapper/311:47:403
26766994017,8cyclictest0-21swapper/309:00:473
2676699401,29cyclictest0-21swapper/311:57:563
2676699381,15cyclictest0-21swapper/310:52:353
2676699372,12cyclictest0-21swapper/309:57:213
2674999378,13cyclictest4736-21awk12:30:010
26766993618,3cyclictest0-21swapper/307:18:163
2676699360,13cyclictest0-21swapper/308:50:013
26749993611,12cyclictest1269-21munin-run09:55:020
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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