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2025-09-03 - 21:09

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #8, 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 rack8slot4s.osadl.org (updated Wed Sep 03, 2025 12:44:46)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
31899452253181,25sleep10-21swapper/107:08:381
31899812247176,24sleep50-21swapper/507:09:055
31898892247171,21sleep20-21swapper/207:07:502
31899052214177,24sleep00-21swapper/007:08:040
31898522211177,22sleep30-21swapper/307:07:193
31897612211174,24sleep40-21swapper/407:05:594
31899652208174,21sleep70-21swapper/707:08:517
31876042208175,21sleep60-21swapper/607:05:126
32095802430,0sleep30-21swapper/307:40:183
319027599320,27cyclictest0-21swapper/109:39:591
319028699270,1cyclictest3190580-21apt-get07:10:115
319028699260,21cyclictest0-21swapper/511:45:115
319028099260,25cyclictest0-21swapper/307:55:123
319029099250,3cyclictest3225214-21perf08:10:016
319029099250,24cyclictest3248807-21apt-get08:50:126
3190280992523,1cyclictest0-21swapper/307:35:013
3190280992523,1cyclictest0-21swapper/307:35:003
319028099250,24cyclictest0-21swapper/311:25:133
319027599251,23cyclictest3306332-21cron10:29:591
319028699240,23cyclictest0-21swapper/507:20:115
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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