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2026-04-16 - 14:33

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #1

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.

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 rack4slot1s.osadl.org (updated Thu Apr 16, 2026 12:44:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
952721160,2sleep30-21swapper/309:07:193
952721160,2sleep30-21swapper/309:07:193
380921130,4sleep30-21swapper/311:47:063
380921130,4sleep30-21swapper/311:47:063
1020921130,2chrt0-21swapper/010:37:130
1020921130,2chrt0-21swapper/010:37:130
1020921130,2chrt0-21swapper/010:37:130
382721020,2chrt3822-21strings08:52:170
382721020,2chrt3822-21strings08:52:170
167132830,2sleep20-21swapper/210:52:222
54122750,2sleep20-21swapper/207:31:592
133192740,3chrt0-21swapper/112:12:091
133192740,3chrt0-21swapper/112:12:091
163322710,2sleep00-21swapper/009:27:110
163322710,2sleep00-21swapper/009:27:110
10052700,6sleep030920-21cyclictest10:12:120
10052700,6sleep030920-21cyclictest10:12:120
59912680,2sleep30-21swapper/307:32:123
134972670,3sleep30-21swapper/312:12:113
134972670,3sleep30-21swapper/312:12:113
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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