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2025-12-19 - 11:31

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, slot #7

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 rackcslot7s.osadl.org (updated Fri Dec 19, 2025 00:44:53)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
36182882810,7sleep14497-21PK-Backend20:10:231
359397427740,9sleep30-21swapper/319:05:073
197399700,58rtkit-daemon0-21swapper/219:05:522
197399690,9rtkit-daemon1972-21rtkit-daemon22:08:213
197399690,4rtkit-daemon0-21swapper/019:47:460
359496026547,10sleep10-21swapper/119:05:291
359419226442,14sleep00-21swapper/019:05:160
197399630,8rtkit-daemon1972-21rtkit-daemon22:52:173
197399620,9rtkit-daemon1972-21rtkit-daemon00:25:233
197399620,8rtkit-daemon1972-21rtkit-daemon19:58:123
197399600,9rtkit-daemon1972-21rtkit-daemon19:22:523
197399590,8rtkit-daemon1972-21rtkit-daemon21:26:233
36938942580,5sleep20-21swapper/223:45:142
197399580,8rtkit-daemon1972-21rtkit-daemon22:59:442
36540112570,21sleep234-21ksoftirqd/221:50:202
197399570,9rtkit-daemon1972-21rtkit-daemon21:11:152
197399550,9rtkit-daemon1972-21rtkit-daemon23:15:372
197399550,9rtkit-daemon1972-21rtkit-daemon21:18:563
197399550,8rtkit-daemon1972-21rtkit-daemon21:21:183
197399520,8rtkit-daemon1972-21rtkit-daemon22:15:332
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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