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2026-09-02 - 19:51

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, slot #8

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 rackcslot8s.osadl.org (updated Wed Sep 02, 2026 12:46:10)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
211932820,0sleep10-21swapper/111:50:201
256522670,2sleep41527099cyclictest10:22:444
111391630,32ptp4l0-21swapper/107:06:571
1485826252,6sleep40-21swapper/407:08:374
111391600,29ptp4l0-21swapper/207:09:312
197562590,0sleep40-21swapper/411:00:174
1475425836,7sleep60-21swapper/607:07:186
1466125837,6sleep50-21swapper/507:06:055
1460825836,7sleep70-21swapper/707:05:287
36832570,0sleep70-21swapper/710:37:457
111391520,5ptp4l0-21swapper/007:05:130
1486624635,7sleep30-21swapper/307:08:433
111391390,0ptp4l6175-21latency_hist11:30:001
111391350,1ptp4l30079-21sed08:50:154
111391350,0ptp4l0-21swapper/509:30:145
111391350,0ptp4l0-21swapper/410:10:184
111391340,0ptp4l0-21swapper/412:20:184
111391340,0ptp4l0-21swapper/412:01:334
111391330,0ptp4l0-21swapper/412:30:154
111391330,0ptp4l0-21swapper/411:33:004
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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