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2025-11-06 - 15:23

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 Thu Nov 06, 2025 12:46:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
254562670,0sleep00-21swapper/010:00:120
114091650,28ptp4l0-21swapper/107:05:431
73792640,0sleep60-21swapper/612:26:216
114091630,5ptp4l0-21swapper/007:07:310
2732225848,6sleep70-21swapper/707:08:397
114091580,5ptp4l0-21swapper/407:08:324
295902570,0sleep10-21swapper/112:14:071
290432560,1sleep51093-21runrttasks10:45:595
2722125534,6sleep60-21swapper/607:07:186
2736425443,6sleep20-21swapper/207:09:142
2719225444,6sleep30-21swapper/307:06:593
114091530,4ptp4l0-21swapper/507:05:145
114091330,0ptp4l0-21swapper/409:24:254
114091320,0ptp4l0-21swapper/509:32:055
114091320,0ptp4l0-21swapper/109:05:141
114091310,0ptp4l0-21swapper/507:14:155
114091310,0ptp4l0-21swapper/412:34:464
114091310,0ptp4l0-21swapper/412:01:054
114091310,0ptp4l0-21swapper/109:15:351
114091310,0ptp4l0-21swapper/107:10:231
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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