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2025-09-03 - 21:10

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 03, 2025 12:46:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2120916746,6phc2sys0-21swapper/707:05:317
114091670,28ptp4l0-21swapper/207:05:172
423726252,6sleep30-21swapper/307:09:493
114091620,29ptp4l0-21swapper/107:07:011
214982590,0sleep61093-21runrttasks09:44:106
114091570,15ptp4l0-21swapper/507:09:255
419625533,7sleep00-21swapper/007:09:140
410325433,6sleep60-21swapper/607:08:086
392025431,7sleep40-21swapper/407:05:494
114091330,1ptp4l11055-21ssh10:55:191
114091320,0ptp4l0-21swapper/510:50:105
114091310,0ptp4l0-21swapper/510:09:395
114091310,0ptp4l0-21swapper/509:10:525
114091300,0ptp4l0-21swapper/611:03:546
114091300,0ptp4l0-21swapper/512:20:175
114091300,0ptp4l0-21swapper/210:12:172
114091300,0ptp4l0-21swapper/107:35:091
114091300,0ptp4l0-21swapper/009:40:150
114091290,0ptp4l0-21swapper/609:03:326
114091290,0ptp4l0-21swapper/411:18:354
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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