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2025-07-03 - 08:34

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 Jul 03, 2025 00:46:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
258382700,0sleep00-21swapper/021:56:510
114091700,39ptp4l0-21swapper/219:08:272
3258926150,7sleep70-21swapper/719:07:337
114091610,5ptp4l0-21swapper/019:09:350
325682590,0sleep40-21swapper/421:22:104
114091590,5ptp4l0-21swapper/519:06:065
114091580,5ptp4l0-21swapper/619:08:496
3274125736,7sleep30-21swapper/319:09:303
114091560,5ptp4l0-21swapper/119:07:141
267472530,0sleep70-21swapper/720:05:247
3257724937,7sleep40-21swapper/419:07:224
114091360,1ptp4l9395-21processes19:25:185
114091340,1ptp4l32202-21basename00:20:142
114091340,0ptp4l0-21swapper/122:35:221
114091320,0ptp4l0-21swapper/522:09:175
114091320,0ptp4l0-21swapper/521:20:015
114091320,0ptp4l0-21swapper/222:50:142
114091310,0ptp4l0-21swapper/523:04:025
114091310,0ptp4l0-21swapper/522:00:155
114091310,0ptp4l0-21swapper/500:35:035
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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