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2025-10-19 - 05:38

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 here to display the system's profile data or here to proceed to next system.
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 Sun Oct 19, 2025 00:46:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
206882610,0sleep00-21swapper/021:55:130
114091600,5ptp4l0-21swapper/519:06:255
114091600,29ptp4l0-21swapper/119:05:301
2742225949,6sleep30-21swapper/319:05:353
2120915936,7phc2sys0-21swapper/019:05:310
114091590,6ptp4l0-21swapper/619:08:266
114091590,28ptp4l0-21swapper/219:06:452
17172570,0sleep30-21swapper/321:30:003
2754625139,7sleep70-21swapper/719:07:167
114091500,31ptp4l0-21swapper/419:05:134
114091310,0ptp4l0-21swapper/022:50:130
114091300,0ptp4l0-21swapper/522:06:205
114091300,0ptp4l0-21swapper/521:05:195
114091300,0ptp4l0-21swapper/422:44:424
114091300,0ptp4l0-21swapper/122:58:251
114091300,0ptp4l0-21swapper/122:58:251
114091290,0ptp4l0-21swapper/422:47:464
114091290,0ptp4l0-21swapper/100:33:061
114091290,0ptp4l0-21swapper/100:05:141
114091290,0ptp4l0-21swapper/023:46:030
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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