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2026-04-07 - 08:22

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 Tue Apr 07, 2026 00:46:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
111391630,6ptp4l0-21swapper/019:05:290
320522620,0sleep10-21swapper/121:55:171
702626151,6sleep20-21swapper/219:05:552
213912610,0sleep50-21swapper/519:35:205
111391610,30ptp4l0-21swapper/119:08:071
111391580,5ptp4l0-21swapper/419:07:284
717125534,6sleep60-21swapper/619:07:426
111391550,5ptp4l0-21swapper/519:09:495
544225039,7sleep70-21swapper/719:05:117
543824735,7sleep30-21swapper/319:05:073
111391350,0ptp4l0-21swapper/420:55:104
111391340,0ptp4l0-21swapper/000:05:000
111391320,0ptp4l0-21swapper/423:53:444
111391320,0ptp4l0-21swapper/422:35:124
111391310,5ptp4l0-21swapper/423:03:284
111391310,3ptp4l0-21swapper/423:55:094
111391300,0ptp4l0-21swapper/421:23:344
111391300,0ptp4l0-21swapper/421:15:204
111391300,0ptp4l0-21swapper/223:46:582
111391300,0ptp4l0-21swapper/023:57:210
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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