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2026-04-18 - 08:53

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 Sat Apr 18, 2026 00:46:11)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
111391630,30ptp4l0-21swapper/119:07:211
291626240,7sleep70-21swapper/719:07:247
193902610,0sleep60-21swapper/621:45:016
111391610,29ptp4l0-21swapper/019:06:130
111391590,5ptp4l0-21swapper/419:07:044
281625747,6sleep20-21swapper/219:06:062
111391520,5ptp4l0-21swapper/519:05:445
311425039,7sleep60-21swapper/619:09:556
288224635,7sleep30-21swapper/319:06:553
111391340,1ptp4l22974-21latency21:00:164
111391330,0ptp4l0-21swapper/419:45:114
111391330,0ptp4l0-21swapper/100:29:061
111391320,3ptp4l0-21swapper/019:40:010
111391320,1ptp4l9376-21smart_sda23:00:190
111391320,0ptp4l0-21swapper/423:29:234
111391320,0ptp4l0-21swapper/023:35:140
111391310,0ptp4l0-21swapper/419:50:194
111391310,0ptp4l0-21swapper/123:36:281
111391310,0ptp4l0-21swapper/021:27:310
111391300,0ptp4l0-21swapper/523:43:365
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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