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2026-05-20 - 20:13

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 50 highest latencies:
System rackcslot8s.osadl.org (updated Wed May 20, 2026 12:46:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1954726636,6sleep70-21swapper/707:06:227
111391630,5ptp4l0-21swapper/507:07:505
111391620,5ptp4l0-21swapper/107:07:191
111391610,5ptp4l0-21swapper/407:09:024
111391610,29ptp4l0-21swapper/007:08:530
1977525343,6sleep20-21swapper/207:09:152
52342520,0sleep10-21swapper/108:55:171
1963825038,7sleep60-21swapper/607:07:346
1959724837,7sleep30-21swapper/307:06:583
111391350,0ptp4l0-21swapper/109:55:101
111391320,0ptp4l0-21swapper/411:20:164
111391320,0ptp4l0-21swapper/012:07:450
111391310,0ptp4l0-21swapper/009:27:080
111391300,0ptp4l0-21swapper/410:05:124
111391300,0ptp4l0-21swapper/409:32:344
111391300,0ptp4l0-21swapper/010:05:160
111391300,0ptp4l0-21swapper/009:10:180
111391290,0ptp4l0-21swapper/411:37:284
111391290,0ptp4l0-21swapper/409:19:384
111391290,0ptp4l0-21swapper/110:22:021
111391290,0ptp4l0-21swapper/011:20:090
111391290,0ptp4l0-21swapper/010:56:500
111391280,3ptp4l0-21swapper/109:45:551
111391280,2ptp4l0-21swapper/411:47:424
111391280,2ptp4l0-21swapper/409:26:164
111391280,1ptp4l32398-21ssh12:30:094
111391280,0ptp4l0-21swapper/411:00:024
111391280,0ptp4l0-21swapper/410:51:034
111391280,0ptp4l0-21swapper/410:10:124
111391280,0ptp4l0-21swapper/408:55:174
111391280,0ptp4l0-21swapper/408:30:114
111391280,0ptp4l0-21swapper/109:00:221
111391280,0ptp4l0-21swapper/012:20:160
111391280,0ptp4l0-21swapper/011:58:410
111391280,0ptp4l0-21swapper/011:25:030
111391280,0ptp4l0-21swapper/011:15:020
111391280,0ptp4l0-21swapper/011:15:010
111391280,0ptp4l0-21swapper/010:44:230
111391280,0ptp4l0-21swapper/010:30:350
111391280,0ptp4l0-21swapper/007:50:160
111391270,0ptp4l10867-21diskmemload12:04:274
111391270,0ptp4l0-21swapper/709:25:127
111391270,0ptp4l0-21swapper/412:15:554
111391270,0ptp4l0-21swapper/411:32:044
111391270,0ptp4l0-21swapper/411:26:024
111391270,0ptp4l0-21swapper/410:47:544
111391270,0ptp4l0-21swapper/410:41:504
111391270,0ptp4l0-21swapper/410:15:484
111391270,0ptp4l0-21swapper/409:53:454
111391270,0ptp4l0-21swapper/409:44:424
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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