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2026-04-24 - 19:06

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 50 highest latencies:
System rackcslot8s.osadl.org (updated Fri Apr 24, 2026 12:46:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
111391620,5ptp4l0-21swapper/107:07:511
3052026050,6sleep70-21swapper/707:05:497
111391600,5ptp4l0-21swapper/407:05:444
3051525737,6sleep20-21swapper/207:05:452
236122560,0sleep30-21swapper/311:20:013
236122560,0sleep30-21swapper/311:20:013
212682550,1sleep421270-21timerandwakeup09:05:204
3050225433,16sleep60-21swapper/607:05:416
3047925432,6sleep50-21swapper/507:05:235
111391530,5ptp4l0-21swapper/007:05:240
3051624837,7sleep30-21swapper/307:05:463
111391340,0ptp4l0-21swapper/411:30:134
111391340,0ptp4l0-21swapper/109:11:351
111391330,0ptp4l17960-21vmstat11:10:200
111391330,0ptp4l17960-21vmstat11:10:190
111391330,0ptp4l0-21swapper/411:54:114
111391330,0ptp4l0-21swapper/411:16:084
111391330,0ptp4l0-21swapper/411:16:074
111391330,0ptp4l0-21swapper/410:45:184
111391330,0ptp4l0-21swapper/211:55:142
111391330,0ptp4l0-21swapper/011:35:170
111391330,0ptp4l0-21swapper/010:29:100
111391320,0ptp4l0-21swapper/412:20:064
111391320,0ptp4l0-21swapper/411:47:224
111391320,0ptp4l0-21swapper/410:59:494
111391310,0ptp4l0-21swapper/412:35:124
111391310,0ptp4l0-21swapper/411:56:234
111391310,0ptp4l0-21swapper/410:53:224
111391310,0ptp4l0-21swapper/410:18:284
111391310,0ptp4l0-21swapper/112:19:031
111391310,0ptp4l0-21swapper/112:12:271
111391310,0ptp4l0-21swapper/109:51:361
111391310,0ptp4l0-21swapper/107:15:121
111391310,0ptp4l0-21swapper/010:16:480
111391310,0ptp4l0-21swapper/010:09:420
111391310,0ptp4l0-21swapper/009:50:190
111391310,0ptp4l0-21swapper/008:45:190
111391300,0ptp4l0-21swapper/412:09:404
111391300,0ptp4l0-21swapper/411:26:054
111391300,0ptp4l0-21swapper/411:01:094
111391300,0ptp4l0-21swapper/409:10:144
111391300,0ptp4l0-21swapper/111:35:421
111391290,3ptp4l0-21swapper/110:13:461
111391290,0ptp4l0-21swapper/412:12:104
111391290,0ptp4l0-21swapper/411:14:164
111391290,0ptp4l0-21swapper/411:14:164
111391290,0ptp4l0-21swapper/411:08:474
111391290,0ptp4l0-21swapper/410:34:544
111391290,0ptp4l0-21swapper/410:00:324
111391290,0ptp4l0-21swapper/409:31:124
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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