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2026-04-26 - 19:10

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 Sun Apr 26, 2026 12:46:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
310572660,0sleep20-21swapper/209:00:182
111391660,14ptp4l9-21ksoftirqd/007:05:210
111391630,29ptp4l0-21swapper/107:09:291
1881916049,6phc2sys0-21swapper/207:07:182
111391600,5ptp4l0-21swapper/407:09:144
228302580,0sleep50-21swapper/510:19:525
140352570,0sleep00-21swapper/010:50:140
111391550,5ptp4l0-21swapper/507:05:215
1881915433,6phc2sys0-21swapper/607:08:296
876925331,7sleep70-21swapper/707:05:147
1036624736,7sleep30-21swapper/307:08:543
289672440,0sleep60-21swapper/611:51:496
111391350,0ptp4l0-21swapper/410:51:454
111391340,0ptp4l0-21swapper/010:36:060
111391330,0ptp4l0-21swapper/509:52:085
111391330,0ptp4l0-21swapper/411:25:434
111391330,0ptp4l0-21swapper/010:10:500
111391330,0ptp4l0-21swapper/010:10:490
111391320,3ptp4l0-21swapper/412:30:164
111391320,0ptp4l7473-21ssh09:59:444
111391320,0ptp4l0-21swapper/711:17:567
111391320,0ptp4l0-21swapper/409:48:174
111391320,0ptp4l0-21swapper/012:15:570
111391320,0ptp4l0-21swapper/012:08:160
111391310,0ptp4l0-21swapper/710:20:177
111391310,0ptp4l0-21swapper/512:31:315
111391310,0ptp4l0-21swapper/412:37:104
111391310,0ptp4l0-21swapper/411:52:204
111391310,0ptp4l0-21swapper/411:22:124
111391310,0ptp4l0-21swapper/409:30:154
111391310,0ptp4l0-21swapper/409:24:314
111391310,0ptp4l0-21swapper/407:55:124
111391310,0ptp4l0-21swapper/012:04:250
111391310,0ptp4l0-21swapper/011:54:350
111391310,0ptp4l0-21swapper/011:20:230
111391310,0ptp4l0-21swapper/010:31:370
111391310,0ptp4l0-21swapper/010:21:060
111391310,0ptp4l0-21swapper/009:24:520
111391300,2ptp4l0-21swapper/410:31:564
111391300,0ptp4l0-21swapper/611:49:336
111391300,0ptp4l0-21swapper/411:42:274
111391300,0ptp4l0-21swapper/410:20:104
111391300,0ptp4l0-21swapper/410:10:074
111391300,0ptp4l0-21swapper/410:10:064
111391300,0ptp4l0-21swapper/012:38:250
111391300,0ptp4l0-21swapper/010:41:370
111391290,3ptp4l0-21swapper/409:44:044
111391290,3ptp4l0-21swapper/012:34:090
111391290,0ptp4l0-21swapper/411:59:154
111391290,0ptp4l0-21swapper/411:39:514
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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