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2026-10-29 - 19:41

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 Thu Oct 29, 2026 12:46:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
111391660,32ptp4l0-21swapper/107:08:231
111391640,29ptp4l0-21swapper/007:05:180
111391610,5ptp4l0-21swapper/507:08:475
111391610,5ptp4l0-21swapper/407:05:014
302225949,6sleep20-21swapper/207:07:382
15242570,0sleep70-21swapper/712:16:547
292825443,7sleep70-21swapper/707:06:317
300924737,6sleep60-21swapper/607:07:356
287724635,7sleep30-21swapper/307:05:473
139242360,0sleep70-21swapper/711:50:107
111391350,0ptp4l0-21swapper/011:16:390
111391330,0ptp4l0-21swapper/012:05:040
111391330,0ptp4l0-21swapper/009:36:530
111391320,0ptp4l0-21swapper/708:25:137
111391320,0ptp4l0-21swapper/012:29:510
111391320,0ptp4l0-21swapper/011:29:570
111391320,0ptp4l0-21swapper/009:31:370
111391310,0ptp4l0-21swapper/011:44:390
111391300,4ptp4l0-21swapper/510:55:145
111391300,0ptp4l0-21swapper/011:06:410
111391300,0ptp4l0-21swapper/010:58:110
111391300,0ptp4l0-21swapper/010:22:310
111391300,0ptp4l0-21swapper/010:05:130
111391300,0ptp4l0-21swapper/010:01:320
111391290,0ptp4l0-21swapper/112:01:071
111391290,0ptp4l0-21swapper/112:01:071
111391290,0ptp4l0-21swapper/110:55:091
111391290,0ptp4l0-21swapper/011:37:440
111391290,0ptp4l0-21swapper/009:44:490
111391280,0ptp4l0-21swapper/610:01:186
111391280,0ptp4l0-21swapper/410:52:594
111391280,0ptp4l0-21swapper/012:21:270
111391280,0ptp4l0-21swapper/012:02:020
111391280,0ptp4l0-21swapper/012:02:020
111391280,0ptp4l0-21swapper/011:51:470
111391280,0ptp4l0-21swapper/011:04:340
111391280,0ptp4l0-21swapper/010:26:330
111391270,0ptp4l0-21swapper/612:32:026
111391270,0ptp4l0-21swapper/412:32:214
111391270,0ptp4l0-21swapper/409:45:154
111391270,0ptp4l0-21swapper/012:32:300
111391270,0ptp4l0-21swapper/011:24:390
111391270,0ptp4l0-21swapper/009:59:590
111391270,0ptp4l0-21swapper/009:45:050
111391270,0ptp4l0-21swapper/009:15:360
111391260,0ptp4l26579-21diskmemload10:41:156
111391260,0ptp4l0-21swapper/612:39:426
111391260,0ptp4l0-21swapper/609:12:086
111391260,0ptp4l0-21swapper/412:10:154
111391260,0ptp4l0-21swapper/411:45:184
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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