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2026-04-16 - 22:18

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 100 highest latencies:
System rackcslot8s.osadl.org (updated Thu Apr 16, 2026 12:46:13)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
111391630,5ptp4l0-21swapper/107:06:271
1471926241,6sleep20-21swapper/207:07:142
81522600,1sleep61068-21runrttasks09:10:516
73362560,0sleep10-21swapper/112:12:231
111391540,11ptp4l0-21swapper/507:05:135
202802530,0sleep00-21swapper/007:20:000
202802530,0sleep00-21swapper/007:20:000
1478025343,6sleep70-21swapper/707:07:597
1479124937,7sleep00-21swapper/007:08:070
1478624837,6sleep40-21swapper/407:08:044
1475024736,7sleep30-21swapper/307:07:393
1462324736,6sleep60-21swapper/607:05:576
111391320,0ptp4l0-21swapper/409:30:154
111391310,0ptp4l0-21swapper/011:00:140
111391300,3ptp4l0-21swapper/412:01:274
111391300,0ptp4l0-21swapper/411:48:264
111391300,0ptp4l0-21swapper/407:40:154
111391300,0ptp4l0-21swapper/312:27:333
111391300,0ptp4l0-21swapper/211:27:432
111391300,0ptp4l0-21swapper/110:56:071
111391290,0ptp4l0-21swapper/411:35:124
111391290,0ptp4l0-21swapper/311:18:493
111391290,0ptp4l0-21swapper/109:43:251
111391290,0ptp4l0-21swapper/011:36:370
111391290,0ptp4l0-21swapper/011:05:120
111391290,0ptp4l0-21swapper/009:55:140
111391290,0ptp4l0-21swapper/009:55:140
111391280,0ptp4l0-21swapper/711:06:187
111391280,0ptp4l0-21swapper/610:34:196
111391280,0ptp4l0-21swapper/609:35:506
111391280,0ptp4l0-21swapper/412:05:044
111391280,0ptp4l0-21swapper/411:57:364
111391280,0ptp4l0-21swapper/410:05:204
111391280,0ptp4l0-21swapper/409:53:494
111391280,0ptp4l0-21swapper/210:45:142
111391280,0ptp4l0-21swapper/012:35:220
111391280,0ptp4l0-21swapper/012:35:210
111391280,0ptp4l0-21swapper/012:19:390
111391280,0ptp4l0-21swapper/010:45:180
111391280,0ptp4l0-21swapper/009:49:590
111391280,0ptp4l0-21swapper/009:35:230
111391270,3ptp4l0-21swapper/412:35:384
111391270,3ptp4l0-21swapper/412:35:384
111391270,3ptp4l0-21swapper/011:53:510
111391270,0ptp4l0-21swapper/412:29:424
111391270,0ptp4l0-21swapper/412:19:384
111391270,0ptp4l0-21swapper/411:43:014
111391270,0ptp4l0-21swapper/209:35:512
111391270,0ptp4l0-21swapper/110:44:521
111391270,0ptp4l0-21swapper/012:26:470
111391270,0ptp4l0-21swapper/012:04:410
111391270,0ptp4l0-21swapper/011:55:200
111391270,0ptp4l0-21swapper/011:48:300
111391270,0ptp4l0-21swapper/010:54:020
111391270,0ptp4l0-21swapper/010:20:150
111391260,3ptp4l0-21swapper/407:25:154
111391260,2ptp4l0-21swapper/611:15:296
111391260,0ptp4l0-21swapper/710:30:547
111391260,0ptp4l0-21swapper/612:30:156
111391260,0ptp4l0-21swapper/511:15:405
111391260,0ptp4l0-21swapper/412:24:074
111391260,0ptp4l0-21swapper/411:04:534
111391260,0ptp4l0-21swapper/410:18:194
111391260,0ptp4l0-21swapper/408:30:134
111391260,0ptp4l0-21swapper/407:55:144
111391260,0ptp4l0-21swapper/209:29:542
111391260,0ptp4l0-21swapper/209:23:042
111391260,0ptp4l0-21swapper/110:10:231
111391260,0ptp4l0-21swapper/011:43:490
111391260,0ptp4l0-21swapper/011:33:140
111391260,0ptp4l0-21swapper/011:25:350
111391260,0ptp4l0-21swapper/011:21:270
111391260,0ptp4l0-21swapper/010:32:190
111391260,0ptp4l0-21swapper/010:17:320
111391260,0ptp4l0-21swapper/010:10:160
111391260,0ptp4l0-21swapper/009:15:220
111391250,3ptp4l0-21swapper/111:16:021
111391250,0ptp4l0-21swapper/712:31:127
111391250,0ptp4l0-21swapper/710:47:397
111391250,0ptp4l0-21swapper/710:23:547
111391250,0ptp4l0-21swapper/611:58:406
111391250,0ptp4l0-21swapper/511:28:035
111391250,0ptp4l0-21swapper/509:43:325
111391250,0ptp4l0-21swapper/410:33:544
111391250,0ptp4l0-21swapper/409:55:174
111391250,0ptp4l0-21swapper/409:55:174
111391250,0ptp4l0-21swapper/409:45:204
111391250,0ptp4l0-21swapper/409:40:184
111391250,0ptp4l0-21swapper/408:20:114
111391250,0ptp4l0-21swapper/109:21:081
111391250,0ptp4l0-21swapper/109:12:271
111391250,0ptp4l0-21swapper/108:50:141
111391250,0ptp4l0-21swapper/011:11:340
111391250,0ptp4l0-21swapper/010:41:580
111391250,0ptp4l0-21swapper/010:27:580
111391250,0ptp4l0-21swapper/010:05:130
111391250,0ptp4l0-21swapper/009:26:490
111391250,0ptp4l0-21swapper/009:00:100
111391250,0ptp4l0-21swapper/007:49:480
111391240,3ptp4l481ktimersoftd/411:06:334
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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