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2026-01-08 - 15:42

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 Jan 08, 2026 12:46:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
111391620,31ptp4l0-21swapper/007:05:260
111391580,5ptp4l0-21swapper/407:09:074
2301525746,7sleep70-21swapper/707:07:117
188092570,0sleep51068-21runrttasks10:42:225
2289925544,6sleep20-21swapper/207:05:382
1881915533,7phc2sys0-21swapper/107:09:551
111391550,5ptp4l0-21swapper/507:07:075
2289425241,6sleep60-21swapper/607:05:346
2289124636,6sleep30-21swapper/307:05:313
111391360,0ptp4l0-21swapper/111:50:011
111391340,0ptp4l0-21swapper/109:05:101
111391320,4ptp4l0-21swapper/110:58:221
111391320,4ptp4l0-21swapper/110:58:221
111391320,0ptp4l0-21swapper/412:32:244
111391320,0ptp4l0-21swapper/009:19:460
111391310,2ptp4l0-21swapper/109:35:001
111391310,1ptp4l4359-21/usr/sbin/munin08:50:121
111391310,0ptp4l0-21swapper/411:45:524
111391310,0ptp4l0-21swapper/110:09:341
111391310,0ptp4l0-21swapper/109:29:521
111391310,0ptp4l0-21swapper/011:00:160
111391310,0ptp4l0-21swapper/011:00:150
111391310,0ptp4l0-21swapper/010:00:440
111391300,0ptp4l0-21swapper/411:12:124
111391300,0ptp4l0-21swapper/111:30:141
111391300,0ptp4l0-21swapper/012:13:310
111391300,0ptp4l0-21swapper/010:10:000
111391300,0ptp4l0-21swapper/009:49:060
111391290,3ptp4l0-21swapper/412:37:044
111391290,0ptp4l0-21swapper/412:00:134
111391290,0ptp4l0-21swapper/410:58:514
111391290,0ptp4l0-21swapper/410:58:504
111391290,0ptp4l0-21swapper/410:45:204
111391290,0ptp4l0-21swapper/410:37:254
111391290,0ptp4l0-21swapper/410:01:004
111391290,0ptp4l0-21swapper/409:39:104
111391290,0ptp4l0-21swapper/110:33:171
111391290,0ptp4l0-21swapper/012:25:170
111391290,0ptp4l0-21swapper/012:07:580
111391290,0ptp4l0-21swapper/011:56:290
111391290,0ptp4l0-21swapper/011:31:470
111391280,3ptp4l0-21swapper/411:30:534
111391280,3ptp4l0-21swapper/410:16:244
111391280,0ptp4l12864-21diskmemload12:17:010
111391280,0ptp4l0-21swapper/709:13:237
111391280,0ptp4l0-21swapper/411:51:524
111391280,0ptp4l0-21swapper/410:29:214
111391280,0ptp4l0-21swapper/409:52:144
111391280,0ptp4l0-21swapper/408:45:104
111391280,0ptp4l0-21swapper/210:54:192
111391280,0ptp4l0-21swapper/012:02:120
111391280,0ptp4l0-21swapper/010:47:240
111391280,0ptp4l0-21swapper/009:27:040
111391280,0ptp4l0-21swapper/009:11:090
111391270,4ptp4l0-21swapper/011:38:120
111391270,3ptp4l0-21swapper/109:45:201
111391270,0ptp4l0-21swapper/610:50:416
111391270,0ptp4l0-21swapper/512:32:145
111391270,0ptp4l0-21swapper/512:11:365
111391270,0ptp4l0-21swapper/412:27:214
111391270,0ptp4l0-21swapper/412:21:394
111391270,0ptp4l0-21swapper/411:44:024
111391270,0ptp4l0-21swapper/411:29:234
111391270,0ptp4l0-21swapper/411:21:564
111391270,0ptp4l0-21swapper/411:19:124
111391270,0ptp4l0-21swapper/410:40:194
111391270,0ptp4l0-21swapper/409:19:154
111391270,0ptp4l0-21swapper/112:12:581
111391270,0ptp4l0-21swapper/011:07:280
111391270,0ptp4l0-21swapper/010:44:370
111391270,0ptp4l0-21swapper/010:37:150
111391270,0ptp4l0-21swapper/010:20:330
111391270,0ptp4l0-21swapper/009:40:000
111391270,0ptp4l0-21swapper/009:35:390
111391270,0ptp4l0-21swapper/007:15:000
111391260,3ptp4l0-21swapper/009:21:360
111391260,2ptp4l0-21swapper/010:55:080
111391260,2ptp4l0-21swapper/010:55:080
111391260,0ptp4l0-21swapper/710:30:007
111391260,0ptp4l0-21swapper/412:16:444
111391260,0ptp4l0-21swapper/412:05:084
111391260,0ptp4l0-21swapper/409:11:304
111391260,0ptp4l0-21swapper/112:39:231
111391260,0ptp4l0-21swapper/110:10:591
111391260,0ptp4l0-21swapper/012:35:570
111391260,0ptp4l0-21swapper/011:50:490
111391260,0ptp4l0-21swapper/009:57:540
111391250,1ptp4l30941-21timerandwakeup10:15:160
111391250,1ptp4l0-21swapper/410:07:464
111391250,0ptp4l0-21swapper/711:42:467
111391250,0ptp4l0-21swapper/711:17:207
111391250,0ptp4l0-21swapper/710:30:157
111391250,0ptp4l0-21swapper/411:04:154
111391250,0ptp4l0-21swapper/411:04:154
111391250,0ptp4l0-21swapper/409:42:294
111391250,0ptp4l0-21swapper/409:20:124
111391250,0ptp4l0-21swapper/407:39:194
111391250,0ptp4l0-21swapper/311:17:273
111391250,0ptp4l0-21swapper/310:22:503
111391250,0ptp4l0-21swapper/310:06:523
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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