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2026-04-10 - 18:16

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 Fri Apr 10, 2026 12:46:11)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
111391670,29ptp4l0-21swapper/007:05:130
111391610,5ptp4l0-21swapper/107:05:531
3053925949,6sleep70-21swapper/707:05:067
111391590,5ptp4l0-21swapper/507:07:255
3214325747,6sleep40-21swapper/407:06:084
63672560,0sleep00-21swapper/010:15:140
63672560,0sleep00-21swapper/010:15:130
70162550,0sleep50-21swapper/509:30:165
3245125141,6sleep20-21swapper/207:09:582
1881915132,14phc2sys0-21swapper/307:06:293
3221824834,9sleep60-21swapper/607:07:056
323282470,0sleep50-21swapper/512:22:235
111391340,0ptp4l0-21swapper/408:40:144
111391330,0ptp4l0-21swapper/409:35:174
111391320,0ptp4l0-21swapper/507:20:145
111391320,0ptp4l0-21swapper/409:20:144
111391310,0ptp4l0-21swapper/612:09:286
111391310,0ptp4l0-21swapper/010:20:150
111391310,0ptp4l0-21swapper/010:20:140
111391300,0ptp4l0-21swapper/412:00:144
111391300,0ptp4l0-21swapper/010:52:480
111391300,0ptp4l0-21swapper/009:37:180
111391300,0ptp4l0-21swapper/009:25:180
111391290,1ptp4l0-21swapper/411:50:174
111391290,0ptp4l0-21swapper/411:38:094
111391290,0ptp4l0-21swapper/410:17:464
111391290,0ptp4l0-21swapper/410:17:454
111391280,0ptp4l0-21swapper/710:44:447
111391280,0ptp4l0-21swapper/412:32:484
111391280,0ptp4l0-21swapper/410:38:474
111391280,0ptp4l0-21swapper/410:33:114
111391280,0ptp4l0-21swapper/409:46:594
111391280,0ptp4l0-21swapper/409:32:224
111391280,0ptp4l0-21swapper/409:17:584
111391280,0ptp4l0-21swapper/111:14:381
111391280,0ptp4l0-21swapper/010:13:140
111391280,0ptp4l0-21swapper/009:18:290
111391280,0ptp4l0-21swapper/009:11:580
111391270,1ptp4l0-21swapper/410:51:344
111391270,0ptp4l0-21swapper/510:22:275
111391270,0ptp4l0-21swapper/510:22:265
111391270,0ptp4l0-21swapper/510:10:315
111391270,0ptp4l0-21swapper/411:40:264
111391270,0ptp4l0-21swapper/411:08:364
111391270,0ptp4l0-21swapper/410:24:284
111391270,0ptp4l0-21swapper/410:24:274
111391270,0ptp4l0-21swapper/410:07:584
111391270,0ptp4l0-21swapper/410:04:344
111391270,0ptp4l0-21swapper/211:05:022
111391270,0ptp4l0-21swapper/012:19:450
111391270,0ptp4l0-21swapper/009:30:320
111391270,0ptp4l0-21swapper/009:20:190
111391260,0ptp4l0-21swapper/612:14:306
111391260,0ptp4l0-21swapper/611:03:026
111391260,0ptp4l0-21swapper/610:34:126
111391260,0ptp4l0-21swapper/607:50:126
111391260,0ptp4l0-21swapper/511:47:415
111391260,0ptp4l0-21swapper/412:35:374
111391260,0ptp4l0-21swapper/411:18:114
111391260,0ptp4l0-21swapper/211:48:172
111391260,0ptp4l0-21swapper/211:01:092
111391260,0ptp4l0-21swapper/210:47:122
111391260,0ptp4l0-21swapper/209:50:092
111391260,0ptp4l0-21swapper/011:50:130
111391260,0ptp4l0-21swapper/011:40:170
111391260,0ptp4l0-21swapper/011:02:320
111391260,0ptp4l0-21swapper/010:38:460
111391260,0ptp4l0-21swapper/010:05:200
111391260,0ptp4l0-21swapper/008:10:000
32740992521,3cyclictest11313-21cut07:30:164
111391250,1ptp4l32268-21cat08:15:204
111391250,1ptp4l2918-21df07:15:000
111391250,1ptp4l23850-21cpuspeed_turbos10:40:110
111391250,1ptp4l12692-21hddtemp_smartct08:45:124
111391250,0ptp4l14516-21ssh11:57:460
111391250,0ptp4l0-21swapper/710:25:417
111391250,0ptp4l0-21swapper/612:00:116
111391250,0ptp4l0-21swapper/510:35:405
111391250,0ptp4l0-21swapper/412:22:344
111391250,0ptp4l0-21swapper/412:14:394
111391250,0ptp4l0-21swapper/412:05:314
111391250,0ptp4l0-21swapper/411:31:344
111391250,0ptp4l0-21swapper/410:49:224
111391250,0ptp4l0-21swapper/409:25:124
111391250,0ptp4l0-21swapper/310:46:113
111391250,0ptp4l0-21swapper/310:25:203
111391250,0ptp4l0-21swapper/211:59:012
111391250,0ptp4l0-21swapper/207:20:192
111391250,0ptp4l0-21swapper/110:33:161
111391250,0ptp4l0-21swapper/012:27:260
111391250,0ptp4l0-21swapper/012:12:310
111391250,0ptp4l0-21swapper/012:06:080
111391250,0ptp4l0-21swapper/011:36:480
111391250,0ptp4l0-21swapper/011:23:490
111391250,0ptp4l0-21swapper/011:08:370
111391240,3ptp4l0-21swapper/409:44:454
111391240,1ptp4l7063-21users11:00:194
111391240,1ptp4l15958-21df_inode12:00:081
111391240,1ptp4l14025-21sed07:35:192
111391240,1ptp4l14025-21sed07:35:192
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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