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2026-05-07 - 20:20

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 May 07, 2026 12:46:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
111391640,30ptp4l0-21swapper/107:09:521
873026150,6sleep70-21swapper/707:08:587
1881916042,9phc2sys0-21swapper/507:06:065
111391600,5ptp4l0-21swapper/007:06:240
845525847,6sleep40-21swapper/407:05:264
691025846,7sleep20-21swapper/207:05:092
110032530,0sleep00-21swapper/009:24:190
872925029,6sleep60-21swapper/607:08:576
852724837,7sleep30-21swapper/307:06:213
42012460,1sleep41068-21runrttasks12:09:174
111391320,0ptp4l0-21swapper/512:16:295
111391310,0ptp4l0-21swapper/108:25:121
111391310,0ptp4l0-21swapper/108:25:111
111391300,0ptp4l0-21swapper/509:11:495
111391300,0ptp4l0-21swapper/508:55:105
111391300,0ptp4l0-21swapper/309:46:353
111391300,0ptp4l0-21swapper/008:00:110
111391290,0ptp4l0-21swapper/511:15:125
111391290,0ptp4l0-21swapper/511:03:235
111391290,0ptp4l0-21swapper/509:54:245
111391290,0ptp4l0-21swapper/310:05:053
111391290,0ptp4l0-21swapper/111:33:551
111391290,0ptp4l0-21swapper/110:51:341
111391290,0ptp4l0-21swapper/010:47:110
111391290,0ptp4l0-21swapper/009:48:160
111391280,3ptp4l241ktimersoftd/111:55:111
111391280,3ptp4l0-21swapper/109:21:511
111391280,0ptp4l0-21swapper/712:33:057
111391280,0ptp4l0-21swapper/712:18:387
111391280,0ptp4l0-21swapper/710:45:117
111391280,0ptp4l0-21swapper/710:31:517
111391280,0ptp4l0-21swapper/710:04:207
111391280,0ptp4l0-21swapper/509:44:395
111391280,0ptp4l0-21swapper/111:27:591
111391280,0ptp4l0-21swapper/111:19:441
111391280,0ptp4l0-21swapper/111:10:521
111391280,0ptp4l0-21swapper/110:34:541
111391280,0ptp4l0-21swapper/012:31:430
111391280,0ptp4l0-21swapper/012:21:440
111391280,0ptp4l0-21swapper/011:40:360
111391280,0ptp4l0-21swapper/010:37:560
111391280,0ptp4l0-21swapper/010:29:250
111391280,0ptp4l0-21swapper/010:19:550
111391280,0ptp4l0-21swapper/009:54:070
111391270,0ptp4l0-21swapper/711:58:127
111391270,0ptp4l0-21swapper/711:39:057
111391270,0ptp4l0-21swapper/710:26:137
111391270,0ptp4l0-21swapper/709:34:597
111391270,0ptp4l0-21swapper/309:35:293
111391270,0ptp4l0-21swapper/309:26:043
111391270,0ptp4l0-21swapper/309:22:473
111391270,0ptp4l0-21swapper/111:21:061
111391270,0ptp4l0-21swapper/012:39:580
111391270,0ptp4l0-21swapper/012:11:520
111391270,0ptp4l0-21swapper/011:22:280
111391270,0ptp4l0-21swapper/011:03:010
111391270,0ptp4l0-21swapper/009:16:170
111391260,3ptp4l0-21swapper/111:08:021
111391260,3ptp4l0-21swapper/111:08:021
111391260,1ptp4l6555-21sed10:00:134
111391260,1ptp4l13987-21ssh11:38:171
111391260,0ptp4l0-21swapper/711:50:117
111391260,0ptp4l0-21swapper/512:14:485
111391260,0ptp4l0-21swapper/512:02:105
111391260,0ptp4l0-21swapper/511:29:015
111391260,0ptp4l0-21swapper/509:45:115
111391260,0ptp4l0-21swapper/508:35:115
111391260,0ptp4l0-21swapper/311:58:063
111391260,0ptp4l0-21swapper/311:50:133
111391260,0ptp4l0-21swapper/311:32:453
111391260,0ptp4l0-21swapper/310:28:533
111391260,0ptp4l0-21swapper/112:35:001
111391260,0ptp4l0-21swapper/110:13:191
111391260,0ptp4l0-21swapper/010:13:580
111391260,0ptp4l0-21swapper/010:05:480
111391260,0ptp4l0-21swapper/009:57:530
111391250,0ptp4l0-21swapper/711:35:007
111391250,0ptp4l0-21swapper/711:23:107
111391250,0ptp4l0-21swapper/709:19:587
111391250,0ptp4l0-21swapper/511:40:115
111391250,0ptp4l0-21swapper/511:37:475
111391250,0ptp4l0-21swapper/511:21:415
111391250,0ptp4l0-21swapper/510:18:375
111391250,0ptp4l0-21swapper/412:20:144
111391250,0ptp4l0-21swapper/412:15:004
111391250,0ptp4l0-21swapper/409:50:154
111391250,0ptp4l0-21swapper/409:41:104
111391250,0ptp4l0-21swapper/409:31:174
111391250,0ptp4l0-21swapper/109:15:181
111391250,0ptp4l0-21swapper/107:15:001
111391250,0ptp4l0-21swapper/012:06:450
111391250,0ptp4l0-21swapper/009:14:090
912499240,23cyclictest0-21swapper/708:10:107
111391240,4ptp4l471rcuc/412:18:274
111391240,1ptp4l5941-21diskstats10:00:091
111391240,1ptp4l30685-21strings12:00:154
111391240,1ptp4l28066-21cpuspeed_turbos10:30:104
111391240,1ptp4l27107-21sh09:45:101
111391240,1ptp4l21712-21smart_sda10:20:180
111391240,1ptp4l11822-21memory07:15:005
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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