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2026-04-27 - 18:14

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 Mon Apr 27, 2026 12:46:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
50142680,0sleep30-21swapper/310:30:203
111391630,5ptp4l0-21swapper/207:07:482
294382610,0sleep10-21swapper/112:30:101
111391610,30ptp4l0-21swapper/007:08:550
1881915645,6phc2sys0-21swapper/107:06:051
170462550,0sleep50-21swapper/510:05:075
1555825534,16sleep70-21swapper/707:09:457
1548025240,7sleep40-21swapper/407:08:464
1544524939,6sleep50-21swapper/507:08:155
111391490,4ptp4l0-21swapper/607:08:336
1537024635,7sleep30-21swapper/307:07:173
1588599420,19cyclictest0-21swapper/507:22:035
1588599345,18cyclictest0-21swapper/507:32:335
111391340,7ptp4l31759-21sh11:06:003
111391340,7ptp4l31759-21sh11:06:003
111391340,0ptp4l0-21swapper/011:17:220
111391330,0ptp4l0-21swapper/412:26:474
111391330,0ptp4l0-21swapper/011:14:410
111391320,0ptp4l0-21swapper/410:01:584
111391320,0ptp4l0-21swapper/109:25:191
111391320,0ptp4l0-21swapper/107:20:191
111391310,0ptp4l0-21swapper/710:21:487
111391310,0ptp4l0-21swapper/509:38:315
111391310,0ptp4l0-21swapper/309:00:183
111391310,0ptp4l0-21swapper/109:35:351
111391310,0ptp4l0-21swapper/012:26:370
111391300,0ptp4l0-21swapper/711:05:157
111391300,0ptp4l0-21swapper/711:05:157
111391300,0ptp4l0-21swapper/709:56:537
111391300,0ptp4l0-21swapper/511:50:195
111391300,0ptp4l0-21swapper/511:17:345
111391300,0ptp4l0-21swapper/411:54:364
111391300,0ptp4l0-21swapper/410:54:564
111391300,0ptp4l0-21swapper/409:58:154
111391300,0ptp4l0-21swapper/110:10:111
111391300,0ptp4l0-21swapper/009:29:530
111391300,0ptp4l0-21swapper/009:18:010
111391290,0ptp4l0-21swapper/711:30:097
111391290,0ptp4l0-21swapper/412:39:064
111391290,0ptp4l0-21swapper/412:07:484
111391290,0ptp4l0-21swapper/410:55:074
111391290,0ptp4l0-21swapper/410:14:064
111391290,0ptp4l0-21swapper/409:19:424
111391290,0ptp4l0-21swapper/311:26:363
111391290,0ptp4l0-21swapper/308:15:153
111391290,0ptp4l0-21swapper/109:23:441
111391290,0ptp4l0-21swapper/011:55:170
111391290,0ptp4l0-21swapper/010:39:430
111391290,0ptp4l0-21swapper/007:55:150
1588599283,15cyclictest0-21swapper/507:59:505
111391280,3ptp4l0-21swapper/509:22:545
111391280,0ptp4l0-21swapper/612:15:166
111391280,0ptp4l0-21swapper/611:38:376
111391280,0ptp4l0-21swapper/511:47:375
111391280,0ptp4l0-21swapper/511:04:365
111391280,0ptp4l0-21swapper/412:24:354
111391280,0ptp4l0-21swapper/411:12:524
111391280,0ptp4l0-21swapper/410:25:504
111391280,0ptp4l0-21swapper/410:19:534
111391280,0ptp4l0-21swapper/112:28:501
111391280,0ptp4l0-21swapper/011:30:420
111391280,0ptp4l0-21swapper/010:58:430
111391280,0ptp4l0-21swapper/009:33:010
1588599274,13cyclictest0-21swapper/507:37:255
1588599270,22cyclictest0-21swapper/507:44:035
111391270,3ptp4l0-21swapper/512:14:555
111391270,2ptp4l0-21swapper/410:36:204
111391270,1ptp4l3732-21fw_forwarded_lo10:30:124
111391270,0ptp4l0-21swapper/709:15:177
111391270,0ptp4l0-21swapper/708:30:207
111391270,0ptp4l0-21swapper/511:25:175
111391270,0ptp4l0-21swapper/511:10:295
111391270,0ptp4l0-21swapper/508:27:065
111391270,0ptp4l0-21swapper/508:27:065
111391270,0ptp4l0-21swapper/507:19:415
111391270,0ptp4l0-21swapper/412:10:154
111391270,0ptp4l0-21swapper/112:14:281
111391270,0ptp4l0-21swapper/111:07:091
111391270,0ptp4l0-21swapper/111:07:091
111391270,0ptp4l0-21swapper/110:39:151
111391270,0ptp4l0-21swapper/012:21:340
111391270,0ptp4l0-21swapper/011:47:510
111391270,0ptp4l0-21swapper/010:01:550
111391270,0ptp4l0-21swapper/008:50:140
111391260,3ptp4l0-21swapper/509:34:115
111391260,2ptp4l0-21swapper/108:23:061
111391260,1ptp4l0-21swapper/111:59:101
111391260,0ptp4l0-21swapper/512:35:295
111391260,0ptp4l0-21swapper/511:20:125
111391260,0ptp4l0-21swapper/511:06:235
111391260,0ptp4l0-21swapper/511:06:235
111391260,0ptp4l0-21swapper/309:56:103
111391260,0ptp4l0-21swapper/111:36:421
111391260,0ptp4l0-21swapper/109:33:591
111391260,0ptp4l0-21swapper/012:02:110
111391260,0ptp4l0-21swapper/011:26:480
111391260,0ptp4l0-21swapper/011:02:300
111391260,0ptp4l0-21swapper/010:48:200
111391260,0ptp4l0-21swapper/010:33:510
111391260,0ptp4l0-21swapper/010:15:120
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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