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2026-03-31 - 14:34

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 Tue Mar 31, 2026 00:46:11)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
111391640,6ptp4l0-21swapper/319:06:223
111391610,5ptp4l0-21swapper/419:05:134
1406925848,6sleep20-21swapper/219:09:262
1387525746,6sleep70-21swapper/719:06:587
1881915633,7phc2sys0-21swapper/019:06:210
1395125535,6sleep10-21swapper/119:07:571
1382424736,7sleep50-21swapper/519:06:165
1402024636,6sleep60-21swapper/619:08:506
83752420,0sleep10-21swapper/100:16:341
111391350,0ptp4l0-21swapper/323:00:003
111391340,3ptp4l0-21swapper/421:36:574
111391310,0ptp4l0-21swapper/519:50:145
111391310,0ptp4l0-21swapper/421:51:534
111391310,0ptp4l0-21swapper/000:25:210
111391300,4ptp4l0-21swapper/500:20:225
111391300,0ptp4l0-21swapper/521:20:155
111391300,0ptp4l0-21swapper/520:55:015
111391300,0ptp4l0-21swapper/423:09:104
111391300,0ptp4l0-21swapper/022:21:470
111391300,0ptp4l0-21swapper/021:18:210
111391290,0ptp4l0-21swapper/422:40:374
111391290,0ptp4l0-21swapper/422:40:374
111391290,0ptp4l0-21swapper/422:18:154
111391290,0ptp4l0-21swapper/421:27:454
111391290,0ptp4l0-21swapper/400:18:374
111391290,0ptp4l0-21swapper/221:54:312
111391290,0ptp4l0-21swapper/023:47:160
111391290,0ptp4l0-21swapper/023:09:040
111391290,0ptp4l0-21swapper/023:03:520
111391290,0ptp4l0-21swapper/021:54:020
111391280,1ptp4l10759-21sh22:48:374
111391280,0ptp4l24650-21ssh23:54:414
111391280,0ptp4l0-21swapper/521:18:165
111391280,0ptp4l0-21swapper/423:55:434
111391280,0ptp4l0-21swapper/423:10:224
111391280,0ptp4l0-21swapper/422:55:384
111391280,0ptp4l0-21swapper/122:00:561
111391280,0ptp4l0-21swapper/121:47:211
111391280,0ptp4l0-21swapper/022:02:090
111391280,0ptp4l0-21swapper/021:13:140
111391270,4ptp4l0-21swapper/022:40:490
111391270,4ptp4l0-21swapper/022:40:490
111391270,0ptp4l0-21swapper/423:32:544
111391270,0ptp4l0-21swapper/422:09:404
111391270,0ptp4l0-21swapper/422:01:514
111391270,0ptp4l0-21swapper/421:15:454
111391270,0ptp4l0-21swapper/400:37:234
111391270,0ptp4l0-21swapper/400:11:414
111391270,0ptp4l0-21swapper/400:06:494
111391270,0ptp4l0-21swapper/222:58:462
111391270,0ptp4l0-21swapper/119:29:551
111391270,0ptp4l0-21swapper/023:32:280
111391270,0ptp4l0-21swapper/000:38:260
111391270,0ptp4l0-21swapper/000:06:150
111391270,0ptp4l0-21swapper/000:02:140
111391260,6ptp4l0-21swapper/422:51:244
111391260,1ptp4l12785-21cpuspeed_turbos20:15:114
111391260,0ptp4l0-21swapper/523:25:055
111391260,0ptp4l0-21swapper/423:35:504
111391260,0ptp4l0-21swapper/423:26:504
111391260,0ptp4l0-21swapper/422:26:404
111391260,0ptp4l0-21swapper/421:14:534
111391260,0ptp4l0-21swapper/123:15:561
111391260,0ptp4l0-21swapper/119:30:111
111391260,0ptp4l0-21swapper/023:55:220
111391260,0ptp4l0-21swapper/023:38:490
111391260,0ptp4l0-21swapper/023:10:440
111391260,0ptp4l0-21swapper/022:57:250
111391260,0ptp4l0-21swapper/022:51:180
111391260,0ptp4l0-21swapper/021:56:030
111391260,0ptp4l0-21swapper/021:41:430
111391260,0ptp4l0-21swapper/021:23:060
111391260,0ptp4l0-21swapper/000:33:340
111391260,0ptp4l0-21swapper/000:22:250
111391250,1ptp4l25138-21memory19:30:164
111391250,0ptp4l0-21swapper/523:40:125
111391250,0ptp4l0-21swapper/521:50:155
111391250,0ptp4l0-21swapper/520:10:185
111391250,0ptp4l0-21swapper/520:05:185
111391250,0ptp4l0-21swapper/423:15:124
111391250,0ptp4l0-21swapper/422:30:224
111391250,0ptp4l0-21swapper/422:12:184
111391250,0ptp4l0-21swapper/122:09:041
111391250,0ptp4l0-21swapper/121:40:181
111391250,0ptp4l0-21swapper/121:30:191
111391250,0ptp4l0-21swapper/119:50:121
111391250,0ptp4l0-21swapper/119:40:111
111391250,0ptp4l0-21swapper/119:15:171
111391250,0ptp4l0-21swapper/023:43:060
111391250,0ptp4l0-21swapper/023:29:250
111391250,0ptp4l0-21swapper/021:38:510
111391250,0ptp4l0-21swapper/021:29:410
111391240,2ptp4l0-21swapper/023:24:160
111391240,1ptp4l22052-21cpuspeed_turbos20:35:125
111391240,1ptp4l18516-21cat20:25:214
111391240,1ptp4l18409-21timerwakeupswit00:30:191
111391240,1ptp4l1822-21memory22:35:181
111391240,1ptp4l1822-21memory22:35:171
111391240,1ptp4l16078-21sort21:25:004
111391240,0ptp4l0-21swapper/600:10:156
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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