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2025-11-15 - 21:16

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 Sat Nov 15, 2025 12:46:11)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
114091670,36ptp4l0-21swapper/007:06:590
114091620,31ptp4l0-21swapper/107:09:071
759726151,6sleep60-21swapper/607:08:586
753425937,6sleep70-21swapper/707:08:117
71592590,0sleep30-21swapper/308:15:173
2120915734,7phc2sys0-21swapper/407:05:554
756525636,6sleep30-21swapper/307:08:313
114091560,5ptp4l0-21swapper/507:09:175
735424735,7sleep20-21swapper/207:05:492
7984993330,0cyclictest0-21swapper/512:35:065
7984993330,0cyclictest0-21swapper/512:35:065
114091330,0ptp4l0-21swapper/510:50:185
114091320,1ptp4l9534-21ssh09:22:011
114091320,0ptp4l0-21swapper/110:20:181
114091310,1ptp4l797099cyclictest11:27:483
114091310,0ptp4l0-21swapper/711:55:137
114091310,0ptp4l0-21swapper/709:45:147
114091310,0ptp4l0-21swapper/512:34:245
114091300,0ptp4l0-21swapper/711:36:057
114091300,0ptp4l0-21swapper/711:16:337
114091300,0ptp4l0-21swapper/511:18:345
114091300,0ptp4l0-21swapper/210:33:452
114091300,0ptp4l0-21swapper/209:41:152
114091290,0ptp4l0-21swapper/710:40:177
114091290,0ptp4l0-21swapper/710:25:337
114091290,0ptp4l0-21swapper/310:23:113
114091290,0ptp4l0-21swapper/209:14:292
114091290,0ptp4l0-21swapper/111:58:041
114091290,0ptp4l0-21swapper/109:39:261
114091280,4ptp4l16525-21sh12:23:287
114091280,0ptp4l31164-21diskmemload11:58:395
114091280,0ptp4l0-21swapper/711:32:107
114091280,0ptp4l0-21swapper/709:44:007
114091280,0ptp4l0-21swapper/609:49:036
114091280,0ptp4l0-21swapper/509:54:025
114091280,0ptp4l0-21swapper/509:23:485
114091280,0ptp4l0-21swapper/309:44:393
114091280,0ptp4l0-21swapper/212:17:352
114091280,0ptp4l0-21swapper/209:55:582
114091280,0ptp4l0-21swapper/110:17:341
114091280,0ptp4l0-21swapper/109:34:411
114091280,0ptp4l0-21swapper/109:26:091
114091270,1ptp4l31164-21diskmemload09:33:372
114091270,1ptp4l0-21swapper/010:30:130
114091270,0ptp4l0-21swapper/710:53:237
114091270,0ptp4l0-21swapper/612:20:216
114091270,0ptp4l0-21swapper/612:19:346
114091270,0ptp4l0-21swapper/610:31:466
114091270,0ptp4l0-21swapper/511:21:095
114091270,0ptp4l0-21swapper/510:35:465
114091270,0ptp4l0-21swapper/311:11:563
114091270,0ptp4l0-21swapper/209:26:312
114091270,0ptp4l0-21swapper/112:01:331
114091260,2ptp4l0-21swapper/509:26:155
114091260,1ptp4l22876-21ssh11:47:527
114091260,0ptp4l0-21swapper/711:54:497
114091260,0ptp4l0-21swapper/709:39:397
114091260,0ptp4l0-21swapper/611:41:526
114091260,0ptp4l0-21swapper/611:05:516
114091260,0ptp4l0-21swapper/511:06:305
114091260,0ptp4l0-21swapper/509:30:135
114091260,0ptp4l0-21swapper/312:04:573
114091260,0ptp4l0-21swapper/212:20:062
114091260,0ptp4l0-21swapper/212:13:532
798499252,18cyclictest87350irq/31-eno1-rx-11:36:125
114091250,1ptp4l5894-21irqstats11:25:171
114091250,0ptp4l0-21swapper/710:00:167
114091250,0ptp4l0-21swapper/710:00:167
114091250,0ptp4l0-21swapper/612:13:116
114091250,0ptp4l0-21swapper/607:55:206
114091250,0ptp4l0-21swapper/510:15:125
114091250,0ptp4l0-21swapper/508:10:165
114091250,0ptp4l0-21swapper/507:50:235
114091250,0ptp4l0-21swapper/507:29:295
114091250,0ptp4l0-21swapper/507:29:295
114091250,0ptp4l0-21swapper/212:08:522
114091250,0ptp4l0-21swapper/211:42:012
114091250,0ptp4l0-21swapper/209:51:432
114091250,0ptp4l0-21swapper/207:30:172
114091250,0ptp4l0-21swapper/112:05:111
114091250,0ptp4l0-21swapper/109:53:411
114091250,0ptp4l0-21swapper/108:50:121
114091250,0ptp4l0-21swapper/008:35:160
114091250,0ptp4l0-21swapper/008:10:140
114091240,1ptp4l811-21NetworkManager08:10:001
114091240,1ptp4l6757-21cat10:00:225
114091240,1ptp4l6757-21cat10:00:225
114091240,1ptp4l65-21ksoftirqd/607:40:226
114091240,1ptp4l31439-21wc08:00:012
114091240,1ptp4l20404-21cpuspeed_turbos11:45:125
114091240,1ptp4l16863-21/usr/sbin/munin11:40:145
114091240,0ptp4l0-21swapper/712:31:127
114091240,0ptp4l0-21swapper/712:27:057
114091240,0ptp4l0-21swapper/711:00:127
114091240,0ptp4l0-21swapper/710:55:157
114091240,0ptp4l0-21swapper/710:10:217
114091240,0ptp4l0-21swapper/709:05:167
114091240,0ptp4l0-21swapper/707:20:157
114091240,0ptp4l0-21swapper/707:20:157
114091240,0ptp4l0-21swapper/610:45:226
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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