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2026-08-26 - 11:54

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #b, 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 rackbslot8s (updated Wed Aug 26, 2026 00:44:19)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
28828802145131,9sleep60-21swapper/619:06:026
28818692125113,7sleep10-21swapper/119:05:171
28830912121107,9sleep30-21swapper/319:09:033
28831242119105,9sleep70-21swapper/719:09:327
2883083211988,10sleep40-21swapper/419:08:564
28830162117102,9sleep20-21swapper/219:07:572
2883079211399,9sleep00-21swapper/019:08:520
2883104210792,10sleep50-21swapper/519:09:135
2883407991020,1cyclictest0-21swapper/721:15:157
2883407991020,101cyclictest0-21swapper/721:38:017
2883407991020,100cyclictest0-21swapper/722:47:277
288339999102100,2cyclictest553-21snmpd00:19:005
28833839910299,3cyclictest3018314-21cat22:15:161
288338399102100,2cyclictest553-21snmpd22:38:001
2883380991020,102cyclictest0-21swapper/019:25:150
2883407991010,100cyclictest0-21swapper/721:25:547
2883407991010,0cyclictest0-21swapper/719:55:467
28834039910199,1cyclictest553-21snmpd23:13:186
28833999910199,2cyclictest553-21snmpd23:38:265
28833999910199,2cyclictest553-21snmpd22:35:395
28833979910199,2cyclictest553-21snmpd23:54:564
28833979910199,2cyclictest553-21snmpd23:25:404
28833979910199,2cyclictest553-21snmpd23:25:404
288339799101100,1cyclictest553-21snmpd22:49:214
2883397991010,100cyclictest0-21swapper/400:30:134
2883397991010,100cyclictest0-21swapper/400:16:394
28833889910199,2cyclictest553-21snmpd22:05:262
2883388991010,100cyclictest0-21swapper/200:23:242
28833839910199,2cyclictest553-21snmpd23:39:351
2883383991010,101cyclictest0-21swapper/122:20:111
2883383991010,101cyclictest0-21swapper/119:18:121
2883383991010,100cyclictest0-21swapper/122:07:021
28833809910199,2cyclictest553-21snmpd22:47:360
2883380991010,101cyclictest0-21swapper/022:42:120
2883407991000,99cyclictest0-21swapper/723:34:507
2883407991000,99cyclictest0-21swapper/722:39:277
2883407991000,99cyclictest0-21swapper/721:59:027
2883407991000,99cyclictest0-21swapper/719:42:547
2883407991000,99cyclictest0-21swapper/700:26:487
2883407991000,98cyclictest0-21swapper/719:35:277
2883407991000,100cyclictest0-21swapper/723:04:467
2883407991000,100cyclictest0-21swapper/722:28:177
2883407991000,100cyclictest0-21swapper/719:28:517
2883407991000,100cyclictest0-21swapper/719:20:327
2883407991000,0cyclictest0-21swapper/723:35:507
28834039910099,1cyclictest553-21snmpd22:31:146
28834039910099,1cyclictest553-21snmpd21:40:136
28834039910099,1cyclictest553-21snmpd21:18:426
28834039910099,1cyclictest553-21snmpd20:56:236
28834039910099,1cyclictest553-21snmpd20:22:206
28834039910099,1cyclictest553-21snmpd20:06:076
28834039910099,1cyclictest553-21snmpd00:35:196
28834039910099,1cyclictest553-21snmpd00:16:186
28834039910099,1cyclictest553-21snmpd00:00:576
28834039910099,1cyclictest3062382-21cat22:55:156
2883403991000,99cyclictest0-21swapper/623:09:226
2883403991000,99cyclictest0-21swapper/621:10:576
2883403991000,100cyclictest0-21swapper/600:28:156
28833999910099,1cyclictest553-21snmpd23:15:315
28833999910099,1cyclictest553-21snmpd23:15:315
28833999910099,1cyclictest553-21snmpd20:54:355
28833999910099,1cyclictest553-21snmpd19:45:365
288339999100100,0cyclictest553-21snmpd23:21:585
288339999100100,0cyclictest553-21snmpd23:21:585
2883399991000,99cyclictest0-21swapper/521:44:525
2883399991000,99cyclictest0-21swapper/520:35:175
2883399991000,99cyclictest0-21swapper/500:04:335
28833979910099,1cyclictest553-21snmpd23:32:054
28833979910099,1cyclictest553-21snmpd20:42:534
28833979910099,1cyclictest553-21snmpd20:25:414
28833979910099,1cyclictest553-21snmpd19:21:304
28833979910098,2cyclictest553-21snmpd00:14:004
2883397991000,99cyclictest0-21swapper/422:32:504
2883397991000,99cyclictest0-21swapper/421:31:524
2883397991000,100cyclictest0-21swapper/422:24:594
2883397991000,100cyclictest0-21swapper/421:10:514
2883397991000,0cyclictest2959833-21ssh21:22:454
28833929910099,1cyclictest553-21snmpd21:59:143
28833929910099,1cyclictest553-21snmpd19:58:223
28833929910099,1cyclictest553-21snmpd19:37:453
28833929910099,1cyclictest553-21snmpd19:34:243
28833889910099,1cyclictest553-21snmpd22:56:092
28833889910099,1cyclictest553-21snmpd22:52:152
28833889910099,1cyclictest553-21snmpd22:26:022
28833889910099,1cyclictest553-21snmpd22:19:562
28833889910099,1cyclictest553-21snmpd21:00:302
28833889910099,1cyclictest553-21snmpd20:10:462
28833889910099,1cyclictest553-21snmpd00:15:422
28833889910099,1cyclictest2927952-21cat20:35:152
2883388991000,99cyclictest0-21swapper/223:56:022
2883388991000,99cyclictest0-21swapper/223:24:222
2883388991000,99cyclictest0-21swapper/223:24:212
2883388991000,99cyclictest0-21swapper/221:18:512
2883388991000,99cyclictest0-21swapper/200:30:312
2883388991000,100cyclictest0-21swapper/222:36:112
2883388991000,100cyclictest0-21swapper/222:34:332
2883388991000,100cyclictest0-21swapper/200:35:102
28833839910099,1cyclictest553-21snmpd00:33:131
28833839910098,2cyclictest553-21snmpd23:28:581
28833839910098,2cyclictest553-21snmpd23:28:581
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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