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2026-08-20 - 10:14

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 Thu Aug 20, 2026 00:44:17)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
4369132124106,13sleep60-21swapper/619:07:066
437038212293,9sleep10-21swapper/119:08:531
435006212192,10sleep30-21swapper/319:05:113
437064211988,10sleep00-21swapper/019:09:160
4370512119105,9sleep50-21swapper/519:09:055
4370662115101,9sleep20-21swapper/219:09:192
437086210995,9sleep40-21swapper/419:09:374
437053210893,10sleep70-21swapper/719:09:077
437359991030,102cyclictest0-21swapper/223:10:142
437373991020,100cyclictest0-21swapper/621:33:346
437373991020,100cyclictest0-21swapper/619:24:166
4373599910299,3cyclictest553-21snmpd19:22:402
4373599910299,1cyclictest553-21snmpd21:15:192
437359991020,101cyclictest0-21swapper/223:29:112
437359991020,0cyclictest0-21swapper/200:00:182
437354991020,99cyclictest0-21swapper/100:34:281
437354991020,0cyclictest0-21swapper/120:29:581
4373709910199,2cyclictest553-21snmpd23:42:115
4373709910199,2cyclictest553-21snmpd22:26:005
4373709910199,2cyclictest553-21snmpd21:46:385
4373709910199,2cyclictest553-21snmpd19:38:585
4373709910199,2cyclictest553-21snmpd19:11:395
4373709910199,2cyclictest464589-21cat20:00:165
4373709910198,3cyclictest553-21snmpd19:29:045
4373689910199,1cyclictest605-21lldpd19:56:284
4373639910199,2cyclictest553-21snmpd00:31:073
4373639910199,2cyclictest553-21snmpd00:08:573
4373599910199,0cyclictest553-21snmpd19:43:432
4373599910196,2cyclictest553-21snmpd21:55:322
437359991010,101cyclictest0-21swapper/220:14:502
437359991010,100cyclictest0-21swapper/222:48:222
4373549910199,2cyclictest553-21snmpd22:46:161
437354991010,101cyclictest0-21swapper/119:29:041
437354991010,100cyclictest0-21swapper/122:24:121
437354991010,0cyclictest0-21swapper/121:46:391
4373509910199,2cyclictest553-21snmpd23:00:400
4373509910199,1cyclictest553-21snmpd21:24:520
43735099101100,1cyclictest553-21snmpd23:16:270
437350991010,100cyclictest0-21swapper/022:59:250
4373789910099,1cyclictest0-21swapper/720:09:057
437378991000,99cyclictest0-21swapper/722:15:367
437378991000,1cyclictest0-21swapper/723:19:597
437378991000,100cyclictest0-21swapper/722:56:107
437378991000,100cyclictest0-21swapper/722:22:517
437378991000,100cyclictest0-21swapper/720:12:207
437378991000,100cyclictest0-21swapper/719:40:197
4373739910099,1cyclictest679484-21cat23:50:146
4373739910099,1cyclictest553-21snmpd23:40:176
4373739910099,1cyclictest553-21snmpd23:37:236
4373739910098,2cyclictest553-21snmpd19:28:106
4373739910098,1cyclictest553-21snmpd00:10:486
4373739910097,3cyclictest553-21snmpd22:31:126
437373991000,99cyclictest0-21swapper/620:18:306
437373991000,99cyclictest0-21swapper/619:43:586
437373991000,100cyclictest0-21swapper/623:45:446
437373991000,100cyclictest0-21swapper/620:27:366
437373991000,100cyclictest0-21swapper/600:19:046
4373709910099,1cyclictest553-21snmpd21:51:055
4373709910099,1cyclictest553-21snmpd20:23:185
4373709910098,2cyclictest553-21snmpd23:01:225
4373709910098,2cyclictest553-21snmpd20:29:575
4373709910098,2cyclictest553-21snmpd00:34:285
4373689910099,1cyclictest553-21snmpd23:38:444
4373689910099,1cyclictest553-21snmpd22:13:424
4373689910099,1cyclictest553-21snmpd21:59:024
4373689910099,1cyclictest553-21snmpd19:16:284
4373689910099,1cyclictest553-21snmpd00:22:104
437368991000,99cyclictest0-21swapper/421:44:414
437368991000,99cyclictest0-21swapper/420:49:124
437368991000,100cyclictest0-21swapper/422:45:584
437368991000,100cyclictest0-21swapper/422:27:514
4373639910099,1cyclictest553-21snmpd23:38:323
4373639910099,1cyclictest553-21snmpd22:59:013
4373639910099,1cyclictest553-21snmpd22:39:213
4373639910099,1cyclictest553-21snmpd21:54:393
4373599910099,1cyclictest553-21snmpd21:43:022
4373599910099,1cyclictest457039-21cat19:45:142
4373599910097,1cyclictest553-21snmpd20:52:062
437359991000,99cyclictest0-21swapper/223:35:532
437359991000,100cyclictest0-21swapper/223:56:002
437359991000,100cyclictest0-21swapper/220:06:352
437359991000,100cyclictest0-21swapper/200:27:192
4373549910099,1cyclictest553-21snmpd22:03:381
4373549910099,1cyclictest553-21snmpd19:59:321
4373549910098,2cyclictest553-21snmpd22:31:271
4373549910098,2cyclictest553-21snmpd21:52:591
4373549910098,2cyclictest553-21snmpd20:56:361
4373549910097,3cyclictest553-21snmpd21:55:081
4373549910097,3cyclictest553-21snmpd19:30:111
437354991000,99cyclictest0-21swapper/121:08:461
4373509910099,1cyclictest553-21snmpd23:57:300
4373509910099,1cyclictest553-21snmpd23:51:450
4373509910099,1cyclictest553-21snmpd19:45:190
4373509910098,2cyclictest553-21snmpd21:48:050
4373509910098,2cyclictest553-21snmpd20:12:410
437350991000,99cyclictest0-21swapper/020:01:410
437350991000,100cyclictest0-21swapper/019:22:520
437350991000,100cyclictest0-21swapper/000:32:310
437350991000,100cyclictest0-21swapper/000:19:280
437378999997,2cyclictest0-21swapper/722:34:127
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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