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2026-04-03 - 15:20

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #1, slot #6

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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  Intel
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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
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack1slot6s.osadl.org (updated Fri Apr 03, 2026 12:43:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
20476991006,70cyclictest0-21swapper/008:25:540
248599990,7rtkit-daemon0-21swapper/108:10:461
248599990,6rtkit-daemon0-21swapper/105:26:001
2047699995,72cyclictest0-21swapper/009:25:440
2047699995,72cyclictest0-21swapper/009:25:440
2048399984,49cyclictest0-21swapper/205:35:462
2047699984,71cyclictest0-21swapper/010:40:270
2047699984,71cyclictest0-21swapper/010:40:270
2047699974,68cyclictest0-21swapper/010:07:070
20476999720,70cyclictest4105-21proc_pri10:20:440
2047699959,62cyclictest0-21swapper/010:45:500
2047699954,71cyclictest0-21swapper/009:44:380
2047699954,70cyclictest0-21swapper/009:55:340
2047699944,67cyclictest0-21swapper/009:31:310
2047699935,68cyclictest0-21swapper/007:25:470
2047699934,71cyclictest0-21swapper/009:47:500
2047699934,70cyclictest1419-21runrttasks07:45:530
2047699934,63cyclictest0-21swapper/007:20:350
2047699926,69cyclictest0-21swapper/008:35:360
2047699925,68cyclictest0-21swapper/009:35:300
2047699924,69cyclictest0-21swapper/007:40:390
2047699924,67cyclictest0-21swapper/008:42:130
2047699924,64cyclictest0-21swapper/010:02:540
2047699924,64cyclictest0-21swapper/010:02:540
2047699923,21cyclictest16694-21ssh08:15:460
2047699915,69cyclictest0-21swapper/010:50:190
2047699914,70cyclictest0-21swapper/010:35:160
2047699914,68cyclictest0-21swapper/006:40:470
2047699914,65cyclictest0-21swapper/008:46:440
2047699914,65cyclictest0-21swapper/008:46:440
2047699914,63cyclictest0-21swapper/010:12:080
2047699914,62cyclictest0-21swapper/010:38:450
2047699913,24cyclictest3232-21needreboot07:55:460
20476999118,8cyclictest15858-21ssh09:02:480
20476999116,56cyclictest0-21swapper/007:50:580
2047699904,68cyclictest0-21swapper/009:16:130
2047699904,68cyclictest0-21swapper/008:20:340
2047699904,63cyclictest0-21swapper/009:53:160
2047699894,77cyclictest17539-21fschecks_count07:30:400
2047699894,77cyclictest17539-21fschecks_count07:30:400
2047699894,69cyclictest0-21swapper/010:25:290
2047699894,66cyclictest0-21swapper/005:33:280
2047699894,64cyclictest0-21swapper/008:10:380
2047699894,62cyclictest0-21swapper/008:57:490
2047699894,62cyclictest0-21swapper/008:34:460
20476998919,52cyclictest0-21swapper/005:55:470
20476998913,13cyclictest0-21swapper/006:35:540
2047699885,61cyclictest0-21swapper/009:24:140
2047699884,63cyclictest0-21swapper/008:53:130
20476998819,51cyclictest0-21swapper/008:00:590
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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