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2026-04-07 - 13:55

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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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 Tue Apr 07, 2026 12:43:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
30382991024,91cyclictest0-21swapper/008:06:080
248599970,5rtkit-daemon0-21swapper/305:21:453
3038299953,84cyclictest0-21swapper/008:07:070
3038299943,48cyclictest16761-21grep10:21:490
3038299935,81cyclictest0-21swapper/009:51:500
3038299934,83cyclictest0-21swapper/009:16:520
3038299924,81cyclictest0-21swapper/009:41:430
3038299924,70cyclictest0-21swapper/009:01:560
3038299923,82cyclictest0-21swapper/007:33:350
30382999212,45cyclictest0-21swapper/007:46:510
30382999212,45cyclictest0-21swapper/007:46:510
3038299904,67cyclictest0-21swapper/010:31:300
3038299904,67cyclictest0-21swapper/010:31:300
3038299903,80cyclictest28552-21unixbench_singl07:27:110
3038299894,78cyclictest0-21swapper/009:11:340
3038299894,78cyclictest0-21swapper/009:11:340
3038299894,78cyclictest0-21swapper/007:40:440
3038299894,77cyclictest0-21swapper/010:46:500
3038299893,78cyclictest0-21swapper/007:42:070
271902890,8sleep13038699cyclictest09:01:511
3038299884,77cyclictest0-21swapper/010:01:550
3038299884,77cyclictest0-21swapper/009:00:190
3038299884,63cyclictest0-21swapper/006:36:500
3038299883,77cyclictest0-21swapper/009:21:460
3038299874,76cyclictest0-21swapper/010:14:280
3038299874,76cyclictest0-21swapper/008:43:330
3038299874,76cyclictest0-21swapper/008:16:480
3038299874,76cyclictest0-21swapper/008:00:090
3038299874,75cyclictest0-21swapper/005:31:570
3038299874,74cyclictest25433-21ssh07:23:080
3038299874,64cyclictest0-21swapper/009:11:440
3038299873,77cyclictest0-21swapper/009:38:010
3038299873,77cyclictest0-21swapper/008:15:410
3038299873,67cyclictest0-21swapper/010:36:310
3038299873,65cyclictest0-21swapper/008:36:460
3038299864,75cyclictest0-21swapper/010:36:410
3038299864,75cyclictest0-21swapper/009:56:440
3038299864,75cyclictest0-21swapper/008:52:070
3038299864,75cyclictest0-21swapper/007:52:010
3038299864,66cyclictest0-21swapper/009:47:040
3038299864,66cyclictest0-21swapper/009:47:040
3038299864,64cyclictest0-21swapper/010:06:590
3038299863,76cyclictest0-21swapper/009:31:350
3038299863,76cyclictest0-21swapper/009:26:350
3038299863,76cyclictest0-21swapper/008:30:570
3038299863,76cyclictest0-21swapper/008:30:570
3038299863,65cyclictest0-21swapper/008:50:230
3038299854,74cyclictest0-21swapper/008:35:360
3038299854,74cyclictest0-21swapper/008:26:130
3038299854,74cyclictest0-21swapper/006:10:460
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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