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2025-07-01 - 05:27

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, 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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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 50 highest latencies:
System rack0slot6s.osadl.org (updated Tue Jul 01, 2025 00:46:19)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
379812799908,37cyclictest0-21swapper/219:15:0112
39134192820,0sleep90-21swapper/921:05:2119
58366220740,66data-loop.00-21swapper/819:05:1818
58366220720,70data-loop.00-21swapper/619:06:3716
58366620670,57data-loop.00-21swapper/1819:06:2810
58366220670,65data-loop.00-21swapper/419:05:0514
58366220660,64data-loop.00-21swapper/1619:06:348
58366220660,58data-loop.00-21swapper/319:09:3213
58366220650,63data-loop.00-21swapper/119:08:031
58366620640,62data-loop.00-21swapper/719:05:5017
58366220640,62data-loop.00-21swapper/1719:05:529
58366220640,62data-loop.00-21swapper/1419:09:406
58366220630,61data-loop.00-21swapper/1319:09:345
58366220630,61data-loop.00-21swapper/1119:05:033
58366220630,42data-loop.00-21swapper/1519:06:287
58366220590,52data-loop.00-21swapper/519:06:2815
58366220590,51data-loop.00-21swapper/919:07:0019
58366220550,53data-loop.00-21swapper/1019:09:232
58366220550,52data-loop.00-21swapper/1919:07:1011
58366220530,50data-loop.00-21swapper/019:09:180
58366220530,32data-loop.00-21swapper/219:05:5512
40799232520,1sleep17181-21ksoftirqd/1700:00:049
58366220510,46data-loop.00-21swapper/1219:07:144
3798141994627,0cyclictest0-21swapper/620:53:1016
3798141994627,0cyclictest0-21swapper/620:53:1016
379817599440,1cyclictest3866461-40tracker-miner-f20:17:0010
3798168994442,1cyclictest3900567-40tracker-miner-f20:54:588
3798168994442,1cyclictest3900567-40tracker-miner-f20:54:588
3798146994313,29cyclictest941irq_work/820:56:5518
3798146994313,29cyclictest941irq_work/820:56:5518
379814699430,34cyclictest3529454-21firefox21:00:1018
379814699430,34cyclictest3529454-21firefox21:00:0918
3798143994342,1cyclictest3861671-40tracker-miner-f20:11:4917
58366620420,1data-loop.00-21swapper/1722:50:149
379817599420,0cyclictest0-21swapper/1819:10:0310
3798157994140,0cyclictest0-21swapper/1223:18:004
379814199414,36cyclictest80-21ksoftirqd/623:10:1516
3798141994140,1cyclictest3862132-40tracker-miner-f20:15:0716
3798175994034,5cyclictest0-21swapper/1822:50:1410
3798173994013,27cyclictest1771irq_work/1720:25:339
3798157994038,1cyclictest1341rcuc/1219:55:064
3798141994040,0cyclictest0-21swapper/623:40:1816
3798141994039,0cyclictest0-21swapper/623:18:0016
379817599390,32cyclictest0-21swapper/1821:36:3410
3798160993918,0cyclictest0-21swapper/1321:11:365
3798157993939,0cyclictest0-21swapper/1220:15:074
3798148993938,1cyclictest0-21swapper/920:08:1019
3798141993937,1cyclictest0-21swapper/620:57:5616
3798141993937,1cyclictest0-21swapper/620:57:5516
58366620380,1data-loop.04082283-21ntpq00:00:1811
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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