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2025-09-18 - 23:21

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, slot #5

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 rack0slot5s.osadl.org (updated Thu Sep 18, 2025 00:47:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
25251672377336,32sleep130-21swapper/1319:09:325
25250262353329,16sleep10-21swapper/119:07:271
25249252347320,18sleep150-21swapper/1519:06:057
25251592344317,18sleep50-21swapper/519:09:2411
25250052342314,19sleep140-21swapper/1419:07:086
25250902341314,18sleep100-21swapper/1019:08:252
25249972341315,18sleep60-21swapper/619:07:0012
25249822341314,18sleep80-21swapper/819:06:4614
25251632339314,17sleep90-21swapper/919:09:2815
25250922339312,18sleep120-21swapper/1219:08:274
25249272339312,18sleep00-21swapper/019:06:060
25251982338313,17sleep40-21swapper/419:09:5610
25251652338310,18sleep110-21swapper/1119:09:303
25249512338311,18sleep20-21swapper/219:06:248
25251242336308,19sleep70-21swapper/719:08:5413
25250112332307,17sleep30-21swapper/319:07:139
2525497993820,17cyclictest1526-21snmpd19:22:511
2525548993226,5cyclictest1526-21snmpd23:35:415
252554899320,31cyclictest0-21swapper/1321:17:345
252551999326,26cyclictest0-21swapper/620:55:4712
252550899325,17cyclictest0-21swapper/422:30:1410
252550899325,17cyclictest0-21swapper/422:30:1410
2525500993226,5cyclictest1526-21snmpd20:09:108
2525556993130,1cyclictest0-21swapper/1519:25:097
252554899310,30cyclictest0-21swapper/1322:27:305
252551999316,25cyclictest0-21swapper/620:11:5112
252551999315,26cyclictest0-21swapper/619:49:5312
2525519993125,5cyclictest1526-21snmpd19:10:0212
252550099310,28cyclictest0-21swapper/223:06:498
2525541993026,3cyclictest1526-21snmpd20:29:533
2525529993029,1cyclictest0-21swapper/819:19:0314
252551999306,13cyclictest0-21swapper/600:24:2812
252551999305,13cyclictest0-21swapper/623:51:3112
252551999305,13cyclictest0-21swapper/600:35:2712
252551999304,26cyclictest0-21swapper/621:17:4512
252551299306,16cyclictest0-21swapper/519:15:1411
2525537992916,10cyclictest3485303-21CPU2
252551999294,13cyclictest0-21swapper/622:23:3912
2525512992927,2cyclictest1526-21snmpd20:36:0511
2525512992927,2cyclictest1526-21snmpd20:36:0511
2525551992827,1cyclictest1526-21snmpd00:23:136
2525551992827,1cyclictest0-21swapper/1422:22:426
252554899280,27cyclictest0-21swapper/1319:26:125
252554899280,1cyclictest0-21swapper/1319:15:425
252554399280,28cyclictest0-21swapper/1220:11:044
252554399280,27cyclictest0-21swapper/1219:13:354
2525532992826,2cyclictest1526-21snmpd21:57:5315
252553299280,27cyclictest0-21swapper/922:10:0515
2525529992827,1cyclictest1526-21snmpd23:25:5914
2525524992827,1cyclictest1526-21snmpd19:18:1513
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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