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2026-03-27 - 23:43

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 Fri Mar 27, 2026 12:43:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
8498999913,27cyclictest13850-21crond11:01:462
849899983,47cyclictest0-21swapper/210:26:402
8493999815,12cyclictest1419-21runrttasks09:22:050
8498999718,19cyclictest32125-21rm09:52:062
8498999718,19cyclictest32125-21rm09:52:062
8498999633,11cyclictest10427-21grep05:32:332
8498999633,11cyclictest10427-21grep05:32:332
849399964,26cyclictest0-21swapper/010:23:540
8493999625,10cyclictest1419-21runrttasks09:04:300
849899955,83cyclictest29664-21gltestperf08:12:122
8498999539,10cyclictest19465-21tail05:52:232
8493999526,61cyclictest0-21swapper/010:01:490
8493999427,13cyclictest0-21swapper/010:41:580
8493999419,13cyclictest0-21swapper/008:47:220
849899933,50cyclictest0-21swapper/209:32:112
849899933,45cyclictest0-21swapper/207:44:492
849899933,45cyclictest0-21swapper/207:44:492
849399936,28cyclictest0-21swapper/008:42:080
849399934,26cyclictest19067-21grep07:57:070
849899924,13cyclictest0-21swapper/208:32:132
849799924,12cyclictest0-21swapper/110:36:481
849799924,12cyclictest0-21swapper/110:36:481
849399924,35cyclictest0-21swapper/005:47:160
849399915,26cyclictest0-21swapper/009:27:110
849399915,13cyclictest0-21swapper/008:12:110
849399914,34cyclictest0-21swapper/009:11:510
849399914,34cyclictest0-21swapper/009:11:510
8493999122,13cyclictest0-21swapper/008:21:480
849799904,15cyclictest0-21swapper/110:27:191
849799903,10cyclictest2790-21cat09:07:221
849799903,10cyclictest2790-21cat09:07:221
849399908,12cyclictest0-21swapper/010:27:080
849399904,33cyclictest8488-21cyclictest05:32:000
849399904,32cyclictest1419-21runrttasks11:00:390
849399904,12cyclictest0-21swapper/010:07:080
849399903,22cyclictest22079-21aten2.4-expect08:02:050
8493999016,10cyclictest20018-21ssh09:32:330
8493999010,23cyclictest27198-21runrttasks09:44:160
849399895,33cyclictest0-21swapper/006:07:120
849399895,26cyclictest0-21swapper/010:36:480
849399895,26cyclictest0-21swapper/010:36:480
849399895,16cyclictest0-21swapper/007:54:220
849399895,14cyclictest0-21swapper/010:47:060
849399894,34cyclictest0-21swapper/010:40:000
849399894,32cyclictest0-21swapper/009:37:490
849399894,26cyclictest0-21swapper/008:58:510
849399893,32cyclictest0-21swapper/007:45:440
849399893,32cyclictest0-21swapper/007:45:440
8493998929,13cyclictest0-21swapper/010:52:030
8493998923,14cyclictest0-21swapper/008:22:230
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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