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2026-08-05 - 21:43

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 Wed Aug 05, 2026 12:43:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1944699954,36cyclictest0-21swapper/008:14:390
1944699953,85cyclictest0-21swapper/008:20:020
1944999942,22cyclictest1450-21diskmemload09:09:101
1944699935,12cyclictest7545-21iostat_ios11:00:480
19446999217,12cyclictest0-21swapper/009:45:590
1944999904,35cyclictest10680-21gltestperf11:05:441
1944699904,31cyclictest0-21swapper/008:37:070
1944699904,13cyclictest0-21swapper/010:54:020
19446999027,12cyclictest0-21swapper/009:14:400
1944699902,81cyclictest26733-21ssh09:03:220
1944999895,33cyclictest0-21swapper/108:44:461
1944999894,33cyclictest0-21swapper/110:46:261
1944999886,31cyclictest1227-21runrttasks11:10:471
1944999885,26cyclictest0-21swapper/107:34:141
1944999883,37cyclictest23111-21swap09:46:011
1944699884,33cyclictest0-21swapper/008:08:180
1944699883,39cyclictest0-21swapper/009:40:350
1944699883,22cyclictest109011ssh09:28:240
19446998825,15cyclictest0-21swapper/011:10:430
1944999876,32cyclictest6646-21aten2.4-expect11:00:381
1944999874,24cyclictest21012-21runrttasks06:17:431
1944699875,33cyclictest0-21swapper/010:05:450
1944699874,10cyclictest16781-21cstates11:15:380
1944699873,25cyclictest0-21swapper/008:59:340
1944699873,25cyclictest0-21swapper/008:21:160
1944699873,13cyclictest0-21swapper/011:33:590
1944699873,12cyclictest0-21swapper/008:45:530
1944699873,11cyclictest0-21swapper/010:44:590
1944699872,22cyclictest1450-21diskmemload08:53:220
1944999864,10cyclictest7457-21munin-node10:11:031
1944999863,36cyclictest0-21swapper/110:00:441
1944699869,33cyclictest0-21swapper/010:04:210
1944699863,40cyclictest0-21swapper/009:30:560
1944699863,34cyclictest0-21swapper/011:25:240
1944699863,25cyclictest0-21swapper/011:10:090
1944699863,25cyclictest0-21swapper/010:40:030
1944699862,11cyclictest0-21swapper/010:10:430
1944999854,35cyclictest0-21swapper/108:12:351
1944999853,23cyclictest12563-21ssh08:40:221
19449998519,13cyclictest0-21swapper/107:29:131
1944699854,37cyclictest0-21swapper/009:55:460
1944699853,34cyclictest0-21swapper/010:15:560
1944999844,39cyclictest30325-21chrt09:57:061
1944999844,33cyclictest0-21swapper/110:19:081
1944999844,31cyclictest19266-21cpuspeed_turbos10:30:411
1944999844,31cyclictest19266-21cpuspeed_turbos10:30:411
1944999844,10cyclictest1227-21runrttasks11:24:331
1944699845,72cyclictest0-21swapper/008:05:330
1944699844,14cyclictest0-21swapper/010:35:070
1944699844,14cyclictest0-21swapper/010:35:070
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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