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2026-07-04 - 16:24

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 Sat Jul 04, 2026 12:43:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
239769910013,23cyclictest0-21swapper/009:15:580
23976999826,10cyclictest107550irq/46-eth008:50:360
23976999826,10cyclictest107550irq/46-eth008:50:360
23976999821,13cyclictest0-21swapper/011:25:440
2397699965,27cyclictest0-21swapper/009:23:490
2397699965,27cyclictest0-21swapper/006:45:550
2397699955,27cyclictest0-21swapper/008:03:350
2397699954,9cyclictest27641-21grep12:00:480
2397699947,14cyclictest3516-21munin-node10:36:060
2397699945,13cyclictest0-21swapper/009:35:480
2397699944,41cyclictest0-21swapper/010:15:300
2397699944,41cyclictest0-21swapper/010:15:300
2397699944,27cyclictest0-21swapper/010:15:480
2397899933,20cyclictest0-21swapper/109:36:471
2397699935,26cyclictest0-21swapper/011:58:210
2397699935,23cyclictest374-21perl11:20:500
2397699934,13cyclictest0-21swapper/011:31:020
23978999228,44cyclictest277281rm11:13:041
2397699929,25cyclictest0-21swapper/008:24:390
2397699925,27cyclictest0-21swapper/010:35:280
2397699925,27cyclictest0-21swapper/006:36:140
2397699925,27cyclictest0-21swapper/006:36:140
2397699925,25cyclictest0-21swapper/009:13:170
2397699924,27cyclictest0-21swapper/011:50:450
23978999120,7cyclictest167121diskmemload09:45:321
2397899912,71cyclictest26538-21latency_hist12:00:291
2397699916,24cyclictest23788-21munin-node10:20:570
2397699914,26cyclictest0-21swapper/010:29:110
2397699914,25cyclictest0-21swapper/008:00:390
2397699914,12cyclictest0-21swapper/011:41:340
2397699914,12cyclictest0-21swapper/010:05:540
2397699914,12cyclictest0-21swapper/010:05:540
23976999120,13cyclictest0-21swapper/011:48:190
144522910,6sleep20-21swapper/207:21:042
144522910,6sleep20-21swapper/207:21:042
23978999023,50cyclictest0-21swapper/111:37:491
23978999023,50cyclictest0-21swapper/111:37:491
23978999020,9cyclictest3126-21runrttasks11:25:361
2397699905,27cyclictest0-21swapper/008:55:470
2397699904,26cyclictest0-21swapper/010:53:090
2397699904,26cyclictest0-21swapper/010:53:090
2397699903,9cyclictest107550irq/46-eth010:49:540
2397899894,25cyclictest0-21swapper/111:30:491
2397899893,26cyclictest0-21swapper/108:00:521
23978998926,41cyclictest12686-21expr10:50:511
23978998926,41cyclictest12686-21expr10:50:511
23978998917,8cyclictest20529-21aten2.4-expect10:15:441
2397699898,25cyclictest0-21swapper/009:26:540
2397699898,25cyclictest0-21swapper/009:26:540
2397699896,11cyclictest23987-21unixbench-2d09:31:080
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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