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2026-04-11 - 20:28

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #9, slot #4

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 rack9slot4s (updated Sat Apr 11, 2026 12:59:02)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
225629911751125,39cyclictest23246-21idleruntime07:25:190
225639910901079,8cyclictest0-21swapper/107:25:171
224702538487,31sleep10-21swapper/107:24:381
224512467370,29sleep00-21swapper/007:24:240
751521320,6sleep02256299cyclictest09:52:040
319821130,5sleep13156-21fschecks_time12:35:171
86772730,5sleep0111rcuc/012:40:270
4232570,8sleep02256299cyclictest11:59:260
22562995023,11cyclictest3-21ksoftirqd/010:23:360
22562994823,13cyclictest3-21ksoftirqd/011:49:120
131042450,7sleep12256399cyclictest12:11:361
22562994423,5cyclictest3-21ksoftirqd/009:22:310
22562994323,4cyclictest3-21ksoftirqd/012:03:010
22562994322,5cyclictest3-21ksoftirqd/010:08:180
154442430,4sleep1211ktimersoftd/110:34:261
22562994224,8cyclictest3-21ksoftirqd/011:53:060
22562994224,8cyclictest3-21ksoftirqd/009:41:490
22562994125,5cyclictest3-21ksoftirqd/011:05:390
22562994122,4cyclictest3-21ksoftirqd/010:55:070
2256299411,11cyclictest0-21swapper/011:11:560
156402411,4sleep015652-21rm10:34:440
2256399405,32cyclictest0-21swapper/110:46:561
2256399401,12cyclictest31688-21ssh09:44:151
22562994024,5cyclictest3-21ksoftirqd/011:18:590
22562994024,5cyclictest3-21ksoftirqd/009:49:030
22562994023,5cyclictest3-21ksoftirqd/012:18:220
22562994022,6cyclictest3-21ksoftirqd/012:46:240
2256299401,35cyclictest0-21swapper/012:50:360
6252397,5sleep0636-21ssh10:19:090
2256399396,29cyclictest0-21swapper/110:02:161
2256399393,33cyclictest16016-21sh11:40:581
22563993917,15cyclictest2214-21iostat_ios10:20:201
22562993924,5cyclictest3-21ksoftirqd/010:48:270
22562993924,5cyclictest3-21ksoftirqd/010:37:400
22562993924,5cyclictest3-21ksoftirqd/009:25:470
22562993924,5cyclictest3-21ksoftirqd/009:17:500
22562993923,5cyclictest3-21ksoftirqd/007:54:590
22562993922,6cyclictest3-21ksoftirqd/008:22:400
22562993922,5cyclictest3-21ksoftirqd/011:00:210
22562993918,5cyclictest3-21ksoftirqd/009:55:360
22562993915,4cyclictest0-21swapper/011:36:010
2256399381,7cyclictest30241-21ssh11:55:361
2256299384,5cyclictest0-21swapper/011:43:560
22562993823,5cyclictest3-21ksoftirqd/009:37:140
279492370,3sleep0111rcuc/009:00:270
22563993728,5cyclictest4883-21df11:30:151
2256399371,6cyclictest7946-21ssh12:40:151
2256399371,5cyclictest27021-21ssh11:52:551
2256299373,8cyclictest0-21swapper/012:36:000
22562993722,5cyclictest3-21ksoftirqd/010:13:130
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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