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2025-11-13 - 03:35

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, slot #3

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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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 rack3slot3s.osadl.org (updated Thu Nov 13, 2025 00:43:58)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
78919212859,64sleep30-21swapper/319:09:313
7875628757,9sleep20-21swapper/219:07:262
7894928156,19sleep00-21swapper/019:09:520
7885427855,10sleep10-21swapper/119:08:411
3605542302,8sleep0360602-21ntpq22:40:200
79078992926,1cyclictest0-21swapper/322:40:013
79078992825,2cyclictest0-21swapper/323:50:013
79078992724,1cyclictest0-21swapper/323:28:493
79078992623,1cyclictest0-21swapper/320:40:003
79078992623,1cyclictest0-21swapper/320:40:003
79078992622,2cyclictest0-21swapper/321:40:003
79078992621,2cyclictest0-21swapper/322:46:003
79078992615,8cyclictest0-21swapper/300:37:253
3009452264,10sleep1302234-21cut22:05:171
79078992521,2cyclictest0-21swapper/323:50:163
79078992422,1cyclictest0-21swapper/300:15:203
79078992421,1cyclictest0-21swapper/322:10:143
79078992421,1cyclictest0-21swapper/322:09:183
79078992420,2cyclictest0-21swapper/323:00:213
79078992420,2cyclictest0-21swapper/322:43:233
79078992420,2cyclictest0-21swapper/322:02:143
79078992420,2cyclictest0-21swapper/321:48:073
79078992414,8cyclictest0-21swapper/321:15:013
79078992413,8cyclictest0-21swapper/321:16:363
79078992410,2cyclictest0-21swapper/300:22:253
79078992410,2cyclictest0-21swapper/300:22:243
79078992320,1cyclictest0-21swapper/321:00:013
7907899231,9cyclictest378497-21taskset22:51:573
79078992319,2cyclictest0-21swapper/322:27:533
79078992319,2cyclictest0-21swapper/320:40:213
79078992313,8cyclictest0-21swapper/321:40:223
7907899228,11cyclictest0-21swapper/322:18:543
7907899228,11cyclictest0-21swapper/300:10:193
79078992220,1cyclictest0-21swapper/321:31:583
79078992220,1cyclictest0-21swapper/320:10:003
79078992219,1cyclictest0-21swapper/319:38:223
79078992218,2cyclictest0-21swapper/322:21:433
79078992218,2cyclictest0-21swapper/321:29:003
79078992218,2cyclictest0-21swapper/300:30:213
79078992217,2cyclictest0-21swapper/323:24:583
79078992216,2cyclictest0-21swapper/300:01:143
79078992212,7cyclictest0-21swapper/323:13:343
7907899221,17cyclictest386887-21taskset22:57:303
7907899220,13cyclictest228-1kworker/3:1H+kblockd23:55:263
7907899218,5cyclictest541ktimers/321:20:373
7907899217,11cyclictest0-21swapper/300:09:243
79078992118,1cyclictest0-21swapper/323:35:293
79078992118,1cyclictest0-21swapper/323:05:133
79078992117,2cyclictest0-21swapper/323:30:253
79078992117,2cyclictest0-21swapper/323:30:253
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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