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2025-12-08 - 07:56

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 Mon Dec 08, 2025 00:43:58)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2021118211756,56sleep30-21swapper/319:07:313
202109428654,9sleep20-21swapper/219:07:142
202101128560,19sleep10-21swapper/119:06:141
202104828358,19sleep00-21swapper/019:06:410
2021443992722,3cyclictest0-21swapper/323:35:143
202144399262,18cyclictest2466157-21chrt00:25:143
23614402250,3sleep10-21swapper/123:17:011
202144399242,14cyclictest2476294-21taskset00:30:163
202144399242,14cyclictest2215924-21taskset21:50:123
2021443992421,1cyclictest0-21swapper/323:25:223
2021443992420,2cyclictest0-21swapper/323:45:113
202144399240,21cyclictest66550irq/131-enp1s0-TxRx-300:10:243
2021443992319,2cyclictest0-21swapper/321:15:173
202144399231,18cyclictest2263833-21taskset22:19:193
202144399231,18cyclictest2263833-21taskset22:19:183
202144399231,14cyclictest2213979-21taskset21:47:353
23208232221,2sleep20-21swapper/222:53:062
23137142221,5sleep12150347-21diskmemload22:49:401
202144399222,14cyclictest2385488-21taskset23:31:353
202144399222,14cyclictest2190048-21taskset21:33:373
2021443992219,1cyclictest0-21swapper/320:40:183
2021443992219,1cyclictest0-21swapper/320:14:593
2021443992214,4cyclictest21734112sleep321:22:593
202144399221,14cyclictest0-21swapper/322:55:213
24511602211,2sleep10-21swapper/100:15:001
2021443992119,1cyclictest0-21swapper/300:39:593
2021443992118,1cyclictest0-21swapper/322:30:353
2021443992117,3cyclictest0-21swapper/323:05:013
2021443992117,2cyclictest0-21swapper/323:05:283
2021443992117,2cyclictest0-21swapper/320:40:003
2021443992111,6cyclictest66550irq/131-enp1s0-TxRx-323:54:463
202144399210,19cyclictest0-21swapper/323:15:433
23528162201,9sleep12352821-21ssh23:11:091
23196282200,9sleep02319638-21ssh22:51:120
22325252201,14sleep02232718-21tail22:00:160
2021443992017,1cyclictest0-21swapper/322:50:173
2021443992017,1cyclictest0-21swapper/322:30:013
2021443992017,1cyclictest0-21swapper/320:05:263
2021443992016,2cyclictest0-21swapper/322:45:143
2021443992016,2cyclictest0-21swapper/321:10:193
2021443992016,2cyclictest0-21swapper/320:50:003
2021443992016,2cyclictest0-21swapper/300:20:173
2021443992015,2cyclictest0-21swapper/321:26:313
202144399201,16cyclictest0-21swapper/321:58:443
202144399201,15cyclictest0-21swapper/322:35:133
202144399201,14cyclictest0-21swapper/322:05:133
2021443992010,7cyclictest2435653-21taskset00:04:263
202144399200,1cyclictest0-21swapper/322:44:443
23148732191,13sleep12315464-21grep22:50:171
21989302191,2sleep20-21swapper/221:39:532
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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