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2025-07-12 - 12:49

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, 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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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 rack0slot6s.osadl.org (updated Sat Jul 12, 2025 00:46:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3576584991209,53cyclictest0-21swapper/721:45:0217
3576601998425,58cyclictest0-21swapper/1320:36:455
38866132830,0sleep12265-21kswapd000:22:334
38517982740,0sleep170-21swapper/1723:45:559
3576601997412,61cyclictest0-21swapper/1323:19:225
3576601997412,61cyclictest0-21swapper/1323:19:225
58366620690,1data-loop.00-21swapper/1521:59:047
3576601996817,50cyclictest0-21swapper/1320:45:595
3576574996817,50cyclictest0-21swapper/320:05:2113
3576574996516,48cyclictest0-21swapper/321:11:0613
357657499643,60cyclictest0-21swapper/319:27:0513
3576566996317,45cyclictest3842516-40tracker-miner-f23:40:030
3576601996130,31cyclictest115050irq/18-parport021:24:505
3576574996020,39cyclictest0-21swapper/300:35:5913
3576601995927,32cyclictest0-21swapper/1320:55:335
3576601995927,32cyclictest0-21swapper/1320:55:335
37786882580,0sleep180-21swapper/1822:34:0910
3576601995816,41cyclictest0-21swapper/1321:39:585
3576574995832,25cyclictest0-21swapper/320:33:4713
3576568995831,0cyclictest0-21swapper/122:59:411
3576601995757,0cyclictest0-21swapper/1322:53:505
3576623995656,0cyclictest0-21swapper/1822:11:3210
3576601995655,0cyclictest0-21swapper/1321:58:025
357660199560,0cyclictest0-21swapper/1300:25:315
357657499565,22cyclictest3778523-40tracker-miner-f22:33:2513
357657499563,52cyclictest3529454-21firefox22:44:3213
3576574995628,28cyclictest0-21swapper/321:24:0813
3576601995524,31cyclictest0-21swapper/1320:00:245
3576589995555,0cyclictest0-21swapper/922:11:3219
3576589995554,0cyclictest0-21swapper/919:20:0719
357660199542,51cyclictest0-21swapper/1321:00:595
3576601995331,21cyclictest0-21swapper/1321:44:015
3576601995321,32cyclictest115050irq/18-parport021:26:405
3576601995321,31cyclictest115050irq/18-parport023:53:335
357660199530,52cyclictest115050irq/18-parport023:20:185
357660199530,52cyclictest115050irq/18-parport000:19:495
357660199530,52cyclictest0-21swapper/1322:55:005
357660199530,52cyclictest0-21swapper/1322:49:315
357660199530,52cyclictest0-21swapper/1321:50:445
357660199530,52cyclictest0-21swapper/1320:19:275
357660199530,52cyclictest0-21swapper/1300:07:095
3576574995321,31cyclictest3639422-21kworker/u80:4+i91520:12:4113
357657499531,23cyclictest1337745-21WebExtensions21:58:0313
357657499530,21cyclictest3529488-21Cache213
3576618995251,1cyclictest0-21swapper/1700:01:439
3576601995232,19cyclictest0-21swapper/1323:38:335
3576601995232,19cyclictest0-21swapper/1321:14:435
3576601995232,19cyclictest0-21swapper/1319:13:305
3576601995221,31cyclictest0-21swapper/1323:01:455
3576601995221,30cyclictest115050irq/18-parport019:15:345
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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