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2025-07-10 - 18:57

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, slot #5

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 rack0slot5s.osadl.org (updated Thu Jul 10, 2025 00:47:43)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
29280212362305,18sleep100-21swapper/1019:05:052
29309562356350,4sleep00-21swapper/019:08:090
29280272352325,18sleep150-21swapper/1519:05:107
29310082348322,17sleep120-21swapper/1219:08:544
29308172348321,18sleep60-21swapper/619:06:0612
29310452347322,17sleep130-21swapper/1319:09:265
29308122347321,18sleep10-21swapper/119:06:011
29310052345317,18sleep90-21swapper/919:08:5015
29309532345318,18sleep140-21swapper/1419:08:076
29307762345316,19sleep70-21swapper/719:05:3513
29310012344317,18sleep50-21swapper/519:08:4611
29310792342315,18sleep80-21swapper/819:09:5414
29310532340310,19sleep40-21swapper/419:09:3310
29309412340313,18sleep20-21swapper/219:07:568
29308332340314,18sleep30-21swapper/319:06:209
29307832340315,17sleep110-21swapper/1119:05:393
2931417998521,50cyclictest81-21ksoftirqd/622:18:2412
2931417997612,39cyclictest0-21swapper/623:24:1912
2931417996313,25cyclictest0-21swapper/619:22:4012
2931417996313,25cyclictest0-21swapper/619:22:4012
2931417996212,50cyclictest0-21swapper/622:40:2312
2931417996022,38cyclictest81-21ksoftirqd/619:33:3912
2931417996010,36cyclictest81-21ksoftirqd/600:30:1212
293141799566,25cyclictest0-21swapper/622:07:2512
2931417995519,25cyclictest81-21ksoftirqd/621:56:2612
293141799545,38cyclictest81-21ksoftirqd/623:02:2112
2931417995213,14cyclictest0-21swapper/620:06:3712
2931417995011,39cyclictest0-21swapper/621:34:2912
2931417995011,39cyclictest0-21swapper/621:34:2812
2931417995011,14cyclictest0-21swapper/622:29:2312
293141799500,25cyclictest0-21swapper/621:23:3012
293141799500,25cyclictest0-21swapper/621:23:2912
2931417994911,38cyclictest0-21swapper/619:44:3812
2931417994911,25cyclictest0-21swapper/621:12:3112
2931417994911,25cyclictest0-21swapper/620:39:3412
2931417994911,25cyclictest0-21swapper/600:19:1412
2931417994810,38cyclictest0-21swapper/621:45:2712
2931417994810,38cyclictest0-21swapper/620:28:3512
2931417994810,25cyclictest0-21swapper/621:01:3112
2931417994810,25cyclictest0-21swapper/619:55:3712
293141799460,33cyclictest0-21swapper/623:35:1812
293141799460,33cyclictest0-21swapper/623:35:1712
293141799391,25cyclictest0-21swapper/619:11:4112
293141799380,38cyclictest0-21swapper/622:51:2212
293141799380,25cyclictest0-21swapper/623:46:1712
293141799380,25cyclictest0-21swapper/620:17:3612
2931417993611,14cyclictest0-21swapper/623:13:2012
2931417993611,14cyclictest0-21swapper/620:50:3212
2931417993611,14cyclictest0-21swapper/600:08:1512
2931417993510,14cyclictest0-21swapper/623:57:1612
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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