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2025-09-18 - 15:17

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #8, 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 100 highest latencies:
System rack8slot4s.osadl.org (updated Thu Sep 18, 2025 12:44:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
38436412229170,18sleep60-21swapper/607:06:596
38437862222163,19sleep20-21swapper/207:09:032
38437212218180,25sleep30-21swapper/307:08:073
38437182217180,24sleep00-21swapper/007:08:050
38437802215161,18sleep50-21swapper/507:08:595
38437372211175,23sleep10-21swapper/107:08:221
38437162210175,22sleep70-21swapper/707:08:047
38437592208175,21sleep40-21swapper/407:08:404
384406899270,1cyclictest3876235-21basename08:04:590
384409399269,4cyclictest0-21swapper/710:18:317
384409399269,4cyclictest0-21swapper/709:56:337
3844068992621,5cyclictest0-21swapper/008:20:000
384409199250,24cyclictest0-21swapper/609:45:106
384408499250,1cyclictest3948645-21apt-get10:10:094
384407399250,24cyclictest3985654-21awk11:15:012
384406899250,21cyclictest0-21swapper/011:25:010
3844093992423,1cyclictest3919815-21apt-get09:20:127
384407999240,0cyclictest0-21swapper/307:50:123
3844073992422,1cyclictest0-21swapper/208:20:002
384407399240,0cyclictest0-21swapper/208:55:122
3844068992420,4cyclictest0-21swapper/012:20:000
3844093992322,1cyclictest0-21swapper/712:15:117
3844093992321,1cyclictest4006089-21apt-get11:50:127
384409399230,22cyclictest0-21swapper/708:15:127
384409199230,22cyclictest3956817-21perf10:25:006
384409199230,22cyclictest0-21swapper/607:35:016
384408799230,2cyclictest3905055-21awk08:55:005
384408799230,22cyclictest3971516-21apt-get10:50:105
3844084992323,0cyclictest0-21swapper/410:30:114
3844084992321,1cyclictest0-21swapper/407:40:114
384408499230,22cyclictest3905048-21munin-run08:54:594
384408499230,22cyclictest0-21swapper/407:15:014
384407999230,23cyclictest4034288-21sendmail-msp12:40:003
384407999230,22cyclictest3919815-21apt-get09:20:113
384407999230,22cyclictest0-21swapper/308:15:123
3844073992321,1cyclictest3928374-21apt-get09:35:152
384407399230,22cyclictest4014671-21apt-get12:05:152
384407399230,22cyclictest3913667-21munin-run09:10:002
384407399230,22cyclictest3865207-21apt-get07:45:132
384407399230,22cyclictest0-21swapper/208:35:132
3844071992321,1cyclictest3985651-21perf11:15:011
384407199230,22cyclictest3959667-21munin-run10:30:001
384407199230,22cyclictest3953941-21munin-run10:20:001
384407199230,22cyclictest3916537-21awk09:15:001
384406899230,22cyclictest0-21swapper/008:40:120
384406899230,22cyclictest0-21swapper/007:55:160
384409399229,0cyclictest0-21swapper/708:50:407
3844093992221,1cyclictest0-21swapper/710:30:137
384409399220,22cyclictest0-21swapper/711:00:017
384409399220,22cyclictest0-21swapper/709:09:367
384409399220,22cyclictest0-21swapper/707:25:007
384409399220,21cyclictest0-21swapper/711:30:127
384409399220,21cyclictest0-21swapper/708:20:147
3844091992219,2cyclictest3919369-21turbostat09:20:006
384409199220,21cyclictest0-21swapper/612:15:126
384409199220,21cyclictest0-21swapper/611:05:126
384409199220,1cyclictest3988945-21apt-get11:20:136
384409199220,1cyclictest3884785-21basename08:19:596
384409199220,1cyclictest0-21swapper/612:25:006
384409199220,1cyclictest0-21swapper/611:00:016
384409199220,1cyclictest0-21swapper/609:09:376
3844087992220,1cyclictest4005676-21perf11:50:015
384408799220,21cyclictest3999853-21updatedb.plocat11:39:105
384408799220,21cyclictest3905468-21apt-get08:55:135
384408799220,21cyclictest0-21swapper/510:35:135
384408799220,21cyclictest0-21swapper/509:05:135
384408799220,21cyclictest0-21swapper/508:25:105
384408799220,21cyclictest0-21swapper/507:10:125
384408799220,1cyclictest671rcuc/509:20:005
384408799220,1cyclictest4022813-21munin-run12:20:015
384408799220,1cyclictest0-21swapper/509:04:595
384408499220,21cyclictest4011816-21apt-get12:00:114
384408499220,21cyclictest0-21swapper/411:39:104
384408499220,21cyclictest0-21swapper/410:55:164
384408499220,21cyclictest0-21swapper/410:50:104
384408499220,21cyclictest0-21swapper/410:25:134
384408499220,21cyclictest0-21swapper/409:45:094
384408499220,21cyclictest0-21swapper/409:00:114
384408499220,21cyclictest0-21swapper/408:10:124
384408499220,21cyclictest0-21swapper/407:35:114
384408499220,21cyclictest0-21swapper/407:15:124
384408499220,1cyclictest3899768-21apt-get08:45:134
384408499220,1cyclictest0-21swapper/408:00:134
3844079992221,1cyclictest0-21swapper/311:40:013
384407999220,22cyclictest0-21swapper/308:04:593
384407999220,21cyclictest0-21swapper/312:00:123
384407999220,21cyclictest0-21swapper/309:35:143
384407999220,21cyclictest0-21swapper/309:05:143
384407999220,21cyclictest0-21swapper/307:25:173
384407999220,1cyclictest0-21swapper/311:10:133
384407999220,1cyclictest0-21swapper/309:15:153
384407999220,1cyclictest0-21swapper/309:00:113
384407999220,1cyclictest0-21swapper/308:30:123
384407399220,22cyclictest3919376-21munin-run09:20:002
384407399220,21cyclictest4011374-21turbostat12:00:012
384407399220,21cyclictest3991800-21apt-get11:25:162
384407399220,21cyclictest0-21swapper/209:30:162
384407399220,21cyclictest0-21swapper/207:15:112
384407399220,1cyclictest0-21swapper/210:30:132
3844071992222,0cyclictest0-21swapper/108:35:121
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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