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2026-04-12 - 23:16

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 Sun Apr 12, 2026 12:44:46)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
24669242231170,20sleep50-21swapper/507:06:025
24669242231170,20sleep50-21swapper/507:06:025
24671072229167,20sleep20-21swapper/207:08:402
24671072229167,20sleep20-21swapper/207:08:402
24671352220187,21sleep30-21swapper/307:09:053
24671352220187,21sleep30-21swapper/307:09:053
24669292219181,24sleep10-21swapper/107:06:071
24669292219181,24sleep10-21swapper/107:06:061
24669632216184,20sleep60-21swapper/607:06:366
24669632216184,20sleep60-21swapper/607:06:356
24671322215185,19sleep00-21swapper/007:09:030
24671322215185,19sleep00-21swapper/007:09:020
24671002213180,21sleep40-21swapper/407:08:344
24671002213180,21sleep40-21swapper/407:08:344
24671392212178,22sleep70-21swapper/707:09:107
24671392212178,22sleep70-21swapper/707:09:097
25041782860,0sleep20-21swapper/208:10:132
2467615992821,6cyclictest0-21swapper/411:55:004
246761599280,5cyclictest690-21gdbus10:20:004
246761599270,26cyclictest0-21swapper/409:15:124
246761999260,25cyclictest0-21swapper/512:05:015
246761999260,25cyclictest0-21swapper/512:05:005
246761299260,3cyclictest2656393-21turbostat.cron12:35:013
246762799250,24cyclictest0-21swapper/711:15:127
2467615992523,1cyclictest0-21swapper/409:00:134
246761599250,4cyclictest2624876-21apt-get11:40:124
246761599250,2cyclictest0-21swapper/411:15:134
246762799247,4cyclictest0-21swapper/709:18:017
246762799241,2cyclictest0-21swapper/707:45:007
2467619992419,4cyclictest0-21swapper/510:25:165
246761999240,23cyclictest0-21swapper/511:45:115
246761999240,23cyclictest0-21swapper/508:05:125
246761999240,21cyclictest0-21swapper/511:20:015
246761999240,1cyclictest0-21swapper/508:10:135
246761999240,0cyclictest0-21swapper/510:20:135
246761999240,0cyclictest0-21swapper/508:50:115
2467615992421,2cyclictest0-21swapper/410:50:134
246761599240,23cyclictest0-21swapper/411:20:114
246761599240,23cyclictest0-21swapper/411:05:094
246761599240,23cyclictest0-21swapper/407:20:014
246760899240,23cyclictest2500805-21munin-run08:05:002
2467627992322,0cyclictest0-21swapper/711:40:127
2467627992321,1cyclictest0-21swapper/708:45:127
246762799230,22cyclictest2567039-21perf10:00:007
246762799230,22cyclictest0-21swapper/711:25:007
246762599230,2cyclictest2530046-21apt08:55:126
246762599230,23cyclictest2470714-21wc07:15:016
246761999230,22cyclictest2491957-21apt-get07:50:015
246761999230,22cyclictest0-21swapper/508:40:135
246761999230,22cyclictest0-21swapper/508:25:125
246761999230,0cyclictest0-21swapper/510:35:135
2467615992319,3cyclictest0-21swapper/408:25:124
246761599230,2cyclictest0-21swapper/411:45:124
246761599230,22cyclictest0-21swapper/409:55:114
246761599230,22cyclictest0-21swapper/407:40:124
2467612992321,1cyclictest2506922-21apt-get08:15:113
2467612992321,1cyclictest2495495-21apt-get07:55:113
246761299231,1cyclictest0-21swapper/310:40:003
246761299230,22cyclictest2578899-21apt-get10:20:123
246761299230,22cyclictest2549900-21munin-run09:30:003
246761299230,0cyclictest0-21swapper/307:50:023
246760899230,22cyclictest0-21swapper/212:15:112
2467606992323,0cyclictest0-21swapper/109:30:111
246760699230,22cyclictest2503655-21munin-run08:10:001
246760699230,22cyclictest0-21swapper/112:05:111
2467627992222,0cyclictest0-21swapper/707:20:007
2467627992220,1cyclictest2569898-21turbostat10:05:007
2467627992218,3cyclictest2633001-21idleruntime-cro11:55:007
246762799220,21cyclictest0-21swapper/711:45:117
246762799220,21cyclictest0-21swapper/711:30:107
246762799220,21cyclictest0-21swapper/711:15:007
246762799220,21cyclictest0-21swapper/710:20:127
246762799220,21cyclictest0-21swapper/710:05:117
246762799220,21cyclictest0-21swapper/708:20:127
246762799220,21cyclictest0-21swapper/707:45:127
246762799220,1cyclictest2535774-21apt-get09:05:137
246762799220,1cyclictest0-21swapper/710:35:147
2467625992221,1cyclictest2651114-21apt-get12:25:106
2467625992220,1cyclictest2636307-21apt-get12:00:156
2467625992220,1cyclictest2636307-21apt-get12:00:156
246762599220,22cyclictest0-21swapper/607:20:006
246762599220,21cyclictest2624422-21sh11:40:016
246762599220,21cyclictest2610309-21apt-get11:15:126
246762599220,21cyclictest2570319-21apt-get10:05:116
246762599220,21cyclictest2498370-21apt-get08:00:126
246762599220,21cyclictest0-21swapper/610:40:126
246762599220,21cyclictest0-21swapper/610:35:126
246762599220,21cyclictest0-21swapper/609:30:116
246762599220,21cyclictest0-21swapper/607:45:136
2467619992220,2cyclictest0-21swapper/507:15:115
2467619992220,1cyclictest2622006-21apt-get11:35:135
2467619992220,1cyclictest2575605-21munin-run10:15:005
2467619992220,1cyclictest2567469-21apt-get10:00:115
246761999220,21cyclictest2624876-21apt-get11:40:125
246761999220,21cyclictest0-21swapper/511:20:115
246761999220,21cyclictest0-21swapper/511:05:095
246761999220,1cyclictest2598882-21apt-get10:55:115
2467615992220,2cyclictest0-21swapper/408:10:124
2467615992219,3cyclictest0-21swapper/409:50:114
2467615992218,3cyclictest2521043-21idleruntime-cro08:40:004
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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