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2026-05-09 - 01:44

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 Fri May 08, 2026 12:44:41)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
25946492263179,18sleep40-21swapper/407:06:364
25948652238171,20sleep70-21swapper/707:09:447
25948142237168,22sleep30-21swapper/307:09:003
25947902237169,22sleep60-21swapper/607:08:396
25946642225161,20sleep10-21swapper/107:06:481
25947662221189,21sleep00-21swapper/007:08:160
25946862221183,25sleep50-21swapper/507:07:095
25947302218184,22sleep20-21swapper/207:07:462
259513399260,24cyclictest2731487-21sendmail11:00:006
2595133992523,1cyclictest0-21swapper/608:20:186
259513099250,24cyclictest2634098-21munin-plugin-st08:15:005
2595128992524,1cyclictest2640426-21apt-get08:25:124
2595128992521,3cyclictest2749160-21basename11:29:594
259512699250,25cyclictest0-21swapper/308:00:103
2595121992522,2cyclictest2675411-21munin-run09:25:011
2595121992522,2cyclictest2675411-21munin-run09:25:001
259512199250,24cyclictest2634101-21perf08:15:001
2595135992423,1cyclictest0-21swapper/711:15:117
259513399240,23cyclictest2704887-21awk10:15:006
2595130992423,1cyclictest0-21swapper/512:10:005
259513099240,23cyclictest2688970-21ntpq09:45:175
2595128992419,4cyclictest2715470-21awk10:30:184
2595126992424,0cyclictest0-21swapper/309:20:133
2595126992424,0cyclictest0-21swapper/309:20:133
2595126992419,4cyclictest2737348-21turbostat11:10:003
259512699240,23cyclictest0-21swapper/312:05:013
2595122992422,1cyclictest0-21swapper/209:30:112
259512299240,24cyclictest2596800-21ntpq07:10:172
259512199240,24cyclictest2691868-21ntpq09:50:161
2595118992423,1cyclictest0-21swapper/011:40:130
2595118992420,3cyclictest2766829-21ls12:00:000
2595135992323,0cyclictest0-21swapper/708:20:187
2595135992321,1cyclictest0-21swapper/708:20:007
259513599230,22cyclictest2723015-21apt-get10:45:107
259513599230,22cyclictest2595422-21apt-get07:10:117
259513599230,22cyclictest0-21swapper/712:20:107
259513599230,22cyclictest0-21swapper/711:10:117
259513599230,22cyclictest0-21swapper/710:10:117
259513599230,22cyclictest0-21swapper/708:45:127
259513599230,1cyclictest2743685-21apt-get11:20:127
259513599230,1cyclictest0-21swapper/712:10:087
2595133992321,1cyclictest2764310-21apt-get11:55:116
2595133992321,1cyclictest2757994-21munin-run11:45:006
259513399230,23cyclictest0-21swapper/610:20:186
259513399230,22cyclictest0-21swapper/607:15:116
2595130992323,0cyclictest0-21swapper/508:00:105
2595130992322,1cyclictest2784953-21apt-get12:30:115
259513099230,23cyclictest2635898-21ntpq08:15:205
259513099230,22cyclictest2649275-21apt-get08:40:115
259513099230,22cyclictest0-21swapper/511:00:125
259513099230,22cyclictest0-21swapper/509:35:125
259512899230,22cyclictest0-21swapper/410:00:134
259512899230,22cyclictest0-21swapper/408:20:114
259512899230,1cyclictest2672897-21apt-get09:20:124
259512899230,1cyclictest2672897-21apt-get09:20:124
2595126992323,0cyclictest0-21swapper/311:10:113
259512699230,23cyclictest2746194-21idleruntime-cro11:25:003
259512699230,22cyclictest2658145-21apt-get08:55:113
259512699230,22cyclictest0-21swapper/309:30:113
2595122992323,0cyclictest0-21swapper/210:50:122
2595122992323,0cyclictest0-21swapper/209:45:122
2595122992322,1cyclictest2655201-21apt-get08:50:112
259512299230,22cyclictest2777372-21ntpq12:15:172
259512299230,22cyclictest0-21swapper/209:50:102
259512299230,22cyclictest0-21swapper/208:15:122
259512299230,1cyclictest0-21swapper/210:20:012
2595121992321,1cyclictest2728934-21apt-get10:55:131
2595121992321,1cyclictest0-21swapper/112:30:111
259512199230,22cyclictest2766825-21turbostat12:00:001
259512199230,22cyclictest0-21swapper/111:20:111
259512199230,22cyclictest0-21swapper/110:50:171
259512199230,22cyclictest0-21swapper/109:40:111
259512199230,1cyclictest2649275-21apt-get08:40:131
259512199230,1cyclictest0-21swapper/110:10:111
2595118992323,0cyclictest0-21swapper/011:45:130
2595118992321,2cyclictest17-21ksoftirqd/007:55:000
259511899230,23cyclictest0-21swapper/008:40:120
259511899230,22cyclictest0-21swapper/012:10:140
259511899230,22cyclictest0-21swapper/010:15:100
259511899230,22cyclictest0-21swapper/009:40:170
259511899230,22cyclictest0-21swapper/009:20:130
259511899230,22cyclictest0-21swapper/009:20:120
259511899230,1cyclictest0-21swapper/011:19:590
2595135992222,0cyclictest0-21swapper/711:05:117
2595135992222,0cyclictest0-21swapper/707:30:137
2595135992221,1cyclictest2731895-21apt-get11:00:137
2595135992221,1cyclictest2602088-21apt-get07:20:117
2595135992221,1cyclictest0-21swapper/710:40:117
2595135992221,1cyclictest0-21swapper/710:35:117
2595135992221,1cyclictest0-21swapper/708:55:117
2595135992221,1cyclictest0-21swapper/708:30:117
2595135992220,1cyclictest2661104-21apt-get09:00:107
259513599220,22cyclictest0-21swapper/711:00:007
259513599220,22cyclictest0-21swapper/709:10:007
259513599220,21cyclictest2712492-21ntpq10:25:177
259513599220,21cyclictest0-21swapper/712:35:177
259513599220,21cyclictest0-21swapper/712:00:127
259513599220,21cyclictest0-21swapper/709:40:117
259513599220,21cyclictest0-21swapper/709:15:127
259513599220,21cyclictest0-21swapper/708:35:127
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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