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2026-01-09 - 17:21

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 Jan 09, 2026 12:44:44)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
38808582257185,24sleep50-21swapper/507:07:415
38810002224194,19sleep40-21swapper/407:09:394
38809332222167,17sleep60-21swapper/607:08:466
38810072219187,20sleep20-21swapper/207:09:472
38810082215177,24sleep30-21swapper/307:09:483
38808622215182,21sleep00-21swapper/007:07:440
38808272215181,21sleep10-21swapper/107:07:121
38807302212177,22sleep70-21swapper/707:05:507
39748442560,0sleep70-21swapper/709:50:127
39561402540,0sleep6761rcuc/609:15:216
39557512490,0sleep20-21swapper/209:15:172
3881258992524,0cyclictest0-21swapper/309:10:003
388125599250,1cyclictest0-21swapper/212:15:012
388126999240,23cyclictest0-21swapper/707:45:117
388126399240,24cyclictest0-21swapper/509:55:005
388126399240,24cyclictest0-21swapper/507:54:595
3881261992422,1cyclictest3983071-21apt-get10:05:104
3881255992421,2cyclictest3927607-21awk08:30:002
388125599240,23cyclictest3928011-21apt-get08:30:102
388125299240,23cyclictest4049556-21apt-get12:00:101
3881248992422,1cyclictest4058108-21apt-get12:15:110
3881248992421,2cyclictest363-21systemd-journal09:34:590
388124899240,23cyclictest3936443-21awk08:44:590
388124899240,23cyclictest3902312-21apt-get07:45:100
3881269992321,1cyclictest3888007-21apt-get07:20:107
3881269992321,1cyclictest0-21swapper/712:20:017
3881269992321,1cyclictest0-21swapper/711:20:017
388126999230,22cyclictest4029557-21apt-get11:25:127
388126999230,22cyclictest4020311-21perf11:10:007
388126999230,22cyclictest4008619-21munin-run10:50:017
3881267992323,0cyclictest0-21swapper/607:55:136
3881267992322,1cyclictest3950970-21munin-run09:09:596
3881267992321,1cyclictest0-21swapper/608:50:106
388126799230,23cyclictest363-21systemd-journal09:54:596
3881263992321,1cyclictest4049556-21apt-get12:00:115
388126399230,22cyclictest3982655-21munin-run10:04:595
3881261992321,1cyclictest4052405-21apt-get12:05:114
3881261992320,2cyclictest3907611-21idleruntime-cro07:54:594
388126199230,1cyclictest0-21swapper/412:20:114
3881258992323,0cyclictest0-21swapper/308:50:093
3881258992323,0cyclictest0-21swapper/307:55:123
3881255992322,1cyclictest0-21swapper/211:25:012
3881255992321,1cyclictest4038135-21apt-get11:40:122
388125599230,23cyclictest3916187-21awk08:10:002
3881252992322,1cyclictest0-21swapper/108:10:111
388125299230,22cyclictest4032408-21apt-get11:30:111
388125299230,22cyclictest4017874-21apt-get11:05:131
388125299230,22cyclictest0-21swapper/111:50:111
388125299230,22cyclictest0-21swapper/107:50:121
3881248992321,1cyclictest3939273-21apt-get08:50:010
3881248992321,1cyclictest3890867-21apt-get07:25:120
3881248992321,1cyclictest0-21swapper/010:00:100
388124899230,22cyclictest4017194-21awk11:05:010
388124899230,22cyclictest0-21swapper/007:20:100
3881269992220,1cyclictest4003074-21apt-get10:40:117
3881269992220,1cyclictest3965509-21munin-run09:35:007
388126999220,21cyclictest4066688-21apt-get12:30:127
388126999220,21cyclictest3948536-21apt-get09:05:127
388126999220,21cyclictest0-21swapper/712:20:127
388126999220,21cyclictest0-21swapper/708:05:107
3881267992221,1cyclictest0-21swapper/608:00:126
3881267992220,2cyclictest3999798-21basename10:35:006
388126799220,22cyclictest0-21swapper/612:05:096
388126799220,21cyclictest0-21swapper/612:30:136
388126799220,21cyclictest0-21swapper/610:40:116
388126799220,0cyclictest0-21swapper/608:40:006
3881263992222,0cyclictest0-21swapper/509:45:105
3881263992221,1cyclictest0-21swapper/508:40:005
3881263992221,1cyclictest0-21swapper/508:10:115
3881263992220,1cyclictest4052405-21apt-get12:05:095
388126399220,22cyclictest3896159-21perf07:35:015
388126399220,21cyclictest0-21swapper/511:00:115
3881261992221,1cyclictest0-21swapper/410:15:114
3881261992220,1cyclictest3968799-21apt-get09:40:114
388126199220,21cyclictest3899463-21apt-get07:40:114
388126199220,21cyclictest0-21swapper/412:15:104
388126199220,21cyclictest0-21swapper/411:20:124
388126199220,1cyclictest3971648-21apt-get09:45:104
388126199220,1cyclictest0-21swapper/409:30:004
388126199220,1cyclictest0-21swapper/407:25:014
3881258992222,0cyclictest0-21swapper/309:50:123
3881258992222,0cyclictest0-21swapper/308:15:123
3881258992220,1cyclictest3907598-21munin-run07:55:003
388125899220,22cyclictest0-21swapper/311:05:133
388125899220,22cyclictest0-21swapper/309:30:123
388125899220,22cyclictest0-21swapper/308:35:093
388125899220,1cyclictest51-21ksoftirqd/307:30:013
388125899220,1cyclictest0-21swapper/312:30:133
388125899220,1cyclictest0-21swapper/310:40:123
388125899220,0cyclictest0-21swapper/311:00:113
3881255992221,1cyclictest3974499-21apt-get09:50:112
3881255992221,1cyclictest0-21swapper/211:45:112
3881255992221,1cyclictest0-21swapper/208:00:102
3881255992221,1cyclictest0-21swapper/207:20:332
3881255992220,1cyclictest3905165-21apt-get07:50:112
388125599220,22cyclictest3951649-21apt-get09:10:112
388125599220,22cyclictest0-21swapper/209:30:002
388125599220,21cyclictest0-21swapper/212:20:012
388125599220,21cyclictest0-21swapper/210:40:122
388125599220,21cyclictest0-21swapper/207:40:122
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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