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2026-05-11 - 04:12

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 Mon May 11, 2026 00:44:40)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
6725382262182,65sleep30-21swapper/319:09:333
6724712250182,22sleep10-21swapper/119:08:361
6724862240166,23sleep70-21swapper/719:08:507
6723642238201,24sleep60-21swapper/619:07:046
6724882227162,20sleep00-21swapper/019:08:510
6723032224187,25sleep40-21swapper/419:06:134
6723452223187,24sleep50-21swapper/519:06:475
6723012217184,22sleep20-21swapper/219:06:112
672833992723,3cyclictest767907-21ls21:49:597
672833992622,4cyclictest0-21swapper/723:15:137
67282199260,25cyclictest779707-21idleruntime-cro22:10:003
672827992521,3cyclictest718172-21chrt20:25:125
67282799250,24cyclictest0-21swapper/522:25:135
67282599250,24cyclictest0-21swapper/421:00:194
672821992523,1cyclictest0-21swapper/323:50:203
672812992521,3cyclictest741316-21awk21:05:001
672810992521,3cyclictest809240-21awk23:00:010
67283399240,24cyclictest773828-21awk22:00:007
67283399240,23cyclictest857856-21apt-get00:20:127
67283399240,0cyclictest0-21swapper/720:45:137
67283199240,23cyclictest732479-21perf20:50:006
67283199240,23cyclictest0-21swapper/619:40:006
672821992422,1cyclictest0-21swapper/322:00:003
67282199240,23cyclictest759032-21munin-run21:35:003
67282199240,1cyclictest830443-21apt-get23:35:143
672816992423,1cyclictest819901-21ntpq23:15:192
672812992423,1cyclictest761955-21cron21:40:001
672812992420,3cyclictest838866-21idleruntime-cro23:50:001
672812992419,4cyclictest688236-21awk19:35:011
67281099240,2cyclictest785602-21munin-run22:20:010
672833992322,1cyclictest760823-21ntpq21:35:197
67283399230,23cyclictest0-21swapper/721:50:127
67283399230,23cyclictest0-21swapper/721:50:127
67283399230,22cyclictest0-21swapper/700:09:597
67283399230,0cyclictest0-21swapper/700:00:117
672831992321,1cyclictest806696-21apt-get22:55:126
672831992321,1cyclictest791rcuc/600:00:006
672831992321,1cyclictest0-21swapper/600:25:136
67283199230,22cyclictest764926-21apt-get21:45:036
67283199230,22cyclictest0-21swapper/622:20:216
67283199230,22cyclictest0-21swapper/622:15:126
67283199230,22cyclictest0-21swapper/600:04:596
672827992321,1cyclictest815525-21apt-config23:10:015
672827992320,3cyclictest726613-21sendmail20:40:005
67282799230,23cyclictest732468-21turbostat20:49:595
67282799230,0cyclictest0-21swapper/522:40:155
67282599230,2cyclictest850758-21appstreamcli00:10:024
67282599230,22cyclictest0-21swapper/420:00:134
672821992323,0cyclictest0-21swapper/300:10:023
672821992321,1cyclictest673138-21apt-get19:10:113
67282199230,22cyclictest818602-21apt-get23:15:133
67282199230,22cyclictest800815-21apt-get22:45:123
67282199230,22cyclictest0-21swapper/323:55:023
67282199230,22cyclictest0-21swapper/323:30:123
67282199230,22cyclictest0-21swapper/322:25:123
67282199230,22cyclictest0-21swapper/321:05:133
67281699230,23cyclictest700471-21apt-get19:55:122
67281699230,22cyclictest688646-21apt-get19:35:132
67281699230,22cyclictest0-21swapper/222:30:132
67281699230,22cyclictest0-21swapper/221:55:132
67281699230,22cyclictest0-21swapper/221:45:032
67281299230,22cyclictest780137-21apt-get22:10:121
67281299230,22cyclictest0-21swapper/122:45:121
67281299230,22cyclictest0-21swapper/119:20:111
67281299230,0cyclictest0-21swapper/123:25:101
672810992323,0cyclictest0-21swapper/000:05:120
672810992322,1cyclictest0-21swapper/023:00:130
67281099230,22cyclictest840566-21ntpq23:50:190
67281099230,22cyclictest694118-21apt19:45:010
67281099230,22cyclictest0-21swapper/020:35:120
67281099230,22cyclictest0-21swapper/019:50:160
672833992221,1cyclictest783079-21apt-get22:15:137
672833992221,1cyclictest0-21swapper/723:35:147
672833992218,4cyclictest735415-21munin-run20:55:007
672833992218,4cyclictest0-21swapper/723:25:037
67283399220,22cyclictest837710-21ntp_states23:45:207
67283399220,22cyclictest765119-21cat21:45:017
67283399220,22cyclictest765119-21cat21:45:017
67283399220,22cyclictest747188-21apt21:15:007
67283399220,22cyclictest744255-21munin-run21:10:007
67283399220,22cyclictest0-21swapper/719:15:127
67283399220,22cyclictest0-21swapper/700:25:137
67283399220,21cyclictest0-21swapper/722:35:127
672831992220,1cyclictest824160-21appstreamcli23:25:026
672831992220,1cyclictest0-21swapper/623:10:016
672831992220,1cyclictest0-21swapper/622:00:136
672831992220,1cyclictest0-21swapper/621:50:126
672831992220,1cyclictest0-21swapper/621:50:126
672831992220,1cyclictest0-21swapper/621:10:006
672831992220,1cyclictest0-21swapper/600:20:126
672831992219,2cyclictest866314-21awk00:35:006
67283199220,21cyclictest0-21swapper/623:35:146
67283199220,21cyclictest0-21swapper/623:20:136
67283199220,21cyclictest0-21swapper/623:15:036
67283199220,21cyclictest0-21swapper/623:00:126
67283199220,21cyclictest0-21swapper/622:25:136
67283199220,21cyclictest0-21swapper/620:40:116
67283199220,21cyclictest0-21swapper/620:10:116
67283199220,21cyclictest0-21swapper/619:20:116
67283199220,21cyclictest0-21swapper/619:10:126
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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