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2026-07-25 - 03:55

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, slot #3

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 50 highest latencies:
System rackcslot3s.osadl.org (updated Sat Jul 25, 2026 00:43:55)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
135082334307,10sleep30-21swapper/319:09:513
135212326319,5sleep00-21swapper/019:10:010
133582314308,4sleep20-21swapper/219:07:532
132102314306,5sleep10-21swapper/119:06:001
13785993010,300cyclictest14238-21kworker/u16:3+efi_rts_wq20:20:111
13786993000,299cyclictest14238-21kworker/u16:3+efi_rts_wq21:25:132
13785992970,296cyclictest1782-21kworker/u16:2+efi_rts_wq23:45:131
13786992960,295cyclictest15918-21kworker/u16:0+efi_rts_wq21:55:412
13786992960,295cyclictest14238-21kworker/u16:3+efi_rts_wq19:55:132
13784992960,293cyclictest4091-21kworker/u16:3+efi_rts_wq00:30:120
13787992940,291cyclictest1890-21kworker/u16:1+efi_rts_wq19:30:133
13786992940,293cyclictest1890-21kworker/u16:1+efi_rts_wq19:45:122
13784992940,293cyclictest1890-21kworker/u16:1+efi_rts_wq20:40:290
13785992930,292cyclictest14238-21kworker/u16:3+efi_rts_wq21:00:141
13787992920,291cyclictest1782-21kworker/u16:2+efi_rts_wq00:15:113
13786992920,291cyclictest1890-21kworker/u16:1+efi_rts_wq21:50:132
13785992920,291cyclictest14238-21kworker/u16:3+efi_rts_wq20:05:231
13784992920,291cyclictest14238-21kworker/u16:3+efi_rts_wq19:20:100
13784992910,290cyclictest14238-21kworker/u16:3+efi_rts_wq21:00:140
13785992900,289cyclictest1088-21kworker/u16:3+efi_rts_wq22:45:511
13786992890,288cyclictest14238-21kworker/u16:3+efi_rts_wq21:35:372
13785992890,288cyclictest14960-21kworker/u16:3+efi_rts_wq23:05:131
13785992890,288cyclictest14238-21kworker/u16:3+efi_rts_wq20:55:141
13784992890,288cyclictest9815-21kworker/u16:2+efi_rts_wq23:00:120
13786992870,286cyclictest7219-21kworker/u16:0+efi_rts_wq22:50:132
13784992870,286cyclictest14238-21kworker/u16:3+efi_rts_wq20:55:140
13785992860,285cyclictest1890-21kworker/u16:1+efi_rts_wq19:15:131
13786992850,284cyclictest1890-21kworker/u16:1+efi_rts_wq21:10:132
13786992850,284cyclictest1782-21kworker/u16:2+efi_rts_wq23:45:122
13785992840,283cyclictest14960-21kworker/u16:3+efi_rts_wq23:25:121
13786992830,282cyclictest14238-21kworker/u16:3+efi_rts_wq20:05:112
13785992830,280cyclictest14238-21kworker/u16:3+efi_rts_wq20:35:131
13784992810,280cyclictest1782-21kworker/u16:2+efi_rts_wq00:10:130
13785992800,279cyclictest15918-21kworker/u16:0+efi_rts_wq22:25:471
13784992800,279cyclictest1890-21kworker/u16:1+efi_rts_wq20:00:220
13784992790,278cyclictest1890-21kworker/u16:1+efi_rts_wq21:30:130
13784992790,278cyclictest1890-21kworker/u16:1+efi_rts_wq20:25:110
13787992780,277cyclictest29437-21kworker/u16:0+efi_rts_wq23:40:133
13786992780,277cyclictest1890-21kworker/u16:1+efi_rts_wq19:25:132
13784992780,277cyclictest14238-21kworker/u16:3+efi_rts_wq21:15:350
13787992770,276cyclictest1782-21kworker/u16:2+efi_rts_wq00:25:133
13784992770,276cyclictest4091-21kworker/u16:3+efi_rts_wq00:06:030
13787992750,274cyclictest14960-21kworker/u16:3+efi_rts_wq23:05:123
13786992730,272cyclictest20338-21kworker/u16:1+efi_rts_wq23:10:132
13786992730,272cyclictest1890-21kworker/u16:1+efi_rts_wq22:35:102
13784992720,271cyclictest1890-21kworker/u16:1+efi_rts_wq21:20:120
13784992720,270cyclictest1890-21kworker/u16:1+efi_rts_wq22:40:500
13787992700,269cyclictest4091-21kworker/u16:3+efi_rts_wq00:35:143
13785992690,268cyclictest4091-21kworker/u16:3+efi_rts_wq00:35:141
13784992690,268cyclictest15918-21kworker/u16:0+efi_rts_wq22:25:110
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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