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2026-05-02 - 06:45

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 May 02, 2026 00:43:53)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
64272329307,5sleep20-21swapper/219:07:582
47432317303,4sleep30-21swapper/319:05:033
62422314308,4sleep00-21swapper/019:05:350
64332313306,5sleep10-21swapper/119:08:011
6963993030,299cyclictest14385-21kworker/u16:1+efi_rts_wq22:35:123
6961993010,300cyclictest14385-21kworker/u16:1+efi_rts_wq00:05:182
6961993000,299cyclictest25461-21kworker/u16:0+efi_rts_wq21:55:112
6961993000,299cyclictest25461-21kworker/u16:0+efi_rts_wq21:55:112
6956992990,297cyclictest6872-21kworker/u16:2+efi_rts_wq23:05:110
6963992980,297cyclictest17063-21kworker/u16:3+efi_rts_wq23:20:123
6961992980,297cyclictest14385-21kworker/u16:1+efi_rts_wq23:30:112
6960992980,297cyclictest14385-21kworker/u16:1+efi_rts_wq23:45:131
6963992970,296cyclictest16731-21kworker/u16:3+efi_rts_wq22:20:133
6960992960,295cyclictest6416-21kworker/u16:1+efi_rts_wq19:45:181
6963992930,292cyclictest27559-21kworker/u16:4+efi_rts_wq21:50:123
6963992930,292cyclictest27559-21kworker/u16:4+efi_rts_wq21:50:113
6963992930,292cyclictest14385-21kworker/u16:1+efi_rts_wq23:04:523
6963992920,291cyclictest17063-21kworker/u16:3+efi_rts_wq00:30:113
6956992920,291cyclictest16731-21kworker/u16:3+efi_rts_wq22:05:110
6960992900,289cyclictest16731-21kworker/u16:3+efi_rts_wq22:50:101
6956992900,289cyclictest6872-21kworker/u16:2+efi_rts_wq23:24:550
6963992890,288cyclictest6416-21kworker/u16:1+efi_rts_wq19:35:123
6963992880,287cyclictest6416-21kworker/u16:1+efi_rts_wq19:30:113
6960992850,284cyclictest6872-21kworker/u16:2+efi_rts_wq22:59:511
6956992850,284cyclictest25461-21kworker/u16:0+efi_rts_wq21:45:110
6956992850,284cyclictest16731-21kworker/u16:3+efi_rts_wq22:20:110
6963992840,283cyclictest17063-21kworker/u16:3+efi_rts_wq00:25:113
6956992840,282cyclictest4287-21kworker/u16:2+efi_rts_wq21:05:120
6963992830,282cyclictest4287-21kworker/u16:2+efi_rts_wq19:20:093
6963992830,282cyclictest27559-21kworker/u16:4+efi_rts_wq21:40:113
6963992830,282cyclictest17063-21kworker/u16:3+efi_rts_wq00:15:133
6961992820,281cyclictest16731-21kworker/u16:3+efi_rts_wq22:15:112
6956992820,281cyclictest14385-21kworker/u16:1+efi_rts_wq23:35:110
6956992820,281cyclictest14385-21kworker/u16:1+efi_rts_wq22:50:100
6961992810,280cyclictest4287-21kworker/u16:2+efi_rts_wq19:10:122
6961992800,279cyclictest6416-21kworker/u16:1+efi_rts_wq19:55:122
6963992790,278cyclictest6416-21kworker/u16:1+efi_rts_wq20:15:113
6956992790,278cyclictest4287-21kworker/u16:2+efi_rts_wq20:29:230
6956992790,278cyclictest14385-21kworker/u16:1+efi_rts_wq23:15:140
6963992780,277cyclictest14385-21kworker/u16:1+efi_rts_wq23:35:123
6960992780,277cyclictest14385-21kworker/u16:1+efi_rts_wq22:25:111
6960992770,276cyclictest6416-21kworker/u16:1+efi_rts_wq20:30:111
6956992770,276cyclictest6416-21kworker/u16:1+efi_rts_wq20:50:100
6961992760,275cyclictest4287-21kworker/u16:2+efi_rts_wq20:05:122
6963992740,273cyclictest14385-21kworker/u16:1+efi_rts_wq23:30:123
6961992730,272cyclictest6416-21kworker/u16:1+efi_rts_wq19:35:122
6956992720,271cyclictest6416-21kworker/u16:1+efi_rts_wq20:40:150
6956992720,271cyclictest4287-21kworker/u16:2+efi_rts_wq19:25:110
6961992710,270cyclictest6416-21kworker/u16:1+efi_rts_wq21:10:112
6961992700,269cyclictest6416-21kworker/u16:1+efi_rts_wq20:40:152
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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