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2026-09-15 - 15:54

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 Tue Sep 15, 2026 12:43:54)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
49572324318,4sleep00-21swapper/007:06:570
51792320306,5sleep30-21swapper/307:09:493
50042317303,5sleep10-21swapper/107:07:351
50052315308,4sleep20-21swapper/207:07:362
5460993040,301cyclictest18259-21kworker/u16:3+efi_rts_wq09:00:133
5457992980,296cyclictest18259-21kworker/u16:3+efi_rts_wq08:50:140
5459992970,294cyclictest18259-21kworker/u16:3+efi_rts_wq07:45:112
5460992960,295cyclictest29908-21kworker/u16:3+efi_rts_wq11:57:363
5458992950,294cyclictest29740-21kworker/u16:2+efi_rts_wq11:35:131
5459992930,292cyclictest15376-21kworker/u16:0+efi_rts_wq09:10:142
5458992930,292cyclictest30779-21kworker/u16:1+efi_rts_wq07:10:131
5458992930,292cyclictest18259-21kworker/u16:3+efi_rts_wq09:07:071
5460992920,291cyclictest29908-21kworker/u16:3+efi_rts_wq12:00:133
5460992920,291cyclictest18259-21kworker/u16:3+efi_rts_wq09:30:133
5459992920,291cyclictest23715-21kworker/u16:1+efi_rts_wq12:35:132
5458992920,291cyclictest29908-21kworker/u16:3+efi_rts_wq12:20:131
5460992900,289cyclictest24444-21kworker/u16:3+efi_rts_wq10:40:143
5460992900,289cyclictest24444-21kworker/u16:3+efi_rts_wq10:40:133
5458992900,289cyclictest30779-21kworker/u16:1+efi_rts_wq08:25:131
5458992900,289cyclictest18259-21kworker/u16:3+efi_rts_wq09:17:081
5458992900,289cyclictest18259-21kworker/u16:3+efi_rts_wq08:35:151
5457992900,289cyclictest24444-21kworker/u16:3+efi_rts_wq10:40:130
5457992900,289cyclictest24444-21kworker/u16:3+efi_rts_wq10:40:130
5460992890,288cyclictest5780-21kworker/u16:1+efi_rts_wq11:05:133
5459992880,287cyclictest18259-21kworker/u16:3+efi_rts_wq08:30:142
5457992880,287cyclictest18259-21kworker/u16:3+efi_rts_wq09:40:120
5457992880,287cyclictest14260-21kworker/u16:4+efi_rts_wq11:15:130
5457992870,285cyclictest29908-21kworker/u16:3+efi_rts_wq11:55:120
5459992850,284cyclictest5780-21kworker/u16:1+efi_rts_wq10:35:142
5459992850,284cyclictest30779-21kworker/u16:1+efi_rts_wq08:20:152
5458992850,284cyclictest7904-21kworker/u16:0+efi_rts_wq10:15:121
5458992850,284cyclictest4938-21kworker/u16:2+efi_rts_wq07:35:131
5460992840,283cyclictest23715-21kworker/u16:1+efi_rts_wq11:45:143
5457992840,283cyclictest18259-21kworker/u16:3+efi_rts_wq09:05:120
5459992830,282cyclictest23715-21kworker/u16:1+efi_rts_wq12:05:132
5459992830,281cyclictest5780-21kworker/u16:1+efi_rts_wq11:05:132
5459992830,281cyclictest29740-21kworker/u16:2+efi_rts_wq10:45:122
5457992830,282cyclictest24444-21kworker/u16:3+efi_rts_wq10:30:130
5459992820,280cyclictest30779-21kworker/u16:1+efi_rts_wq08:40:132
5458992810,280cyclictest29740-21kworker/u16:2+efi_rts_wq10:45:121
5459992800,279cyclictest17444-21kworker/u16:2+efi_rts_wq09:15:132
5458992800,279cyclictest7904-21kworker/u16:0+efi_rts_wq10:05:121
5460992790,278cyclictest15376-21kworker/u16:0+efi_rts_wq08:55:143
5460992780,277cyclictest29740-21kworker/u16:2+efi_rts_wq11:10:143
5459992770,276cyclictest5780-21kworker/u16:1+efi_rts_wq10:50:132
5458992760,275cyclictest29740-21kworker/u16:2+efi_rts_wq10:50:131
5457992760,275cyclictest18259-21kworker/u16:3+efi_rts_wq07:50:130
5459992740,270cyclictest18259-21kworker/u16:3+efi_rts_wq09:35:142
5457992740,273cyclictest18259-21kworker/u16:3+efi_rts_wq09:47:130
5458992730,272cyclictest29740-21kworker/u16:2+efi_rts_wq11:42:351
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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