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2026-05-02 - 19:00

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 12:43:53)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
311152326319,5sleep10-21swapper/107:06:311
311432318304,5sleep30-21swapper/307:06:533
310472318304,5sleep00-21swapper/007:05:370
311162314307,5sleep20-21swapper/207:06:322
31656993040,302cyclictest1973-21kworker/u16:2+efi_rts_wq11:28:172
31657993000,299cyclictest7352-21kworker/u16:0+efi_rts_wq08:50:133
31656992990,298cyclictest20860-21kworker/u16:4+efi_rts_wq11:55:132
31655992980,297cyclictest31033-21kworker/u16:3+efi_rts_wq08:10:141
31655992980,297cyclictest24222-21kworker/u16:3+efi_rts_wq10:55:111
31657992970,296cyclictest31953-21kworker/u16:1+efi_rts_wq12:35:143
31657992940,293cyclictest9140-21kworker/u16:0+efi_rts_wq11:15:123
31657992940,293cyclictest16349-21kworker/u16:2+efi_rts_wq10:05:123
31657992930,291cyclictest18573-21kworker/u16:0+efi_rts_wq11:50:133
31654992930,292cyclictest24222-21kworker/u16:3+efi_rts_wq10:50:130
31657992920,291cyclictest18742-21kworker/u16:1+efi_rts_wq10:15:123
31656992920,291cyclictest901-21kworker/u16:2+efi_rts_wq07:40:142
31656992910,290cyclictest18742-21kworker/u16:1+efi_rts_wq09:55:112
31656992910,290cyclictest18573-21kworker/u16:0+efi_rts_wq12:30:132
31657992900,289cyclictest5551-21kworker/u16:0+efi_rts_wq07:10:123
31656992900,289cyclictest31033-21kworker/u16:3+efi_rts_wq09:00:132
31655992900,289cyclictest18742-21kworker/u16:1+efi_rts_wq10:33:071
31654992900,289cyclictest7352-21kworker/u16:0+efi_rts_wq08:42:460
31657992880,287cyclictest901-21kworker/u16:2+efi_rts_wq07:15:133
31657992880,287cyclictest18742-21kworker/u16:1+efi_rts_wq09:35:143
31657992860,285cyclictest16349-21kworker/u16:2+efi_rts_wq10:25:143
31654992840,283cyclictest31953-21kworker/u16:1+efi_rts_wq12:23:250
31657992830,282cyclictest16349-21kworker/u16:2+efi_rts_wq09:45:133
31655992820,281cyclictest24222-21kworker/u16:3+efi_rts_wq11:00:131
31657992810,280cyclictest16349-21kworker/u16:2+efi_rts_wq09:30:133
31656992810,280cyclictest901-21kworker/u16:2+efi_rts_wq07:22:322
31657992800,279cyclictest31953-21kworker/u16:1+efi_rts_wq12:28:263
31657992800,278cyclictest9140-21kworker/u16:0+efi_rts_wq11:20:133
31656992800,279cyclictest1973-21kworker/u16:2+efi_rts_wq11:10:122
31654992800,279cyclictest7352-21kworker/u16:0+efi_rts_wq08:55:130
31657992790,278cyclictest16299-21kworker/u16:3+efi_rts_wq11:35:123
31657992780,277cyclictest16349-21kworker/u16:2+efi_rts_wq10:45:143
31656992780,277cyclictest20860-21kworker/u16:4+efi_rts_wq11:43:192
31656992760,275cyclictest20860-21kworker/u16:4+efi_rts_wq12:10:122
31655992750,274cyclictest31033-21kworker/u16:3+efi_rts_wq08:40:121
31654992750,274cyclictest31033-21kworker/u16:3+efi_rts_wq08:27:440
31657992740,272cyclictest18573-21kworker/u16:0+efi_rts_wq11:45:133
31656992740,273cyclictest18742-21kworker/u16:1+efi_rts_wq10:40:112
31657992730,272cyclictest7352-21kworker/u16:0+efi_rts_wq08:55:133
31657992730,271cyclictest31033-21kworker/u16:3+efi_rts_wq08:10:133
31655992710,270cyclictest31033-21kworker/u16:3+efi_rts_wq07:50:131
31654992710,270cyclictest20860-21kworker/u16:4+efi_rts_wq12:05:130
31657992670,266cyclictest18573-21kworker/u16:0+efi_rts_wq11:40:143
31655992650,264cyclictest901-21kworker/u16:2+efi_rts_wq08:00:131
31656992640,263cyclictest901-21kworker/u16:2+efi_rts_wq07:25:132
31655992630,262cyclictest18573-21kworker/u16:0+efi_rts_wq11:58:221
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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