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2025-12-10 - 05:31

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 Wed Dec 10, 2025 00:43:54)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
108822322315,5sleep00-21swapper/019:05:400
109992320305,5sleep10-21swapper/119:07:081
109122319305,5sleep30-21swapper/319:06:023
109012314306,5sleep20-21swapper/219:05:532
11490993010,300cyclictest6621-21kworker/u16:0+efi_rts_wq22:29:472
11488993010,300cyclictest6621-21kworker/u16:0+efi_rts_wq22:45:120
11490993000,298cyclictest18011-21kworker/u16:1+efi_rts_wq23:10:162
11491992990,298cyclictest31324-21kworker/u16:2+efi_rts_wq22:04:433
11489992990,298cyclictest7321-21kworker/u16:3+efi_rts_wq19:35:141
11491992980,297cyclictest8422-21kworker/u16:0+efi_rts_wq00:20:083
11490992970,296cyclictest31324-21kworker/u16:2+efi_rts_wq20:25:162
11490992970,296cyclictest18011-21kworker/u16:1+efi_rts_wq23:29:592
11488992950,294cyclictest18011-21kworker/u16:1+efi_rts_wq23:35:140
11491992940,293cyclictest10327-21kworker/u16:1+efi_rts_wq22:54:523
11490992940,293cyclictest31324-21kworker/u16:2+efi_rts_wq22:00:142
11491992930,291cyclictest31324-21kworker/u16:2+efi_rts_wq21:15:143
11491992930,291cyclictest31324-21kworker/u16:2+efi_rts_wq21:15:143
11490992930,292cyclictest7321-21kworker/u16:3+efi_rts_wq19:35:132
11488992930,292cyclictest4366-21kworker/u16:4+efi_rts_wq23:55:150
11489992920,291cyclictest31324-21kworker/u16:2+efi_rts_wq19:45:141
11490992910,290cyclictest31324-21kworker/u16:2+efi_rts_wq20:40:132
11491992890,288cyclictest7321-21kworker/u16:3+efi_rts_wq19:30:133
11489992880,287cyclictest31324-21kworker/u16:2+efi_rts_wq22:09:431
11490992850,284cyclictest18011-21kworker/u16:1+efi_rts_wq23:40:012
11489992850,284cyclictest31324-21kworker/u16:2+efi_rts_wq20:29:251
11490992840,283cyclictest7321-21kworker/u16:3+efi_rts_wq19:19:122
11489992840,283cyclictest4366-21kworker/u16:4+efi_rts_wq00:30:131
11489992840,283cyclictest31324-21kworker/u16:2+efi_rts_wq19:20:121
11488992840,283cyclictest4366-21kworker/u16:4+efi_rts_wq00:00:130
11490992830,282cyclictest31324-21kworker/u16:2+efi_rts_wq21:45:132
11490992810,280cyclictest6621-21kworker/u16:0+efi_rts_wq22:19:452
11489992790,278cyclictest7321-21kworker/u16:3+efi_rts_wq19:40:111
11491992770,276cyclictest31324-21kworker/u16:2+efi_rts_wq20:49:293
11489992770,276cyclictest31324-21kworker/u16:2+efi_rts_wq21:29:371
11491992760,275cyclictest31324-21kworker/u16:2+efi_rts_wq20:25:153
11489992750,274cyclictest18011-21kworker/u16:1+efi_rts_wq23:35:001
11489992750,273cyclictest31324-21kworker/u16:2+efi_rts_wq19:10:131
11491992740,273cyclictest6621-21kworker/u16:0+efi_rts_wq20:35:133
11491992740,273cyclictest31324-21kworker/u16:2+efi_rts_wq21:20:133
11491992740,271cyclictest6621-21kworker/u16:0+efi_rts_wq23:15:133
11490992730,272cyclictest31324-21kworker/u16:2+efi_rts_wq19:45:142
11489992730,272cyclictest7321-21kworker/u16:3+efi_rts_wq19:50:131
11489992720,271cyclictest4366-21kworker/u16:4+efi_rts_wq23:50:131
11489992720,271cyclictest31324-21kworker/u16:2+efi_rts_wq23:00:141
11491992710,270cyclictest31324-21kworker/u16:2+efi_rts_wq22:15:133
11490992710,270cyclictest6621-21kworker/u16:0+efi_rts_wq23:20:152
11490992710,269cyclictest6621-21kworker/u16:0+efi_rts_wq23:15:132
11491992700,269cyclictest31324-21kworker/u16:2+efi_rts_wq20:05:143
11489992700,269cyclictest8422-21kworker/u16:0+efi_rts_wq00:35:141
11489992700,269cyclictest4366-21kworker/u16:4+efi_rts_wq00:15:131
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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