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2026-01-11 - 09:27

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 Sun Jan 11, 2026 00:43:55)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
134762319311,5sleep20-21swapper/219:07:282
135302316302,5sleep10-21swapper/119:08:131
134182315307,5sleep30-21swapper/319:06:453
13936993140,311cyclictest1923-21kworker/u16:1+efi_rts_wq22:55:120
134202314306,5sleep00-21swapper/019:06:470
13937993130,312cyclictest19154-21kworker/u16:3+efi_rts_wq19:25:131
13936993130,312cyclictest19154-21kworker/u16:3+efi_rts_wq21:30:130
13937993120,311cyclictest1923-21kworker/u16:1+efi_rts_wq22:05:111
13936993120,311cyclictest8356-21kworker/u16:0+efi_rts_wq19:50:110
13937993110,310cyclictest7103-21kworker/u16:2+efi_rts_wq00:15:121
13937993110,310cyclictest7103-21kworker/u16:2+efi_rts_wq00:05:141
13939993100,309cyclictest19154-21kworker/u16:3+efi_rts_wq21:15:123
13938993090,308cyclictest20733-21kworker/u16:2+efi_rts_wq23:15:122
13937993090,308cyclictest19154-21kworker/u16:3+efi_rts_wq20:30:001
13937993090,308cyclictest13867-21kworker/u16:1+efi_rts_wq00:25:131
13939993080,307cyclictest21662-21kworker/u16:2+efi_rts_wq22:35:193
13939993070,306cyclictest18106-21kworker/u16:0+efi_rts_wq23:35:103
13937993070,306cyclictest8356-21kworker/u16:0+efi_rts_wq20:24:591
13939993060,305cyclictest18106-21kworker/u16:0+efi_rts_wq00:00:133
13937993060,305cyclictest13867-21kworker/u16:1+efi_rts_wq00:35:131
13937993030,302cyclictest21662-21kworker/u16:2+efi_rts_wq22:45:121
13939993020,301cyclictest19154-21kworker/u16:3+efi_rts_wq20:15:143
13936993020,301cyclictest20733-21kworker/u16:2+efi_rts_wq23:25:120
13938993010,300cyclictest19154-21kworker/u16:3+efi_rts_wq19:19:462
13938992990,298cyclictest8356-21kworker/u16:0+efi_rts_wq20:40:122
13939992980,297cyclictest13867-21kworker/u16:1+efi_rts_wq00:10:393
13936992980,295cyclictest19154-21kworker/u16:3+efi_rts_wq19:15:110
13937992960,295cyclictest1923-21kworker/u16:1+efi_rts_wq22:15:121
13936992960,295cyclictest1923-21kworker/u16:1+efi_rts_wq22:20:190
13936992960,295cyclictest19154-21kworker/u16:3+efi_rts_wq20:30:130
13937992950,294cyclictest8356-21kworker/u16:0+efi_rts_wq20:50:051
13938992940,293cyclictest8356-21kworker/u16:0+efi_rts_wq20:20:132
13936992930,292cyclictest13867-21kworker/u16:1+efi_rts_wq00:20:120
13938992920,291cyclictest21662-21kworker/u16:2+efi_rts_wq22:40:142
13937992910,290cyclictest8356-21kworker/u16:0+efi_rts_wq19:50:111
13937992910,290cyclictest19154-21kworker/u16:3+efi_rts_wq19:40:131
13937992910,290cyclictest19154-21kworker/u16:3+efi_rts_wq19:39:511
13936992910,290cyclictest30184-21kworker/u16:1+efi_rts_wq23:30:120
13938992900,289cyclictest19154-21kworker/u16:3+efi_rts_wq21:45:132
13939992890,288cyclictest8356-21kworker/u16:0+efi_rts_wq20:00:143
13937992890,288cyclictest18106-21kworker/u16:0+efi_rts_wq23:20:131
13937992870,286cyclictest8356-21kworker/u16:0+efi_rts_wq20:35:131
13936992870,286cyclictest18106-21kworker/u16:0+efi_rts_wq23:40:340
13937992850,284cyclictest12764-21kworker/u16:3+efi_rts_wq23:00:271
13936992850,284cyclictest1923-21kworker/u16:1+efi_rts_wq22:45:130
13936992840,283cyclictest1923-21kworker/u16:1+efi_rts_wq22:15:130
13936992830,282cyclictest19154-21kworker/u16:3+efi_rts_wq21:05:130
13936992830,282cyclictest19154-21kworker/u16:3+efi_rts_wq20:25:130
13936992820,281cyclictest18106-21kworker/u16:0+efi_rts_wq23:55:380
13936992820,281cyclictest18106-21kworker/u16:0+efi_rts_wq23:50:110
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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