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2026-05-19 - 03:40

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 May 19, 2026 00:43:55)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
43142337316,4sleep30-21swapper/319:09:433
43272335311,22sleep10-21swapper/119:09:531
41122331306,23sleep00-21swapper/019:07:080
40812316310,4sleep20-21swapper/219:06:462
4603993050,302cyclictest17370-21kworker/u16:1+efi_rts_wq21:00:151
4604992970,296cyclictest17370-21kworker/u16:1+efi_rts_wq20:40:122
4604992970,295cyclictest26047-21kworker/u16:2+efi_rts_wq23:25:122
4605992960,295cyclictest3630-21kworker/u16:3+efi_rts_wq21:10:123
4605992960,295cyclictest17370-21kworker/u16:1+efi_rts_wq22:00:143
4604992950,294cyclictest25379-21kworker/u16:0+efi_rts_wq20:00:112
4605992940,293cyclictest17370-21kworker/u16:1+efi_rts_wq23:05:193
4604992930,292cyclictest17370-21kworker/u16:1+efi_rts_wq22:45:122
4603992920,291cyclictest20712-21kworker/u16:0+efi_rts_wq23:55:101
4603992910,290cyclictest26047-21kworker/u16:2+efi_rts_wq23:30:241
4604992900,289cyclictest17370-21kworker/u16:1+efi_rts_wq20:50:122
4604992900,289cyclictest13571-21kworker/u16:1+efi_rts_wq23:30:132
4602992900,289cyclictest17370-21kworker/u16:1+efi_rts_wq22:30:140
4603992890,288cyclictest2145-21kworker/u16:3+efi_rts_wq00:30:331
4605992870,286cyclictest3630-21kworker/u16:3+efi_rts_wq21:30:123
4604992870,286cyclictest17370-21kworker/u16:1+efi_rts_wq21:00:152
4603992860,285cyclictest17370-21kworker/u16:1+efi_rts_wq22:45:121
4602992860,285cyclictest17370-21kworker/u16:1+efi_rts_wq20:15:110
4604992850,284cyclictest25379-21kworker/u16:0+efi_rts_wq20:25:122
4602992840,283cyclictest17370-21kworker/u16:1+efi_rts_wq21:05:130
4604992830,282cyclictest26047-21kworker/u16:2+efi_rts_wq00:00:292
4604992830,282cyclictest17370-21kworker/u16:1+efi_rts_wq21:10:132
4603992830,282cyclictest26047-21kworker/u16:2+efi_rts_wq23:40:121
4604992820,281cyclictest20712-21kworker/u16:0+efi_rts_wq23:45:152
4604992810,280cyclictest17370-21kworker/u16:1+efi_rts_wq20:20:092
4604992800,279cyclictest17370-21kworker/u16:1+efi_rts_wq22:25:122
4602992790,278cyclictest13234-21kworker/u16:3+efi_rts_wq19:49:430
4604992780,277cyclictest17370-21kworker/u16:1+efi_rts_wq21:35:032
4602992780,277cyclictest17370-21kworker/u16:1+efi_rts_wq20:04:470
4605992760,275cyclictest3630-21kworker/u16:3+efi_rts_wq22:35:133
4605992760,273cyclictest25379-21kworker/u16:0+efi_rts_wq20:00:113
4602992750,274cyclictest26047-21kworker/u16:2+efi_rts_wq23:00:140
4603992740,273cyclictest26047-21kworker/u16:2+efi_rts_wq00:10:131
4605992730,272cyclictest3630-21kworker/u16:3+efi_rts_wq20:40:123
4605992700,269cyclictest25379-21kworker/u16:0+efi_rts_wq20:05:133
4604992690,268cyclictest13234-21kworker/u16:3+efi_rts_wq19:55:142
4602992690,267cyclictest17370-21kworker/u16:1+efi_rts_wq22:05:120
4604992680,267cyclictest26047-21kworker/u16:2+efi_rts_wq23:20:222
4604992680,267cyclictest17370-21kworker/u16:1+efi_rts_wq22:55:132
4602992680,267cyclictest20712-21kworker/u16:0+efi_rts_wq23:50:130
4602992680,266cyclictest26047-21kworker/u16:2+efi_rts_wq23:20:130
4603992670,266cyclictest26047-21kworker/u16:2+efi_rts_wq22:50:121
4602992670,266cyclictest3630-21kworker/u16:3+efi_rts_wq22:10:130
4605992650,264cyclictest528-21kworker/u16:2+efi_rts_wq19:14:373
4603992650,264cyclictest26047-21kworker/u16:2+efi_rts_wq23:20:141
4605992630,262cyclictest3630-21kworker/u16:3+efi_rts_wq21:20:013
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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