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2026-01-12 - 11:02

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 Mon Jan 12, 2026 00:43:54)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
99742321314,5sleep30-21swapper/319:06:073
99392320313,5sleep20-21swapper/219:05:422
102312317310,5sleep10-21swapper/119:09:251
101102317309,5sleep00-21swapper/019:07:510
10541993160,315cyclictest26834-21kworker/u16:2+efi_rts_wq21:55:120
10543993140,312cyclictest11052-21kworker/u16:1+efi_rts_wq20:30:122
10541993130,311cyclictest17996-21kworker/u16:0+efi_rts_wq23:30:130
10542993100,309cyclictest7787-21kworker/u16:4+efi_rts_wq22:55:121
10544993090,308cyclictest7188-21kworker/u16:0+efi_rts_wq21:40:133
10544993090,308cyclictest11052-21kworker/u16:1+efi_rts_wq20:00:133
10542993080,307cyclictest17996-21kworker/u16:0+efi_rts_wq23:50:121
10543993070,306cyclictest7188-21kworker/u16:0+efi_rts_wq21:50:112
10541993070,306cyclictest12658-21kworker/u16:3+efi_rts_wq19:20:130
10542993060,305cyclictest7188-21kworker/u16:0+efi_rts_wq21:40:121
10543993050,303cyclictest17996-21kworker/u16:0+efi_rts_wq23:45:132
10542993050,304cyclictest12658-21kworker/u16:3+efi_rts_wq19:14:161
10541993050,304cyclictest29557-21kworker/u16:3+efi_rts_wq21:25:120
10541993040,303cyclictest11052-21kworker/u16:1+efi_rts_wq20:35:130
10544993030,302cyclictest7188-21kworker/u16:0+efi_rts_wq21:45:123
10544993020,301cyclictest29557-21kworker/u16:3+efi_rts_wq22:35:153
10544993010,298cyclictest11052-21kworker/u16:1+efi_rts_wq20:50:123
10542993010,300cyclictest7508-21kworker/u16:0+efi_rts_wq20:29:301
10542993000,297cyclictest29557-21kworker/u16:3+efi_rts_wq22:35:161
10542992980,296cyclictest4695-21kworker/u16:2+efi_rts_wq23:05:141
10541992980,297cyclictest26834-21kworker/u16:2+efi_rts_wq21:54:480
10544992970,296cyclictest7787-21kworker/u16:4+efi_rts_wq23:20:123
10543992970,296cyclictest11052-21kworker/u16:1+efi_rts_wq19:40:112
10541992970,296cyclictest17996-21kworker/u16:0+efi_rts_wq23:45:120
10542992960,295cyclictest7787-21kworker/u16:4+efi_rts_wq23:10:111
10542992960,295cyclictest26834-21kworker/u16:2+efi_rts_wq21:35:121
10541992960,295cyclictest7787-21kworker/u16:4+efi_rts_wq23:00:110
10541992950,294cyclictest11052-21kworker/u16:1+efi_rts_wq20:20:120
10542992940,293cyclictest11052-21kworker/u16:1+efi_rts_wq19:25:131
10541992940,293cyclictest12658-21kworker/u16:3+efi_rts_wq19:49:220
10543992920,291cyclictest1858-21kworker/u16:2+efi_rts_wq00:30:152
10543992910,290cyclictest26834-21kworker/u16:2+efi_rts_wq21:59:492
10542992910,290cyclictest4695-21kworker/u16:2+efi_rts_wq23:25:151
10541992910,290cyclictest11052-21kworker/u16:1+efi_rts_wq20:45:120
10541992900,289cyclictest12658-21kworker/u16:3+efi_rts_wq19:15:000
10541992900,289cyclictest11052-21kworker/u16:1+efi_rts_wq20:50:130
10544992890,288cyclictest21432-21kworker/u16:3+efi_rts_wq00:35:123
10543992890,288cyclictest26834-21kworker/u16:2+efi_rts_wq22:00:142
10542992890,288cyclictest11052-21kworker/u16:1+efi_rts_wq19:55:121
10544992880,287cyclictest7508-21kworker/u16:0+efi_rts_wq21:05:123
10544992870,286cyclictest11052-21kworker/u16:1+efi_rts_wq20:40:143
10544992860,285cyclictest29557-21kworker/u16:3+efi_rts_wq22:05:113
10542992850,284cyclictest7787-21kworker/u16:4+efi_rts_wq23:20:121
10541992850,284cyclictest12658-21kworker/u16:3+efi_rts_wq20:15:110
10542992840,283cyclictest12658-21kworker/u16:3+efi_rts_wq20:10:151
10542992830,282cyclictest29557-21kworker/u16:3+efi_rts_wq22:05:121
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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