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2025-12-19 - 08:01

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 Fri Dec 19, 2025 00:43:55)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
22812993270,324cyclictest9652-21kworker/u16:0+efi_rts_wq22:35:143
223362322315,5sleep30-21swapper/319:07:173
222912318303,5sleep00-21swapper/019:06:430
223572317311,4sleep20-21swapper/219:07:332
223392315309,4sleep10-21swapper/119:07:201
22810993140,313cyclictest16147-21kworker/u16:1+efi_rts_wq23:00:461
22812993130,312cyclictest16147-21kworker/u16:1+efi_rts_wq00:15:143
22812993130,312cyclictest16147-21kworker/u16:1+efi_rts_wq00:15:143
22810993130,312cyclictest22818-21kworker/u16:1+efi_rts_wq19:25:051
22812993110,310cyclictest27634-21kworker/u16:4+efi_rts_wq20:40:143
22812993110,310cyclictest22074-21kworker/u16:2+efi_rts_wq21:00:133
22812993110,310cyclictest19717-21kworker/u16:0+efi_rts_wq21:05:143
22811993110,310cyclictest27634-21kworker/u16:4+efi_rts_wq20:05:132
22809993100,309cyclictest3448-21kworker/u16:1+efi_rts_wq20:00:130
22811993070,306cyclictest22818-21kworker/u16:1+efi_rts_wq19:25:142
22810993060,305cyclictest19717-21kworker/u16:0+efi_rts_wq21:25:271
22809993060,305cyclictest3760-21kworker/u16:3+efi_rts_wq21:20:140
22809993060,305cyclictest32021-21kworker/u16:1+efi_rts_wq20:55:230
22809993060,305cyclictest24606-21kworker/u16:1+efi_rts_wq22:15:120
22812993050,304cyclictest28922-21kworker/u16:0+efi_rts_wq22:10:133
22811993050,303cyclictest4299-21kworker/u16:3+efi_rts_wq00:00:152
22810993040,303cyclictest11113-21kworker/u16:3+efi_rts_wq19:50:101
22811993030,302cyclictest15423-21kworker/u16:2+efi_rts_wq20:15:142
22812993020,301cyclictest4299-21kworker/u16:3+efi_rts_wq00:35:133
22810993020,301cyclictest4299-21kworker/u16:3+efi_rts_wq00:05:171
22810993010,300cyclictest24606-21kworker/u16:1+efi_rts_wq22:25:131
22809992990,298cyclictest22074-21kworker/u16:2+efi_rts_wq21:25:140
22812992980,297cyclictest22074-21kworker/u16:2+efi_rts_wq22:20:133
22811992980,297cyclictest4299-21kworker/u16:3+efi_rts_wq00:05:172
22809992980,297cyclictest22074-21kworker/u16:2+efi_rts_wq21:30:290
22812992970,296cyclictest30686-21kworker/u16:2+efi_rts_wq00:25:123
22810992970,296cyclictest3448-21kworker/u16:1+efi_rts_wq19:55:141
22810992960,295cyclictest22074-21kworker/u16:2+efi_rts_wq23:20:141
22810992960,294cyclictest11113-21kworker/u16:3+efi_rts_wq19:15:021
22811992950,294cyclictest22074-21kworker/u16:2+efi_rts_wq21:35:292
22811992940,293cyclictest16147-21kworker/u16:1+efi_rts_wq23:30:132
22809992940,293cyclictest3448-21kworker/u16:1+efi_rts_wq19:55:110
22810992930,292cyclictest22074-21kworker/u16:2+efi_rts_wq21:35:151
22811992920,291cyclictest22818-21kworker/u16:1+efi_rts_wq19:15:122
22811992920,291cyclictest16147-21kworker/u16:1+efi_rts_wq23:05:142
22809992920,291cyclictest24606-21kworker/u16:1+efi_rts_wq21:50:140
22810992900,289cyclictest20704-21kworker/u16:3+efi_rts_wq22:50:441
22811992870,286cyclictest32021-21kworker/u16:1+efi_rts_wq20:55:142
22811992870,286cyclictest19717-21kworker/u16:0+efi_rts_wq20:20:162
22809992870,284cyclictest19717-21kworker/u16:0+efi_rts_wq20:35:140
22810992860,285cyclictest22074-21kworker/u16:2+efi_rts_wq22:20:381
22812992850,283cyclictest22074-21kworker/u16:2+efi_rts_wq22:40:143
22809992850,284cyclictest28922-21kworker/u16:0+efi_rts_wq22:10:140
22812992840,283cyclictest16147-21kworker/u16:1+efi_rts_wq23:25:133
22811992830,282cyclictest22074-21kworker/u16:2+efi_rts_wq21:30:142
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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