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2026-01-04 - 17:11

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 04, 2026 12:43:53)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
297502323316,4sleep30-21swapper/307:06:173
299612322310,9sleep10-21swapper/107:08:591
297692320313,5sleep20-21swapper/207:06:322
297252314306,5sleep00-21swapper/007:05:570
30416993120,311cyclictest20612-21kworker/u16:1+efi_rts_wq08:32:233
30416993090,308cyclictest30077-21kworker/u16:1+efi_rts_wq11:05:133
30412993090,308cyclictest20612-21kworker/u16:1+efi_rts_wq08:05:131
30412993090,308cyclictest14821-21kworker/u16:0+efi_rts_wq12:23:071
30412993080,307cyclictest6702-21kworker/u16:2+efi_rts_wq08:45:151
30411993080,307cyclictest6702-21kworker/u16:2+efi_rts_wq08:50:130
30411993070,306cyclictest22468-21kworker/u16:0+efi_rts_wq10:47:490
30414993050,304cyclictest6702-21kworker/u16:2+efi_rts_wq07:15:142
30414993050,304cyclictest30077-21kworker/u16:1+efi_rts_wq11:12:532
30414993030,302cyclictest2462-21kworker/u16:0+efi_rts_wq07:35:142
30411993030,302cyclictest6702-21kworker/u16:2+efi_rts_wq09:35:140
30416993000,299cyclictest24152-21kworker/u16:2+efi_rts_wq12:10:123
30416992990,298cyclictest20612-21kworker/u16:1+efi_rts_wq09:22:333
30416992990,298cyclictest20612-21kworker/u16:1+efi_rts_wq08:57:283
30414992990,298cyclictest2462-21kworker/u16:0+efi_rts_wq07:30:122
30412992990,298cyclictest30077-21kworker/u16:1+efi_rts_wq12:03:031
30411992990,298cyclictest14821-21kworker/u16:0+efi_rts_wq12:25:130
30412992980,297cyclictest27553-21kworker/u16:2+efi_rts_wq11:22:551
30411992970,296cyclictest6702-21kworker/u16:2+efi_rts_wq09:12:310
30411992970,296cyclictest2462-21kworker/u16:0+efi_rts_wq07:35:130
30416992960,295cyclictest20612-21kworker/u16:1+efi_rts_wq09:00:143
30412992960,295cyclictest20612-21kworker/u16:1+efi_rts_wq09:15:131
30412992950,294cyclictest30077-21kworker/u16:1+efi_rts_wq11:30:131
30412992950,294cyclictest20612-21kworker/u16:1+efi_rts_wq10:30:151
30411992950,294cyclictest6702-21kworker/u16:2+efi_rts_wq10:10:130
30411992950,294cyclictest20612-21kworker/u16:1+efi_rts_wq08:37:240
30414992940,293cyclictest27553-21kworker/u16:2+efi_rts_wq11:02:522
30411992940,293cyclictest2462-21kworker/u16:0+efi_rts_wq07:45:140
30414992930,292cyclictest30077-21kworker/u16:1+efi_rts_wq11:25:132
30412992930,292cyclictest6702-21kworker/u16:2+efi_rts_wq08:10:121
30412992930,292cyclictest20612-21kworker/u16:1+efi_rts_wq08:40:121
30411992930,292cyclictest2462-21kworker/u16:0+efi_rts_wq07:27:120
30416992910,290cyclictest20612-21kworker/u16:1+efi_rts_wq09:50:143
30414992910,290cyclictest18371-21kworker/u16:3+efi_rts_wq10:45:132
30412992890,288cyclictest6702-21kworker/u16:2+efi_rts_wq07:25:121
30411992880,287cyclictest30077-21kworker/u16:1+efi_rts_wq12:13:050
30416992870,286cyclictest6702-21kworker/u16:2+efi_rts_wq10:20:143
30411992870,286cyclictest30077-21kworker/u16:1+efi_rts_wq11:50:130
30411992820,281cyclictest30077-21kworker/u16:1+efi_rts_wq11:00:140
30411992820,281cyclictest2462-21kworker/u16:0+efi_rts_wq07:55:160
30414992810,280cyclictest6702-21kworker/u16:2+efi_rts_wq08:15:152
30412992810,280cyclictest6702-21kworker/u16:2+efi_rts_wq07:50:111
30416992800,279cyclictest2462-21kworker/u16:0+efi_rts_wq07:17:103
30414992780,277cyclictest6702-21kworker/u16:2+efi_rts_wq08:25:132
30411992780,277cyclictest6702-21kworker/u16:2+efi_rts_wq09:30:140
30411992770,276cyclictest20612-21kworker/u16:1+efi_rts_wq08:27:220
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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