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2026-05-10 - 15:25

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 May 10, 2026 12:43:54)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
78792317304,4sleep10-21swapper/107:09:011
77792315307,5sleep30-21swapper/307:07:473
77492314307,5sleep00-21swapper/007:07:240
76182314308,4sleep20-21swapper/207:05:422
8219993000,299cyclictest27530-21kworker/u16:0+efi_rts_wq08:05:120
8220992990,298cyclictest9738-21kworker/u16:0+efi_rts_wq08:58:191
8219992990,298cyclictest14997-21kworker/u16:3+efi_rts_wq12:35:120
8219992980,297cyclictest15901-21kworker/u16:2+efi_rts_wq07:15:110
8220992970,296cyclictest26851-21kworker/u16:3+efi_rts_wq09:25:131
8220992970,295cyclictest1798-21kworker/u16:2+efi_rts_wq12:10:101
8222992960,295cyclictest8017-21kworker/u16:1+efi_rts_wq11:03:453
8222992950,294cyclictest18395-21kworker/u16:3+efi_rts_wq11:18:473
8221992950,292cyclictest10500-21kworker/u16:2+efi_rts_wq11:05:122
8221992940,293cyclictest31768-21kworker/u16:1+efi_rts_wq08:45:122
8220992940,293cyclictest15901-21kworker/u16:2+efi_rts_wq07:55:111
8221992930,292cyclictest8017-21kworker/u16:1+efi_rts_wq11:13:472
8220992930,292cyclictest2520-21kworker/u16:2+efi_rts_wq09:30:131
8219992930,292cyclictest9738-21kworker/u16:0+efi_rts_wq09:05:140
8219992920,291cyclictest31768-21kworker/u16:1+efi_rts_wq08:25:120
8219992920,291cyclictest12031-21kworker/u16:2+efi_rts_wq08:35:130
8221992910,290cyclictest6863-21kworker/u16:3+efi_rts_wq10:20:132
8221992910,290cyclictest10500-21kworker/u16:2+efi_rts_wq11:25:132
8219992900,289cyclictest31768-21kworker/u16:1+efi_rts_wq09:13:220
8219992900,289cyclictest2520-21kworker/u16:2+efi_rts_wq09:40:120
8222992890,288cyclictest8017-21kworker/u16:1+efi_rts_wq11:20:113
8222992890,288cyclictest1798-21kworker/u16:2+efi_rts_wq12:15:133
8221992890,288cyclictest31768-21kworker/u16:1+efi_rts_wq09:15:122
8220992890,288cyclictest24868-21kworker/u16:3+efi_rts_wq11:30:131
8220992890,288cyclictest13811-21kworker/u16:3+efi_rts_wq07:53:061
8220992880,287cyclictest1798-21kworker/u16:2+efi_rts_wq12:05:121
8219992880,287cyclictest31768-21kworker/u16:1+efi_rts_wq10:35:130
8221992870,286cyclictest6150-21kworker/u16:0+efi_rts_wq12:00:092
8220992870,286cyclictest8017-21kworker/u16:1+efi_rts_wq11:08:451
8220992870,286cyclictest12031-21kworker/u16:2+efi_rts_wq08:40:131
8219992870,286cyclictest24868-21kworker/u16:3+efi_rts_wq11:50:120
8221992860,285cyclictest16617-21kworker/u16:0+efi_rts_wq07:35:142
8220992850,284cyclictest31768-21kworker/u16:1+efi_rts_wq09:35:131
8220992850,284cyclictest31768-21kworker/u16:1+efi_rts_wq09:20:131
8220992840,283cyclictest12517-21kworker/u16:1+efi_rts_wq12:20:111
8221992830,282cyclictest6863-21kworker/u16:3+efi_rts_wq10:10:132
8220992830,282cyclictest8970-21kworker/u16:0+efi_rts_wq09:53:301
8219992800,277cyclictest29879-21kworker/u16:2+efi_rts_wq10:40:140
8220992780,276cyclictest27203-21kworker/u16:0+efi_rts_wq11:35:131
8219992780,277cyclictest6863-21kworker/u16:3+efi_rts_wq10:15:110
8219992780,277cyclictest15901-21kworker/u16:2+efi_rts_wq07:50:170
8222992760,274cyclictest6863-21kworker/u16:3+efi_rts_wq10:30:143
8220992760,275cyclictest9738-21kworker/u16:0+efi_rts_wq08:38:141
8219992760,275cyclictest6863-21kworker/u16:3+efi_rts_wq10:30:130
8220992750,274cyclictest6863-21kworker/u16:3+efi_rts_wq09:55:141
8220992730,272cyclictest1798-21kworker/u16:2+efi_rts_wq12:30:121
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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