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2026-05-16 - 02:52

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 May 15, 2026 12:43:54)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
152052332310,5sleep00-21swapper/007:08:230
151022322307,5sleep20-21swapper/207:07:042
152132320306,5sleep10-21swapper/107:08:281
153142317303,5sleep30-21swapper/307:09:463
15599993000,299cyclictest27805-21kworker/u16:2+efi_rts_wq11:50:123
15599992990,297cyclictest8921-21kworker/u16:3+efi_rts_wq07:40:123
15598992990,298cyclictest6626-21kworker/u16:3+efi_rts_wq09:10:112
15597992960,295cyclictest30928-21kworker/u16:2+efi_rts_wq10:22:461
15596992960,295cyclictest14875-21kworker/u16:1+efi_rts_wq08:55:110
15596992960,294cyclictest8073-21kworker/u16:3+efi_rts_wq10:45:120
15597992950,294cyclictest27805-21kworker/u16:2+efi_rts_wq11:22:581
15599992940,293cyclictest27805-21kworker/u16:2+efi_rts_wq11:38:013
15597992940,293cyclictest8073-21kworker/u16:3+efi_rts_wq11:02:541
15597992940,292cyclictest8073-21kworker/u16:3+efi_rts_wq11:15:131
15597992940,291cyclictest30588-21kworker/u16:2+efi_rts_wq08:00:131
15597992910,290cyclictest26970-21kworker/u16:3+efi_rts_wq10:15:121
15597992900,289cyclictest4268-21kworker/u16:3+efi_rts_wq12:23:071
15597992900,289cyclictest27805-21kworker/u16:2+efi_rts_wq12:10:131
15597992900,287cyclictest4268-21kworker/u16:3+efi_rts_wq12:00:131
15596992900,288cyclictest4268-21kworker/u16:3+efi_rts_wq11:50:130
15599992890,288cyclictest11508-21kworker/u16:1+efi_rts_wq11:55:123
15598992880,287cyclictest5918-21kworker/u16:2+efi_rts_wq09:40:112
15597992880,287cyclictest6626-21kworker/u16:3+efi_rts_wq09:10:111
15597992880,287cyclictest4268-21kworker/u16:3+efi_rts_wq12:15:131
15597992870,286cyclictest6626-21kworker/u16:3+efi_rts_wq08:10:111
15596992870,286cyclictest31479-21kworker/u16:0+efi_rts_wq07:37:140
15596992870,286cyclictest26834-21kworker/u16:0+efi_rts_wq12:33:090
15599992860,285cyclictest27805-21kworker/u16:2+efi_rts_wq11:45:133
15597992860,285cyclictest6626-21kworker/u16:3+efi_rts_wq08:15:131
15597992860,284cyclictest27805-21kworker/u16:2+efi_rts_wq12:25:111
15596992860,285cyclictest14875-21kworker/u16:1+efi_rts_wq09:00:130
15599992850,284cyclictest5918-21kworker/u16:2+efi_rts_wq10:05:123
15597992840,283cyclictest30588-21kworker/u16:2+efi_rts_wq08:25:131
15597992810,280cyclictest3452-21kworker/u16:0+efi_rts_wq09:37:371
15596992810,280cyclictest5918-21kworker/u16:2+efi_rts_wq10:05:120
15599992790,278cyclictest31479-21kworker/u16:0+efi_rts_wq07:35:123
15598992790,277cyclictest10978-21kworker/u16:2+efi_rts_wq10:55:132
15597992790,278cyclictest30588-21kworker/u16:2+efi_rts_wq08:20:121
15596992790,278cyclictest5232-21kworker/u16:2+efi_rts_wq10:35:130
15597992780,277cyclictest27805-21kworker/u16:2+efi_rts_wq11:48:011
15597992770,276cyclictest6626-21kworker/u16:3+efi_rts_wq09:05:141
15597992770,276cyclictest30588-21kworker/u16:2+efi_rts_wq07:50:131
15597992770,276cyclictest10978-21kworker/u16:2+efi_rts_wq10:55:111
15596992750,274cyclictest6626-21kworker/u16:3+efi_rts_wq08:42:270
15599992740,273cyclictest27805-21kworker/u16:2+efi_rts_wq12:05:123
15597992730,272cyclictest14875-21kworker/u16:1+efi_rts_wq08:50:121
15599992720,271cyclictest27805-21kworker/u16:2+efi_rts_wq12:20:143
15596992720,271cyclictest27805-21kworker/u16:2+efi_rts_wq11:43:020
15597992710,270cyclictest20259-21kworker/u16:1+efi_rts_wq11:12:561
15596992710,270cyclictest8073-21kworker/u16:3+efi_rts_wq11:10:120
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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