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2026-05-09 - 15:28

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 Sat May 09, 2026 12:43:55)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
194632339314,23sleep00-21swapper/007:06:510
196802316308,5sleep30-21swapper/307:09:383
196372316303,5sleep20-21swapper/207:09:052
195212316310,4sleep10-21swapper/107:07:361
19974993040,303cyclictest502-21kworker/u16:3+efi_rts_wq11:20:112
19975993000,299cyclictest24429-21kworker/u16:2+efi_rts_wq09:33:043
19973993000,299cyclictest30137-21kworker/u16:0+efi_rts_wq08:40:121
19975992990,298cyclictest24429-21kworker/u16:2+efi_rts_wq10:40:113
19975992980,296cyclictest10572-21kworker/u16:3+efi_rts_wq10:58:183
19975992970,296cyclictest30137-21kworker/u16:0+efi_rts_wq09:25:133
19972992950,294cyclictest2264-21kworker/u16:3+efi_rts_wq07:27:420
19973992940,293cyclictest24429-21kworker/u16:2+efi_rts_wq08:57:571
19973992930,292cyclictest24429-21kworker/u16:2+efi_rts_wq11:15:131
19973992930,292cyclictest24429-21kworker/u16:2+efi_rts_wq10:15:121
19974992920,291cyclictest502-21kworker/u16:3+efi_rts_wq11:25:132
19974992910,290cyclictest24429-21kworker/u16:2+efi_rts_wq08:55:112
19972992900,289cyclictest24429-21kworker/u16:2+efi_rts_wq10:25:150
19975992880,287cyclictest2264-21kworker/u16:3+efi_rts_wq07:57:473
19975992880,286cyclictest30137-21kworker/u16:0+efi_rts_wq08:35:143
19972992880,287cyclictest11844-21kworker/u16:0+efi_rts_wq11:45:120
19975992870,286cyclictest18785-21kworker/u16:1+efi_rts_wq12:33:363
19975992860,285cyclictest24429-21kworker/u16:2+efi_rts_wq09:10:133
19975992860,285cyclictest11844-21kworker/u16:0+efi_rts_wq11:53:293
19972992860,285cyclictest502-21kworker/u16:3+efi_rts_wq11:25:130
19972992860,285cyclictest2264-21kworker/u16:3+efi_rts_wq07:55:130
19973992850,284cyclictest2264-21kworker/u16:3+efi_rts_wq07:10:131
19972992850,284cyclictest24429-21kworker/u16:2+efi_rts_wq10:55:120
19972992850,284cyclictest24429-21kworker/u16:2+efi_rts_wq10:50:110
19973992840,283cyclictest30137-21kworker/u16:0+efi_rts_wq09:40:131
19972992820,281cyclictest30137-21kworker/u16:0+efi_rts_wq07:20:120
19975992810,280cyclictest30137-21kworker/u16:0+efi_rts_wq07:20:123
19975992800,279cyclictest16467-21kworker/u16:2+efi_rts_wq12:00:133
19974992790,278cyclictest10572-21kworker/u16:3+efi_rts_wq11:10:112
19974992780,276cyclictest10572-21kworker/u16:3+efi_rts_wq11:08:202
19975992770,276cyclictest24429-21kworker/u16:2+efi_rts_wq08:45:123
19974992770,276cyclictest2264-21kworker/u16:3+efi_rts_wq08:30:132
19972992770,276cyclictest24429-21kworker/u16:2+efi_rts_wq11:00:120
19972992770,276cyclictest24429-21kworker/u16:2+efi_rts_wq10:10:150
19974992760,275cyclictest24429-21kworker/u16:2+efi_rts_wq09:45:122
19975992750,274cyclictest30137-21kworker/u16:0+efi_rts_wq09:05:143
19975992730,272cyclictest30137-21kworker/u16:0+efi_rts_wq08:40:123
19974992730,272cyclictest2867-21kworker/u16:2+efi_rts_wq11:35:122
19973992720,271cyclictest11844-21kworker/u16:0+efi_rts_wq11:50:141
19972992720,271cyclictest18785-21kworker/u16:1+efi_rts_wq12:25:130
19972992720,271cyclictest18785-21kworker/u16:1+efi_rts_wq12:25:130
19972992710,269cyclictest30137-21kworker/u16:0+efi_rts_wq08:10:130
19973992700,268cyclictest16467-21kworker/u16:2+efi_rts_wq12:15:111
19975992690,268cyclictest30137-21kworker/u16:0+efi_rts_wq09:50:123
19973992690,268cyclictest2264-21kworker/u16:3+efi_rts_wq08:02:481
19972992690,268cyclictest24429-21kworker/u16:2+efi_rts_wq09:23:020
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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