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2026-09-23 - 21:35

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 Wed Sep 23, 2026 12:43:55)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
240812317311,4sleep30-21swapper/307:06:063
240992316303,10sleep10-21swapper/107:06:201
242272315302,4sleep00-21swapper/007:07:540
240852314307,5sleep20-21swapper/207:06:092
24654993090,308cyclictest16599-21kworker/u16:0+efi_rts_wq10:55:143
24651993060,305cyclictest16599-21kworker/u16:0+efi_rts_wq09:30:150
24651993040,303cyclictest16599-21kworker/u16:0+efi_rts_wq10:57:130
24651993040,303cyclictest16599-21kworker/u16:0+efi_rts_wq10:10:160
24651993040,303cyclictest16599-21kworker/u16:0+efi_rts_wq08:15:120
24654993030,301cyclictest7948-21kworker/u16:2+efi_rts_wq10:37:103
24653993030,302cyclictest16599-21kworker/u16:0+efi_rts_wq09:40:132
24654993010,300cyclictest16599-21kworker/u16:0+efi_rts_wq11:00:133
24654993000,299cyclictest31820-21kworker/u16:1+efi_rts_wq11:20:123
24653992990,298cyclictest16599-21kworker/u16:0+efi_rts_wq10:10:162
24651992990,298cyclictest16599-21kworker/u16:0+efi_rts_wq07:40:120
24654992980,297cyclictest7948-21kworker/u16:2+efi_rts_wq09:55:133
24654992980,297cyclictest16599-21kworker/u16:0+efi_rts_wq07:51:423
24651992980,297cyclictest7948-21kworker/u16:2+efi_rts_wq08:06:430
24654992960,295cyclictest6964-21kworker/u16:0+efi_rts_wq12:05:123
24653992960,295cyclictest16599-21kworker/u16:0+efi_rts_wq07:40:122
24652992950,294cyclictest31820-21kworker/u16:1+efi_rts_wq11:30:151
24654992940,292cyclictest6964-21kworker/u16:0+efi_rts_wq12:30:163
24653992940,293cyclictest16599-21kworker/u16:0+efi_rts_wq10:00:142
24651992940,293cyclictest7948-21kworker/u16:2+efi_rts_wq10:30:170
24651992940,293cyclictest16599-21kworker/u16:0+efi_rts_wq09:40:130
24653992930,291cyclictest29280-21kworker/u16:3+efi_rts_wq11:05:122
24651992930,292cyclictest12866-21kworker/u16:2+efi_rts_wq11:40:130
24651992900,289cyclictest7948-21kworker/u16:2+efi_rts_wq09:10:140
24651992880,287cyclictest7948-21kworker/u16:2+efi_rts_wq07:35:130
24653992870,286cyclictest16599-21kworker/u16:0+efi_rts_wq07:15:122
24651992870,286cyclictest20294-21kworker/u16:3+efi_rts_wq12:10:170
24652992860,285cyclictest12866-21kworker/u16:2+efi_rts_wq11:47:231
24652992850,284cyclictest7948-21kworker/u16:2+efi_rts_wq08:45:111
24653992840,283cyclictest16599-21kworker/u16:0+efi_rts_wq11:00:122
24652992840,283cyclictest31820-21kworker/u16:1+efi_rts_wq11:20:111
24651992840,283cyclictest7948-21kworker/u16:2+efi_rts_wq08:45:110
24651992840,283cyclictest16599-21kworker/u16:0+efi_rts_wq08:20:120
24651992830,282cyclictest7948-21kworker/u16:2+efi_rts_wq08:50:140
24651992830,282cyclictest16599-21kworker/u16:0+efi_rts_wq10:00:140
24653992810,280cyclictest20294-21kworker/u16:3+efi_rts_wq12:15:132
24653992800,279cyclictest12866-21kworker/u16:2+efi_rts_wq11:52:232
24652992790,278cyclictest7948-21kworker/u16:2+efi_rts_wq10:47:121
24651992780,277cyclictest16599-21kworker/u16:0+efi_rts_wq07:16:330
24651992770,276cyclictest7948-21kworker/u16:2+efi_rts_wq10:42:110
24651992770,276cyclictest7948-21kworker/u16:2+efi_rts_wq10:42:110
24654992760,275cyclictest29280-21kworker/u16:3+efi_rts_wq11:10:183
24653992760,275cyclictest20294-21kworker/u16:3+efi_rts_wq12:27:312
24653992750,274cyclictest7948-21kworker/u16:2+efi_rts_wq09:00:132
24652992750,274cyclictest7948-21kworker/u16:2+efi_rts_wq08:25:121
24654992740,273cyclictest16599-21kworker/u16:0+efi_rts_wq09:45:123
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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