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2026-05-22 - 04:17

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 22, 2026 00:43:55)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
206952333305,25sleep20-21swapper/219:05:162
218222316308,5sleep10-21swapper/119:08:031
217742316308,5sleep30-21swapper/319:07:253
217322314307,5sleep00-21swapper/019:06:530
22242993030,302cyclictest31460-21kworker/u16:3+efi_rts_wq23:25:223
22241993000,298cyclictest26095-21kworker/u16:0+efi_rts_wq23:30:122
22240993000,299cyclictest25895-21kworker/u16:1+efi_rts_wq19:10:131
22242992990,298cyclictest29773-21kworker/u16:2+efi_rts_wq20:20:113
22241992990,298cyclictest29773-21kworker/u16:2+efi_rts_wq20:10:112
22240992990,298cyclictest31460-21kworker/u16:3+efi_rts_wq23:40:121
22242992980,297cyclictest29773-21kworker/u16:2+efi_rts_wq20:10:113
22241992980,297cyclictest25895-21kworker/u16:1+efi_rts_wq20:05:112
22242992960,295cyclictest19783-21kworker/u16:0+efi_rts_wq22:45:133
22240992960,295cyclictest25895-21kworker/u16:1+efi_rts_wq19:15:131
22242992950,294cyclictest19783-21kworker/u16:0+efi_rts_wq21:10:123
22242992940,293cyclictest25895-21kworker/u16:1+efi_rts_wq20:30:113
22240992940,293cyclictest29773-21kworker/u16:2+efi_rts_wq19:30:121
22242992930,292cyclictest29773-21kworker/u16:2+efi_rts_wq20:25:133
22242992930,292cyclictest26095-21kworker/u16:0+efi_rts_wq23:15:203
22241992930,292cyclictest19783-21kworker/u16:0+efi_rts_wq22:50:112
22239992920,291cyclictest29773-21kworker/u16:2+efi_rts_wq19:35:110
22239992910,290cyclictest25895-21kworker/u16:1+efi_rts_wq19:45:120
22242992900,289cyclictest26095-21kworker/u16:0+efi_rts_wq23:30:123
22242992900,289cyclictest19783-21kworker/u16:0+efi_rts_wq21:45:033
22240992900,289cyclictest26095-21kworker/u16:0+efi_rts_wq23:45:261
22240992900,289cyclictest25877-21kworker/u16:3+efi_rts_wq20:45:111
22241992890,288cyclictest15197-21kworker/u16:2+efi_rts_wq00:10:122
22240992890,288cyclictest19783-21kworker/u16:0+efi_rts_wq21:30:121
22239992890,288cyclictest25895-21kworker/u16:1+efi_rts_wq19:40:100
22241992880,287cyclictest25877-21kworker/u16:3+efi_rts_wq22:10:122
22240992880,287cyclictest25877-21kworker/u16:3+efi_rts_wq21:09:561
22239992880,287cyclictest19783-21kworker/u16:0+efi_rts_wq20:35:100
22239992860,285cyclictest29773-21kworker/u16:2+efi_rts_wq20:10:120
22241992850,284cyclictest25877-21kworker/u16:3+efi_rts_wq21:40:112
22240992840,283cyclictest19783-21kworker/u16:0+efi_rts_wq22:05:111
22240992810,280cyclictest25877-21kworker/u16:3+efi_rts_wq22:55:141
22239992800,279cyclictest29773-21kworker/u16:2+efi_rts_wq20:25:120
22240992790,278cyclictest26095-21kworker/u16:0+efi_rts_wq23:50:131
22240992790,278cyclictest25895-21kworker/u16:1+efi_rts_wq20:05:101
22241992780,277cyclictest25877-21kworker/u16:3+efi_rts_wq21:05:122
22239992780,277cyclictest31460-21kworker/u16:3+efi_rts_wq23:50:270
22239992780,277cyclictest25895-21kworker/u16:1+efi_rts_wq19:55:130
22242992770,276cyclictest19783-21kworker/u16:0+efi_rts_wq22:20:113
22240992760,275cyclictest25877-21kworker/u16:3+efi_rts_wq21:00:131
22241992750,274cyclictest15197-21kworker/u16:2+efi_rts_wq00:30:132
22240992740,273cyclictest15197-21kworker/u16:2+efi_rts_wq00:20:121
22242992730,272cyclictest15197-21kworker/u16:2+efi_rts_wq00:20:123
22240992730,272cyclictest19783-21kworker/u16:0+efi_rts_wq20:54:541
22239992730,272cyclictest25877-21kworker/u16:3+efi_rts_wq22:25:120
22239992720,271cyclictest26095-21kworker/u16:0+efi_rts_wq23:10:110
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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