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2026-05-28 - 08:45

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 Thu May 28, 2026 00:43:56)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
32562319311,5sleep20-21swapper/219:09:222
30132318308,8sleep00-21swapper/019:06:160
32552317310,5sleep10-21swapper/119:09:211
32172316309,5sleep30-21swapper/319:08:503
3573992990,298cyclictest3101-21kworker/u16:0+efi_rts_wq21:00:131
3574992970,296cyclictest3133-21kworker/u16:1+efi_rts_wq20:50:122
3574992970,296cyclictest3133-21kworker/u16:1+efi_rts_wq20:40:122
3575992960,295cyclictest3101-21kworker/u16:0+efi_rts_wq20:18:593
3575992960,295cyclictest23113-21kworker/u16:2+efi_rts_wq20:25:113
3574992950,294cyclictest3101-21kworker/u16:0+efi_rts_wq22:40:132
3573992950,294cyclictest3133-21kworker/u16:1+efi_rts_wq22:34:251
3572992950,294cyclictest3133-21kworker/u16:1+efi_rts_wq20:40:120
3573992940,293cyclictest13005-21kworker/u16:0+efi_rts_wq23:15:121
3575992930,292cyclictest27246-21kworker/u16:3+efi_rts_wq00:00:123
3573992930,292cyclictest27832-21kworker/u16:2+efi_rts_wq23:29:361
3573992920,291cyclictest3133-21kworker/u16:1+efi_rts_wq21:15:131
3572992920,291cyclictest30840-21kworker/u16:4+efi_rts_wq23:10:120
3575992910,290cyclictest27246-21kworker/u16:3+efi_rts_wq00:21:143
3575992900,289cyclictest30840-21kworker/u16:4+efi_rts_wq23:09:323
3572992900,289cyclictest3101-21kworker/u16:0+efi_rts_wq21:25:120
3575992880,287cyclictest23113-21kworker/u16:2+efi_rts_wq19:55:123
3575992880,287cyclictest13005-21kworker/u16:0+efi_rts_wq00:35:133
3573992880,287cyclictest3133-21kworker/u16:1+efi_rts_wq21:40:111
3573992880,287cyclictest13005-21kworker/u16:0+efi_rts_wq23:55:121
3572992860,285cyclictest3133-21kworker/u16:1+efi_rts_wq21:20:110
3574992850,284cyclictest23113-21kworker/u16:2+efi_rts_wq20:10:122
3574992840,283cyclictest30840-21kworker/u16:4+efi_rts_wq22:55:122
3574992840,283cyclictest13005-21kworker/u16:0+efi_rts_wq23:25:112
3574992830,282cyclictest23113-21kworker/u16:2+efi_rts_wq19:15:142
3574992830,281cyclictest30840-21kworker/u16:4+efi_rts_wq23:05:112
3574992820,281cyclictest3101-21kworker/u16:0+efi_rts_wq20:30:122
3573992820,281cyclictest3101-21kworker/u16:0+efi_rts_wq19:15:141
3574992810,280cyclictest3133-21kworker/u16:1+efi_rts_wq21:05:122
3574992810,280cyclictest3101-21kworker/u16:0+efi_rts_wq22:30:122
3572992810,280cyclictest3133-21kworker/u16:1+efi_rts_wq21:50:110
3572992810,280cyclictest13005-21kworker/u16:0+efi_rts_wq23:45:120
3573992770,276cyclictest3101-21kworker/u16:0+efi_rts_wq21:10:121
3573992760,275cyclictest3101-21kworker/u16:0+efi_rts_wq22:00:111
3574992750,273cyclictest3101-21kworker/u16:0+efi_rts_wq19:50:112
3573992740,273cyclictest23113-21kworker/u16:2+efi_rts_wq19:35:141
3572992740,273cyclictest3101-21kworker/u16:0+efi_rts_wq20:49:040
3573992730,272cyclictest3101-21kworker/u16:0+efi_rts_wq22:35:121
3575992720,271cyclictest3133-21kworker/u16:1+efi_rts_wq22:05:123
3574992720,271cyclictest23113-21kworker/u16:2+efi_rts_wq19:45:122
3572992710,270cyclictest23113-21kworker/u16:2+efi_rts_wq20:00:120
3572992710,269cyclictest3101-21kworker/u16:0+efi_rts_wq22:45:120
3574992700,269cyclictest13005-21kworker/u16:0+efi_rts_wq23:35:122
3572992700,269cyclictest23113-21kworker/u16:2+efi_rts_wq19:40:120
3574992670,266cyclictest13005-21kworker/u16:0+efi_rts_wq23:14:322
3575992660,265cyclictest23113-21kworker/u16:2+efi_rts_wq20:13:573
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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