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2026-04-25 - 09:08

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 Apr 25, 2026 00:43:55)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
267852321315,4sleep20-21swapper/219:06:542
269572318303,5sleep00-21swapper/019:09:080
249632318311,4sleep30-21swapper/319:05:063
27291993170,316cyclictest25059-21kworker/u16:3+efi_rts_wq23:45:130
266902317310,5sleep10-21swapper/119:05:411
27294993140,313cyclictest17745-21kworker/u16:3+efi_rts_wq19:20:133
27294993140,313cyclictest17745-21kworker/u16:3+efi_rts_wq19:15:133
27292993140,313cyclictest17745-21kworker/u16:3+efi_rts_wq19:45:131
27291993120,311cyclictest18887-21kworker/u16:1+efi_rts_wq22:40:130
27294993100,309cyclictest18887-21kworker/u16:1+efi_rts_wq23:05:133
27291993100,309cyclictest30117-21kworker/u16:0+efi_rts_wq21:24:450
27294993090,308cyclictest12858-21kworker/u16:0+efi_rts_wq00:25:143
27291993090,308cyclictest12858-21kworker/u16:0+efi_rts_wq00:05:120
27294993080,307cyclictest18887-21kworker/u16:1+efi_rts_wq20:55:133
27291993080,307cyclictest10113-21kworker/u16:2+efi_rts_wq23:05:050
27294993070,306cyclictest17745-21kworker/u16:3+efi_rts_wq20:24:363
27293993070,306cyclictest18887-21kworker/u16:1+efi_rts_wq22:45:012
27293993070,306cyclictest18887-21kworker/u16:1+efi_rts_wq20:59:422
27293993070,306cyclictest17745-21kworker/u16:3+efi_rts_wq19:15:022
27292993030,302cyclictest12858-21kworker/u16:0+efi_rts_wq23:50:121
27291993020,301cyclictest7053-21kworker/u16:3+efi_rts_wq23:15:120
27291993020,301cyclictest17745-21kworker/u16:3+efi_rts_wq19:35:120
27294993010,300cyclictest18887-21kworker/u16:1+efi_rts_wq22:25:143
27294993000,299cyclictest12858-21kworker/u16:0+efi_rts_wq23:40:133
27293993000,299cyclictest17745-21kworker/u16:3+efi_rts_wq19:10:122
27291993000,299cyclictest18887-21kworker/u16:1+efi_rts_wq22:19:570
27291993000,299cyclictest12858-21kworker/u16:0+efi_rts_wq00:10:120
27292992990,298cyclictest18887-21kworker/u16:1+efi_rts_wq22:25:131
27292992980,297cyclictest22375-21kworker/u16:2+efi_rts_wq19:40:121
27294992970,296cyclictest18887-21kworker/u16:1+efi_rts_wq21:20:103
27293992970,296cyclictest22375-21kworker/u16:2+efi_rts_wq19:30:122
27291992970,296cyclictest30117-21kworker/u16:0+efi_rts_wq20:25:130
27292992950,294cyclictest12858-21kworker/u16:0+efi_rts_wq23:30:111
27292992940,293cyclictest12858-21kworker/u16:0+efi_rts_wq00:00:111
27292992930,290cyclictest30117-21kworker/u16:0+efi_rts_wq21:25:121
27294992910,290cyclictest18887-21kworker/u16:1+efi_rts_wq23:25:143
27291992910,290cyclictest17745-21kworker/u16:3+efi_rts_wq19:55:120
27294992900,289cyclictest30117-21kworker/u16:0+efi_rts_wq21:40:133
27294992900,289cyclictest18887-21kworker/u16:1+efi_rts_wq20:50:123
27293992900,289cyclictest25059-21kworker/u16:3+efi_rts_wq00:15:152
27292992900,289cyclictest18887-21kworker/u16:1+efi_rts_wq21:35:131
27292992900,289cyclictest18887-21kworker/u16:1+efi_rts_wq20:39:381
27291992890,288cyclictest12858-21kworker/u16:0+efi_rts_wq00:30:120
27291992880,287cyclictest18887-21kworker/u16:1+efi_rts_wq20:55:130
27291992880,287cyclictest18887-21kworker/u16:1+efi_rts_wq20:45:140
27294992860,285cyclictest30117-21kworker/u16:0+efi_rts_wq21:50:133
27294992860,285cyclictest18887-21kworker/u16:1+efi_rts_wq23:20:133
27294992840,283cyclictest30117-21kworker/u16:0+efi_rts_wq21:45:153
27291992840,283cyclictest18887-21kworker/u16:1+efi_rts_wq21:55:120
27291992840,283cyclictest17745-21kworker/u16:3+efi_rts_wq19:10:120
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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