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2026-05-12 - 03:52

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 Tue May 12, 2026 00:43:55)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
14692325303,19sleep20-21swapper/219:08:592
12182317310,5sleep00-21swapper/019:05:460
12712316309,5sleep30-21swapper/319:06:283
13122315308,5sleep10-21swapper/119:06:591
1814992990,298cyclictest1652-21kworker/u16:2+efi_rts_wq19:10:133
1813992970,296cyclictest1652-21kworker/u16:2+efi_rts_wq20:00:412
1812992970,296cyclictest1652-21kworker/u16:2+efi_rts_wq22:30:121
1813992960,295cyclictest1652-21kworker/u16:2+efi_rts_wq21:35:132
1814992940,292cyclictest2992-21kworker/u16:0+efi_rts_wq23:20:103
1812992940,293cyclictest27653-21kworker/u16:0+efi_rts_wq22:50:141
1812992930,292cyclictest2992-21kworker/u16:0+efi_rts_wq00:35:121
1812992930,292cyclictest1652-21kworker/u16:2+efi_rts_wq21:25:131
1813992920,291cyclictest1652-21kworker/u16:2+efi_rts_wq22:35:142
1813992920,291cyclictest1652-21kworker/u16:2+efi_rts_wq22:10:132
1813992920,291cyclictest10130-21kworker/u16:1+efi_rts_wq21:30:132
1811992920,291cyclictest1652-21kworker/u16:2+efi_rts_wq22:11:070
1811992920,291cyclictest10130-21kworker/u16:1+efi_rts_wq19:55:140
1814992910,290cyclictest29707-21kworker/u16:1+efi_rts_wq00:00:123
1811992910,290cyclictest1652-21kworker/u16:2+efi_rts_wq19:15:020
1813992900,289cyclictest10847-21kworker/u16:2+efi_rts_wq23:35:122
1811992900,289cyclictest15952-21kworker/u16:0+efi_rts_wq19:25:350
1811992890,288cyclictest1652-21kworker/u16:2+efi_rts_wq20:05:120
1812992880,287cyclictest10130-21kworker/u16:1+efi_rts_wq21:45:131
1814992870,285cyclictest10130-21kworker/u16:1+efi_rts_wq21:00:123
1813992870,286cyclictest2992-21kworker/u16:0+efi_rts_wq00:36:342
1813992870,286cyclictest1652-21kworker/u16:2+efi_rts_wq21:10:142
1812992870,286cyclictest2992-21kworker/u16:0+efi_rts_wq00:05:131
1812992860,285cyclictest1652-21kworker/u16:2+efi_rts_wq22:00:141
1811992850,284cyclictest23640-21kworker/u16:3+efi_rts_wq23:01:170
1812992840,283cyclictest10130-21kworker/u16:1+efi_rts_wq21:50:111
1812992840,282cyclictest2992-21kworker/u16:0+efi_rts_wq23:40:131
1811992840,283cyclictest2992-21kworker/u16:0+efi_rts_wq23:10:130
1811992830,282cyclictest1652-21kworker/u16:2+efi_rts_wq22:25:160
1811992820,281cyclictest10130-21kworker/u16:1+efi_rts_wq22:06:060
1811992820,281cyclictest10130-21kworker/u16:1+efi_rts_wq21:50:100
1814992810,280cyclictest2992-21kworker/u16:0+efi_rts_wq23:41:233
1814992810,280cyclictest2992-21kworker/u16:0+efi_rts_wq00:35:123
1811992810,280cyclictest1652-21kworker/u16:2+efi_rts_wq19:30:110
1813992800,278cyclictest10130-21kworker/u16:1+efi_rts_wq22:05:112
1811992790,278cyclictest1652-21kworker/u16:2+efi_rts_wq22:40:120
1811992790,278cyclictest15952-21kworker/u16:0+efi_rts_wq19:20:120
1811992790,278cyclictest10130-21kworker/u16:1+efi_rts_wq19:50:400
1811992790,278cyclictest10130-21kworker/u16:1+efi_rts_wq19:50:390
1814992780,277cyclictest10130-21kworker/u16:1+efi_rts_wq21:56:033
1812992780,277cyclictest2992-21kworker/u16:0+efi_rts_wq00:26:321
1812992780,276cyclictest300-21kworker/u16:1+efi_rts_wq23:00:131
1814992760,275cyclictest10130-21kworker/u16:1+efi_rts_wq21:15:133
1814992760,274cyclictest2992-21kworker/u16:0+efi_rts_wq23:50:123
1811992760,275cyclictest10130-21kworker/u16:1+efi_rts_wq20:10:140
1813992750,272cyclictest10130-21kworker/u16:1+efi_rts_wq20:20:122
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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