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2026-04-24 - 05:25

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 Apr 24, 2026 00:43:56)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
127222336314,4sleep20-21swapper/219:06:272
129952322315,4sleep30-21swapper/319:09:573
13265993160,313cyclictest25297-21kworker/u16:4+efi_rts_wq21:10:133
129692316310,4sleep10-21swapper/119:09:391
129682315308,5sleep00-21swapper/019:09:390
13263993120,311cyclictest28889-21kworker/u16:3+efi_rts_wq23:10:381
13262993110,310cyclictest25297-21kworker/u16:4+efi_rts_wq22:30:310
13264993100,309cyclictest1995-21kworker/u16:1+efi_rts_wq23:15:122
13262993100,309cyclictest10695-21kworker/u16:0+efi_rts_wq20:30:120
13265993090,308cyclictest25297-21kworker/u16:4+efi_rts_wq21:35:133
13263993090,308cyclictest24670-21kworker/u16:1+efi_rts_wq00:10:131
13265993050,304cyclictest28889-21kworker/u16:3+efi_rts_wq23:55:133
13265993050,302cyclictest21964-21kworker/u16:0+efi_rts_wq00:05:133
13262993050,304cyclictest10608-21kworker/u16:2+efi_rts_wq23:20:410
13265993040,303cyclictest25297-21kworker/u16:4+efi_rts_wq19:25:123
13263993040,303cyclictest25297-21kworker/u16:4+efi_rts_wq21:10:131
13265993030,302cyclictest24670-21kworker/u16:1+efi_rts_wq00:25:133
13265993020,301cyclictest10695-21kworker/u16:0+efi_rts_wq20:20:133
13265993010,300cyclictest25297-21kworker/u16:4+efi_rts_wq19:10:133
13264993010,300cyclictest25297-21kworker/u16:4+efi_rts_wq19:45:122
13264993010,300cyclictest25297-21kworker/u16:4+efi_rts_wq19:45:112
13262993010,300cyclictest25297-21kworker/u16:4+efi_rts_wq20:05:120
13265993000,299cyclictest14719-21kworker/u16:1+efi_rts_wq23:05:133
13263993000,299cyclictest25297-21kworker/u16:4+efi_rts_wq21:55:161
13263993000,299cyclictest10695-21kworker/u16:0+efi_rts_wq20:30:121
13265992990,298cyclictest25297-21kworker/u16:4+efi_rts_wq20:25:143
13264992990,298cyclictest10608-21kworker/u16:2+efi_rts_wq22:55:362
13265992970,296cyclictest28889-21kworker/u16:3+efi_rts_wq23:10:133
13262992970,296cyclictest10608-21kworker/u16:2+efi_rts_wq23:35:120
13265992950,294cyclictest10608-21kworker/u16:2+efi_rts_wq23:40:123
13263992950,294cyclictest10695-21kworker/u16:0+efi_rts_wq20:45:131
13263992950,294cyclictest10608-21kworker/u16:2+efi_rts_wq23:30:141
13264992940,293cyclictest10695-21kworker/u16:0+efi_rts_wq20:10:132
13264992940,293cyclictest10695-21kworker/u16:0+efi_rts_wq19:40:132
13262992920,291cyclictest10695-21kworker/u16:0+efi_rts_wq20:55:120
13263992910,290cyclictest25297-21kworker/u16:4+efi_rts_wq20:35:131
13262992910,290cyclictest10695-21kworker/u16:0+efi_rts_wq22:35:310
13265992900,289cyclictest10695-21kworker/u16:0+efi_rts_wq21:15:143
13263992900,288cyclictest10695-21kworker/u16:0+efi_rts_wq22:35:141
13264992890,288cyclictest21964-21kworker/u16:0+efi_rts_wq00:00:132
13263992870,286cyclictest10695-21kworker/u16:0+efi_rts_wq22:15:151
13262992850,284cyclictest10608-21kworker/u16:2+efi_rts_wq23:25:120
13263992840,283cyclictest10695-21kworker/u16:0+efi_rts_wq22:30:121
13265992830,282cyclictest25297-21kworker/u16:4+efi_rts_wq22:25:143
13264992830,282cyclictest21964-21kworker/u16:0+efi_rts_wq00:15:112
13264992810,280cyclictest28889-21kworker/u16:3+efi_rts_wq23:40:432
13263992810,280cyclictest21964-21kworker/u16:0+efi_rts_wq00:05:121
13265992800,279cyclictest25297-21kworker/u16:4+efi_rts_wq22:05:253
13263992800,279cyclictest10695-21kworker/u16:0+efi_rts_wq19:49:591
13263992800,279cyclictest10695-21kworker/u16:0+efi_rts_wq19:49:581
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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