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2026-04-27 - 10:07

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 Mon Apr 27, 2026 00:43:56)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
258522331324,4sleep30-21swapper/319:05:593
258922320313,5sleep10-21swapper/119:06:291
260122317311,4sleep20-21swapper/219:08:022
241092316308,5sleep00-21swapper/019:05:120
26434993140,313cyclictest25472-21kworker/u16:3+efi_rts_wq19:15:143
26432993140,313cyclictest27616-21kworker/u16:4+efi_rts_wq00:05:111
26432993130,312cyclictest5490-21kworker/u16:1+efi_rts_wq00:10:121
26433993110,310cyclictest18626-21kworker/u16:1+efi_rts_wq21:40:122
26431993100,309cyclictest4109-21kworker/u16:3+efi_rts_wq23:10:140
26431993100,309cyclictest25472-21kworker/u16:3+efi_rts_wq20:25:150
26434993090,308cyclictest25472-21kworker/u16:3+efi_rts_wq20:30:133
26433993070,306cyclictest4109-21kworker/u16:3+efi_rts_wq23:00:132
26434993060,305cyclictest18626-21kworker/u16:1+efi_rts_wq22:50:143
26432993060,305cyclictest30413-21kworker/u16:0+efi_rts_wq21:49:381
26433993050,304cyclictest4109-21kworker/u16:3+efi_rts_wq23:15:122
26433993050,304cyclictest3941-21kworker/u16:2+efi_rts_wq19:50:142
26431993040,303cyclictest18626-21kworker/u16:1+efi_rts_wq20:15:140
26431993040,301cyclictest27616-21kworker/u16:4+efi_rts_wq00:15:140
26432993030,302cyclictest27616-21kworker/u16:4+efi_rts_wq00:20:131
26432993020,301cyclictest7305-21kworker/u16:2+efi_rts_wq22:00:141
26434993010,300cyclictest9730-21kworker/u16:1+efi_rts_wq23:30:123
26432993010,299cyclictest14218-21kworker/u16:2+efi_rts_wq22:20:141
26431993010,300cyclictest25472-21kworker/u16:3+efi_rts_wq19:59:200
26434993000,299cyclictest14218-21kworker/u16:2+efi_rts_wq22:20:143
26433993000,299cyclictest27616-21kworker/u16:4+efi_rts_wq23:50:132
26434992990,298cyclictest14218-21kworker/u16:2+efi_rts_wq22:15:123
26433992990,298cyclictest9730-21kworker/u16:1+efi_rts_wq23:20:152
26434992980,297cyclictest25472-21kworker/u16:3+efi_rts_wq20:00:133
26433992980,297cyclictest18626-21kworker/u16:1+efi_rts_wq21:15:142
26434992970,296cyclictest3941-21kworker/u16:2+efi_rts_wq19:44:173
26434992970,296cyclictest18626-21kworker/u16:1+efi_rts_wq20:35:123
26434992950,294cyclictest4109-21kworker/u16:3+efi_rts_wq23:55:133
26434992950,294cyclictest30413-21kworker/u16:0+efi_rts_wq22:09:423
26434992950,294cyclictest27616-21kworker/u16:4+efi_rts_wq00:11:073
26434992950,294cyclictest11121-21kworker/u16:0+efi_rts_wq19:24:133
26433992940,293cyclictest30413-21kworker/u16:0+efi_rts_wq21:35:122
26432992940,293cyclictest30413-21kworker/u16:0+efi_rts_wq20:44:271
26431992940,293cyclictest27616-21kworker/u16:4+efi_rts_wq00:00:150
26431992930,292cyclictest4109-21kworker/u16:3+efi_rts_wq23:40:130
26434992900,289cyclictest30413-21kworker/u16:0+efi_rts_wq20:50:153
26434992900,289cyclictest14218-21kworker/u16:2+efi_rts_wq22:25:133
26431992900,289cyclictest25472-21kworker/u16:3+efi_rts_wq20:24:230
26434992890,288cyclictest27616-21kworker/u16:4+efi_rts_wq00:16:073
26431992880,287cyclictest25472-21kworker/u16:3+efi_rts_wq20:05:130
26431992870,286cyclictest25472-21kworker/u16:3+efi_rts_wq19:25:140
26432992860,285cyclictest25472-21kworker/u16:3+efi_rts_wq19:15:141
26432992830,282cyclictest4109-21kworker/u16:3+efi_rts_wq23:45:121
26431992810,280cyclictest27616-21kworker/u16:4+efi_rts_wq00:30:140
26431992800,279cyclictest27616-21kworker/u16:4+efi_rts_wq00:35:130
26432992780,277cyclictest4109-21kworker/u16:3+efi_rts_wq23:05:121
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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