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2025-11-05 - 08:42

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 Wed Nov 05, 2025 00:43:53)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
34092316308,5sleep30-21swapper/319:07:593
33932315308,5sleep20-21swapper/219:07:462
33602315307,5sleep10-21swapper/119:07:211
32162314307,5sleep00-21swapper/019:05:310
3836992950,294cyclictest3696-21kworker/u16:1+efi_rts_wq20:05:152
3835992920,291cyclictest3696-21kworker/u16:1+efi_rts_wq19:15:141
3835992910,290cyclictest24866-21kworker/u16:3+efi_rts_wq23:00:111
3837992900,289cyclictest3696-21kworker/u16:1+efi_rts_wq21:04:413
3837992900,289cyclictest22535-21kworker/u16:1+efi_rts_wq23:45:123
3835992900,289cyclictest24866-21kworker/u16:3+efi_rts_wq23:10:141
3834992900,289cyclictest24866-21kworker/u16:3+efi_rts_wq22:40:170
3837992890,288cyclictest3696-21kworker/u16:1+efi_rts_wq21:20:153
3836992890,288cyclictest24831-21kworker/u16:2+efi_rts_wq00:10:142
3835992890,288cyclictest3696-21kworker/u16:1+efi_rts_wq21:20:141
3834992890,288cyclictest24831-21kworker/u16:2+efi_rts_wq23:50:090
3835992870,285cyclictest6052-21kworker/u16:0+efi_rts_wq23:15:141
3836992860,285cyclictest6052-21kworker/u16:0+efi_rts_wq23:40:132
3837992850,284cyclictest22535-21kworker/u16:1+efi_rts_wq00:35:123
3837992840,283cyclictest3696-21kworker/u16:1+efi_rts_wq19:55:173
3834992840,283cyclictest24866-21kworker/u16:3+efi_rts_wq20:59:400
3836992820,281cyclictest24866-21kworker/u16:3+efi_rts_wq23:30:052
3834992820,281cyclictest3696-21kworker/u16:1+efi_rts_wq22:09:500
3834992820,281cyclictest3696-21kworker/u16:1+efi_rts_wq21:10:150
3834992820,281cyclictest3696-21kworker/u16:1+efi_rts_wq19:59:270
3837992810,280cyclictest24866-21kworker/u16:3+efi_rts_wq20:25:143
3837992810,280cyclictest24866-21kworker/u16:3+efi_rts_wq19:40:133
3836992810,280cyclictest24866-21kworker/u16:3+efi_rts_wq20:55:142
3835992800,279cyclictest3696-21kworker/u16:1+efi_rts_wq22:15:131
3835992800,279cyclictest24866-21kworker/u16:3+efi_rts_wq22:00:121
3834992800,279cyclictest3696-21kworker/u16:1+efi_rts_wq20:45:140
3834992800,279cyclictest24866-21kworker/u16:3+efi_rts_wq23:05:130
3835992740,273cyclictest3696-21kworker/u16:1+efi_rts_wq19:25:121
3834992720,271cyclictest22535-21kworker/u16:1+efi_rts_wq00:15:140
3834992710,268cyclictest3696-21kworker/u16:1+efi_rts_wq21:30:150
3834992700,269cyclictest3696-21kworker/u16:1+efi_rts_wq20:35:140
3836992680,267cyclictest3696-21kworker/u16:1+efi_rts_wq22:50:132
3835992680,267cyclictest24866-21kworker/u16:3+efi_rts_wq19:50:131
3834992680,267cyclictest3696-21kworker/u16:1+efi_rts_wq21:59:490
3835992670,266cyclictest3696-21kworker/u16:1+efi_rts_wq22:35:141
3836992660,265cyclictest6052-21kworker/u16:0+efi_rts_wq23:25:152
3837992640,263cyclictest3696-21kworker/u16:1+efi_rts_wq19:20:133
3834992640,263cyclictest3696-21kworker/u16:1+efi_rts_wq22:39:570
3834992630,262cyclictest3696-21kworker/u16:1+efi_rts_wq22:20:120
3835992620,261cyclictest3696-21kworker/u16:1+efi_rts_wq20:30:171
3835992620,261cyclictest24866-21kworker/u16:3+efi_rts_wq21:50:141
3835992620,261cyclictest24866-21kworker/u16:3+efi_rts_wq21:50:141
3835992610,260cyclictest3696-21kworker/u16:1+efi_rts_wq20:20:171
3834992600,259cyclictest24866-21kworker/u16:3+efi_rts_wq23:00:120
3837992590,258cyclictest6052-21kworker/u16:0+efi_rts_wq23:40:133
3835992590,256cyclictest3696-21kworker/u16:1+efi_rts_wq21:35:141
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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