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2026-07-31 - 20:08

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 20 highest latencies:
System rackcslot3s.osadl.org (updated Fri Jul 31, 2026 12:43:56)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
182812329302,24sleep00-21swapper/007:09:550
182472320307,4sleep10-21swapper/107:09:281
180472318312,4sleep30-21swapper/307:06:573
179892314306,5sleep20-21swapper/207:06:132
18555992990,298cyclictest27791-21kworker/u16:3+efi_rts_wq10:35:153
18553992980,297cyclictest27791-21kworker/u16:3+efi_rts_wq12:03:191
18553992950,294cyclictest23281-21kworker/u16:2+efi_rts_wq11:35:121
18552992950,294cyclictest27791-21kworker/u16:3+efi_rts_wq11:15:140
18552992940,293cyclictest7117-21kworker/u16:1+efi_rts_wq07:10:130
18554992920,291cyclictest24978-21kworker/u16:2+efi_rts_wq08:40:122
18553992920,291cyclictest7117-21kworker/u16:1+efi_rts_wq07:57:341
18552992920,291cyclictest21259-21kworker/u16:0+efi_rts_wq12:30:110
18555992910,290cyclictest7117-21kworker/u16:1+efi_rts_wq08:17:383
18555992910,290cyclictest21259-21kworker/u16:0+efi_rts_wq12:30:133
18555992900,287cyclictest27791-21kworker/u16:3+efi_rts_wq11:30:123
18554992900,289cyclictest27791-21kworker/u16:3+efi_rts_wq12:10:112
18552992900,289cyclictest27791-21kworker/u16:3+efi_rts_wq10:35:150
18555992880,287cyclictest27791-21kworker/u16:3+efi_rts_wq11:20:133
18554992870,285cyclictest27791-21kworker/u16:3+efi_rts_wq11:00:132
18553992870,286cyclictest27791-21kworker/u16:3+efi_rts_wq10:05:141
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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