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2025-10-29 - 03:11

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 10 highest latencies:
System rackcslot3s.osadl.org (updated Tue Oct 28, 2025 12:43:55)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
241132322307,5sleep00-21swapper/007:06:420
242082319304,5sleep10-21swapper/107:07:561
241792318304,4sleep20-21swapper/207:07:332
240792317309,5sleep30-21swapper/307:06:183
24637992960,295cyclictest26126-21kworker/u16:0+efi_rts_wq08:05:152
24637992940,293cyclictest26126-21kworker/u16:0+efi_rts_wq07:30:152
24638992930,291cyclictest26126-21kworker/u16:0+efi_rts_wq10:30:163
24638992930,291cyclictest26126-21kworker/u16:0+efi_rts_wq10:30:153
24635992930,292cyclictest26126-21kworker/u16:0+efi_rts_wq08:37:290
24636992920,289cyclictest27705-21kworker/u16:1+efi_rts_wq10:00:161
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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