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2025-12-28 - 03:10

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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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 Sun Dec 28, 2025 00:43:55)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
205932351304,29sleep00-21swapper/019:07:380
205852327320,5sleep20-21swapper/219:07:332
207382319313,4sleep10-21swapper/119:09:321
206832317310,4sleep30-21swapper/319:08:503
21043993110,310cyclictest2898-21kworker/u16:3+efi_rts_wq19:30:133
21043993110,310cyclictest22938-21kworker/u16:0+efi_rts_wq00:10:143
21041993110,310cyclictest27338-21kworker/u16:3+efi_rts_wq23:55:141
21041993100,309cyclictest2898-21kworker/u16:3+efi_rts_wq19:30:141
21040993100,309cyclictest633-21kworker/u16:2+efi_rts_wq20:35:140
21043993080,307cyclictest22938-21kworker/u16:0+efi_rts_wq00:30:133
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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