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2026-05-13 - 03:31

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 Wed May 13, 2026 00:43:54)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
219212329303,24sleep20-21swapper/219:08:302
219122322315,5sleep30-21swapper/319:08:223
217182318311,5sleep10-21swapper/119:05:521
218522315307,5sleep00-21swapper/019:07:350
22302993020,300cyclictest27416-21kworker/u16:2+efi_rts_wq20:15:130
22302993010,300cyclictest27416-21kworker/u16:2+efi_rts_wq21:05:120
22305993000,297cyclictest12573-21kworker/u16:1+efi_rts_wq00:25:143
22303993000,299cyclictest19847-21kworker/u16:0+efi_rts_wq19:55:121
22302993000,299cyclictest20875-21kworker/u16:1+efi_rts_wq23:00:140
22305992990,297cyclictest27416-21kworker/u16:2+efi_rts_wq22:30:113
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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