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2025-05-14 - 23:32

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 14, 2025 12:43:55)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
178562326303,5sleep00-21swapper/007:07:370
177812317303,5sleep30-21swapper/307:06:403
162112317303,5sleep20-21swapper/207:05:112
162002317304,4sleep10-21swapper/107:05:021
18304993070,306cyclictest24972-21kworker/u16:2+efi_rts_wq09:55:141
18303993070,306cyclictest24972-21kworker/u16:2+efi_rts_wq10:20:130
18304993040,303cyclictest16900-21kworker/u16:1+efi_rts_wq11:00:141
18304993030,302cyclictest17423-21kworker/u16:0+efi_rts_wq10:40:121
18303993030,302cyclictest24972-21kworker/u16:2+efi_rts_wq10:10:140
18305993010,300cyclictest24972-21kworker/u16:2+efi_rts_wq10:05:122
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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