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2025-07-12 - 12:36

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 Sat Jul 12, 2025 00:43:55)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
96162317303,5sleep00-21swapper/019:08:270
96532316302,5sleep20-21swapper/219:08:572
95182315308,4sleep10-21swapper/119:07:121
94412315307,5sleep30-21swapper/319:06:143
10003992980,295cyclictest4653-21kworker/u16:1+efi_rts_wq23:35:232
10001992980,296cyclictest7140-21kworker/u16:2+efi_rts_wq23:00:120
10004992960,295cyclictest7140-21kworker/u16:2+efi_rts_wq23:20:133
10002992960,295cyclictest11698-21kworker/u16:3+efi_rts_wq20:35:141
10003992950,294cyclictest25574-21kworker/u16:1+efi_rts_wq22:15:162
10001992940,293cyclictest25574-21kworker/u16:1+efi_rts_wq21:35:150
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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