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2026-08-12 - 07:04

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 Aug 12, 2026 00:43:54)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
104672320314,4sleep10-21swapper/119:08:551
103672315308,5sleep30-21swapper/319:07:373
102632315309,4sleep20-21swapper/219:06:162
102072314307,4sleep00-21swapper/019:05:330
10817993000,299cyclictest29682-21kworker/u16:0+efi_rts_wq23:44:581
10819992980,297cyclictest702-21kworker/u16:2+efi_rts_wq22:34:483
10819992980,297cyclictest24917-21kworker/u16:0+efi_rts_wq22:10:123
10818992960,295cyclictest527-21kworker/u16:2+efi_rts_wq23:50:122
10817992950,294cyclictest29682-21kworker/u16:0+efi_rts_wq00:15:141
10816992940,293cyclictest29682-21kworker/u16:0+efi_rts_wq00:20:140
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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