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2026-07-10 - 01:42

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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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

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 50 highest latencies:
System rackcslot3s.osadl.org (updated Thu Jul 09, 2026 12:43:54)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
303202318304,4sleep00-21swapper/007:09:180
302682317309,5sleep30-21swapper/307:08:383
285262316302,5sleep10-21swapper/107:05:031
300572314307,5sleep20-21swapper/207:05:562
30640993010,300cyclictest922-21kworker/u16:0+efi_rts_wq08:00:131
30641993000,299cyclictest3867-21kworker/u16:1+efi_rts_wq09:20:132
30640992980,297cyclictest3867-21kworker/u16:1+efi_rts_wq08:55:111
30642992960,295cyclictest4962-21kworker/u16:1+efi_rts_wq07:35:123
30640992960,295cyclictest5835-21kworker/u16:2+efi_rts_wq07:15:001
30640992960,295cyclictest25313-21kworker/u16:0+efi_rts_wq09:53:001
30642992950,294cyclictest922-21kworker/u16:0+efi_rts_wq08:05:113
30641992950,294cyclictest22614-21kworker/u16:2+efi_rts_wq12:10:122
30641992950,294cyclictest22614-21kworker/u16:2+efi_rts_wq11:30:132
30642992940,293cyclictest28873-21kworker/u16:1+efi_rts_wq10:55:123
30642992940,293cyclictest15635-21kworker/u16:0+efi_rts_wq10:30:113
30639992930,292cyclictest3791-21kworker/u16:1+efi_rts_wq12:33:270
30642992920,291cyclictest15635-21kworker/u16:0+efi_rts_wq10:38:083
30641992920,291cyclictest8153-21kworker/u16:3+efi_rts_wq09:40:112
30639992870,286cyclictest922-21kworker/u16:0+efi_rts_wq08:30:120
30639992870,286cyclictest15635-21kworker/u16:0+efi_rts_wq10:40:120
30639992870,286cyclictest15635-21kworker/u16:0+efi_rts_wq10:40:110
30641992850,284cyclictest5835-21kworker/u16:2+efi_rts_wq07:15:012
30639992850,284cyclictest3791-21kworker/u16:1+efi_rts_wq12:28:280
30642992840,283cyclictest4962-21kworker/u16:1+efi_rts_wq07:45:123
30641992840,283cyclictest28873-21kworker/u16:1+efi_rts_wq11:10:142
30639992840,283cyclictest9794-21kworker/u16:3+efi_rts_wq10:35:120
30641992830,282cyclictest25313-21kworker/u16:0+efi_rts_wq09:48:002
30640992830,282cyclictest922-21kworker/u16:0+efi_rts_wq08:27:451
30640992830,282cyclictest24366-21kworker/u16:3+efi_rts_wq07:30:131
30642992820,281cyclictest27949-21kworker/u16:2+efi_rts_wq08:45:113
30640992820,281cyclictest3867-21kworker/u16:1+efi_rts_wq09:05:131
30639992810,280cyclictest922-21kworker/u16:0+efi_rts_wq08:05:120
30640992800,279cyclictest22902-21kworker/u16:2+efi_rts_wq09:25:141
30639992800,279cyclictest4735-21kworker/u16:3+efi_rts_wq12:00:090
30641992790,278cyclictest28873-21kworker/u16:1+efi_rts_wq11:00:122
30642992770,276cyclictest25313-21kworker/u16:0+efi_rts_wq09:42:593
30641992770,276cyclictest3791-21kworker/u16:1+efi_rts_wq12:35:122
30640992760,275cyclictest922-21kworker/u16:0+efi_rts_wq08:30:121
30640992760,275cyclictest4735-21kworker/u16:3+efi_rts_wq12:20:121
30642992750,274cyclictest4962-21kworker/u16:1+efi_rts_wq08:12:423
30642992750,274cyclictest4962-21kworker/u16:1+efi_rts_wq07:42:373
30642992750,274cyclictest4735-21kworker/u16:3+efi_rts_wq11:48:193
30640992750,274cyclictest22614-21kworker/u16:2+efi_rts_wq12:25:131
30639992750,274cyclictest9794-21kworker/u16:3+efi_rts_wq10:25:130
30642992720,271cyclictest22614-21kworker/u16:2+efi_rts_wq12:03:233
30640992720,271cyclictest8153-21kworker/u16:3+efi_rts_wq08:50:141
30640992720,271cyclictest15635-21kworker/u16:0+efi_rts_wq10:50:131
30642992700,268cyclictest25313-21kworker/u16:0+efi_rts_wq09:30:123
30642992690,268cyclictest10313-21kworker/u16:0+efi_rts_wq09:17:553
30640992680,266cyclictest4735-21kworker/u16:3+efi_rts_wq11:25:131
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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