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2026-07-16 - 02:17

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 Wed Jul 15, 2026 12:43:54)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
157102330323,4sleep30-21swapper/307:06:103
158932317309,5sleep00-21swapper/007:08:280
159312316310,4sleep10-21swapper/107:08:571
159122316304,4sleep20-21swapper/207:08:422
16279993020,300cyclictest25487-21kworker/u16:3+efi_rts_wq10:40:143
16278993010,300cyclictest15753-21kworker/u16:2+efi_rts_wq09:00:122
16279993000,299cyclictest15402-21kworker/u16:1+efi_rts_wq08:06:513
16276993000,299cyclictest15753-21kworker/u16:2+efi_rts_wq10:15:130
16277992990,298cyclictest14676-21kworker/u16:1+efi_rts_wq12:35:141
16277992960,295cyclictest15402-21kworker/u16:1+efi_rts_wq07:30:141
16278992950,294cyclictest25487-21kworker/u16:3+efi_rts_wq10:35:142
16276992950,294cyclictest15402-21kworker/u16:1+efi_rts_wq09:05:150
16277992930,292cyclictest15753-21kworker/u16:2+efi_rts_wq09:20:141
16279992920,291cyclictest15753-21kworker/u16:2+efi_rts_wq09:40:133
16277992920,291cyclictest15768-21kworker/u16:2+efi_rts_wq11:27:281
16279992910,290cyclictest14676-21kworker/u16:1+efi_rts_wq12:37:403
16277992910,290cyclictest15402-21kworker/u16:1+efi_rts_wq07:26:441
16278992900,289cyclictest15402-21kworker/u16:1+efi_rts_wq08:45:142
16277992900,289cyclictest15402-21kworker/u16:1+efi_rts_wq10:10:131
16276992900,289cyclictest15402-21kworker/u16:1+efi_rts_wq10:20:130
16278992890,288cyclictest15768-21kworker/u16:2+efi_rts_wq11:47:322
16279992860,285cyclictest14676-21kworker/u16:1+efi_rts_wq12:20:133
16278992850,284cyclictest15402-21kworker/u16:1+efi_rts_wq07:30:142
16278992840,281cyclictest15768-21kworker/u16:2+efi_rts_wq11:00:112
16276992840,283cyclictest15768-21kworker/u16:2+efi_rts_wq11:05:160
16279992830,282cyclictest15753-21kworker/u16:2+efi_rts_wq07:20:133
16277992830,282cyclictest14676-21kworker/u16:1+efi_rts_wq12:30:111
16276992830,282cyclictest15753-21kworker/u16:2+efi_rts_wq07:36:450
16278992820,281cyclictest15402-21kworker/u16:1+efi_rts_wq08:05:142
16276992820,281cyclictest15753-21kworker/u16:2+efi_rts_wq10:25:130
16279992800,279cyclictest15753-21kworker/u16:2+efi_rts_wq09:37:083
16279992800,279cyclictest15402-21kworker/u16:1+efi_rts_wq07:45:123
16278992800,279cyclictest15768-21kworker/u16:2+efi_rts_wq11:55:142
16277992800,279cyclictest15402-21kworker/u16:1+efi_rts_wq07:46:481
16277992800,277cyclictest15402-21kworker/u16:1+efi_rts_wq08:05:141
16279992790,278cyclictest15402-21kworker/u16:1+efi_rts_wq08:20:133
16278992780,277cyclictest14676-21kworker/u16:1+efi_rts_wq12:10:122
16279992770,274cyclictest15768-21kworker/u16:2+efi_rts_wq12:00:133
16277992770,276cyclictest9693-21kworker/u16:3+efi_rts_wq12:17:371
16277992770,276cyclictest15753-21kworker/u16:2+efi_rts_wq08:25:121
16276992770,276cyclictest15753-21kworker/u16:2+efi_rts_wq09:00:120
16277992760,275cyclictest15768-21kworker/u16:2+efi_rts_wq11:40:131
16276992750,274cyclictest15753-21kworker/u16:2+efi_rts_wq10:00:130
16276992730,271cyclictest15768-21kworker/u16:2+efi_rts_wq11:10:140
16278992720,271cyclictest15402-21kworker/u16:1+efi_rts_wq09:45:132
16276992720,271cyclictest9693-21kworker/u16:3+efi_rts_wq12:27:380
16276992720,271cyclictest15753-21kworker/u16:2+efi_rts_wq09:10:120
16279992710,270cyclictest15402-21kworker/u16:1+efi_rts_wq10:12:143
16276992700,269cyclictest25487-21kworker/u16:3+efi_rts_wq11:02:240
16276992700,269cyclictest15753-21kworker/u16:2+efi_rts_wq10:05:140
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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