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2026-08-03 - 06:04

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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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 Mon Aug 03, 2026 00:43:53)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
232972319305,4sleep20-21swapper/219:07:122
234032316303,10sleep00-21swapper/019:08:340
216752316310,4sleep30-21swapper/319:05:053
234852315309,4sleep10-21swapper/119:09:361
23781993030,300cyclictest9388-21kworker/u16:1+efi_rts_wq19:40:110
23785993000,299cyclictest22364-21kworker/u16:1+efi_rts_wq22:35:123
23785993000,299cyclictest12612-21kworker/u16:3+efi_rts_wq21:35:133
23784993000,299cyclictest11251-21kworker/u16:3+efi_rts_wq22:45:132
23784992990,298cyclictest22364-21kworker/u16:1+efi_rts_wq21:50:122
23783992990,298cyclictest22364-21kworker/u16:1+efi_rts_wq22:00:131
23784992980,297cyclictest22364-21kworker/u16:1+efi_rts_wq22:25:142
23784992980,297cyclictest12612-21kworker/u16:3+efi_rts_wq19:39:142
23781992980,297cyclictest16556-21kworker/u16:2+efi_rts_wq23:00:130
23781992980,297cyclictest16556-21kworker/u16:2+efi_rts_wq21:25:170
23784992970,296cyclictest16556-21kworker/u16:2+efi_rts_wq21:34:342
23781992960,295cyclictest12612-21kworker/u16:3+efi_rts_wq20:29:230
23783992950,294cyclictest20335-21kworker/u16:1+efi_rts_wq23:20:131
23785992940,293cyclictest20335-21kworker/u16:1+efi_rts_wq23:05:133
23785992930,292cyclictest12612-21kworker/u16:3+efi_rts_wq21:40:123
23784992930,292cyclictest12612-21kworker/u16:3+efi_rts_wq19:10:132
23783992930,292cyclictest12612-21kworker/u16:3+efi_rts_wq21:05:131
23785992920,291cyclictest22364-21kworker/u16:1+efi_rts_wq22:20:133
23783992920,291cyclictest12612-21kworker/u16:3+efi_rts_wq20:25:131
23784992910,290cyclictest12612-21kworker/u16:3+efi_rts_wq19:45:132
23785992900,289cyclictest20335-21kworker/u16:1+efi_rts_wq23:15:143
23785992900,288cyclictest20335-21kworker/u16:1+efi_rts_wq22:55:153
23781992900,289cyclictest16556-21kworker/u16:2+efi_rts_wq20:50:120
23785992870,286cyclictest9388-21kworker/u16:1+efi_rts_wq20:00:143
23784992870,286cyclictest16556-21kworker/u16:2+efi_rts_wq20:30:152
23781992870,286cyclictest12612-21kworker/u16:3+efi_rts_wq21:30:140
23785992860,284cyclictest11722-21kworker/u16:2+efi_rts_wq00:20:123
23785992850,284cyclictest9388-21kworker/u16:1+efi_rts_wq19:50:133
23784992850,284cyclictest20335-21kworker/u16:1+efi_rts_wq23:10:132
23784992850,282cyclictest22364-21kworker/u16:1+efi_rts_wq22:10:122
23781992850,284cyclictest20335-21kworker/u16:1+efi_rts_wq23:20:140
23785992840,283cyclictest19020-21kworker/u16:3+efi_rts_wq23:55:123
23785992840,283cyclictest11722-21kworker/u16:2+efi_rts_wq00:00:123
23784992830,282cyclictest11722-21kworker/u16:2+efi_rts_wq00:10:122
23781992810,280cyclictest9388-21kworker/u16:1+efi_rts_wq19:34:140
23784992800,279cyclictest9388-21kworker/u16:1+efi_rts_wq20:09:202
23781992800,279cyclictest11722-21kworker/u16:2+efi_rts_wq23:50:140
23784992790,278cyclictest11722-21kworker/u16:2+efi_rts_wq00:35:152
23784992790,276cyclictest12612-21kworker/u16:3+efi_rts_wq20:15:122
23781992790,278cyclictest16556-21kworker/u16:2+efi_rts_wq20:59:290
23785992770,276cyclictest28031-21kworker/u16:3+efi_rts_wq23:25:133
23784992770,274cyclictest16556-21kworker/u16:2+efi_rts_wq23:00:132
23785992760,275cyclictest19020-21kworker/u16:3+efi_rts_wq00:15:143
23784992760,275cyclictest3076-21kworker/u16:0+efi_rts_wq23:45:132
23784992750,274cyclictest16556-21kworker/u16:2+efi_rts_wq22:19:442
23784992750,274cyclictest16556-21kworker/u16:2+efi_rts_wq22:19:432
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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