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2026-05-11 - 03:56

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 May 11, 2026 00:43:54)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
296082325318,5sleep30-21swapper/319:09:413
295072316308,5sleep10-21swapper/119:08:231
292812316309,5sleep20-21swapper/219:05:272
293192314307,5sleep00-21swapper/019:05:560
29899992990,298cyclictest25353-21kworker/u16:3+efi_rts_wq20:30:123
29897992980,297cyclictest23922-21kworker/u16:4+efi_rts_wq00:30:131
29899992970,296cyclictest3467-21kworker/u16:1+efi_rts_wq20:00:363
29899992970,296cyclictest18030-21kworker/u16:2+efi_rts_wq00:05:133
29898992970,296cyclictest25353-21kworker/u16:3+efi_rts_wq21:50:132
29896992960,295cyclictest23922-21kworker/u16:4+efi_rts_wq23:45:140
29897992950,293cyclictest23922-21kworker/u16:4+efi_rts_wq23:00:141
29896992950,294cyclictest6736-21kworker/u16:0+efi_rts_wq23:30:130
29896992950,294cyclictest25353-21kworker/u16:3+efi_rts_wq20:25:410
29897992940,293cyclictest3467-21kworker/u16:1+efi_rts_wq19:55:131
29896992940,293cyclictest25353-21kworker/u16:3+efi_rts_wq20:05:130
29897992920,291cyclictest25353-21kworker/u16:3+efi_rts_wq19:50:331
29896992920,291cyclictest25353-21kworker/u16:3+efi_rts_wq22:05:130
29896992920,291cyclictest23922-21kworker/u16:4+efi_rts_wq00:10:130
29897992910,290cyclictest3467-21kworker/u16:1+efi_rts_wq21:05:151
29899992900,289cyclictest23922-21kworker/u16:4+efi_rts_wq22:55:123
29899992900,288cyclictest25353-21kworker/u16:3+efi_rts_wq19:15:003
29898992900,289cyclictest6736-21kworker/u16:0+efi_rts_wq23:20:132
29897992900,289cyclictest18030-21kworker/u16:2+efi_rts_wq00:25:131
29896992900,289cyclictest25353-21kworker/u16:3+efi_rts_wq22:10:130
29899992890,288cyclictest23922-21kworker/u16:4+efi_rts_wq22:45:123
29899992880,287cyclictest23922-21kworker/u16:4+efi_rts_wq23:05:143
29898992880,287cyclictest3467-21kworker/u16:1+efi_rts_wq21:35:542
29897992880,287cyclictest18030-21kworker/u16:2+efi_rts_wq00:11:091
29896992870,286cyclictest23922-21kworker/u16:4+efi_rts_wq23:55:120
29897992860,285cyclictest25353-21kworker/u16:3+efi_rts_wq20:30:421
29897992850,284cyclictest25353-21kworker/u16:3+efi_rts_wq21:40:531
29896992850,284cyclictest25353-21kworker/u16:3+efi_rts_wq20:10:120
29896992850,284cyclictest18030-21kworker/u16:2+efi_rts_wq00:00:130
29896992840,283cyclictest3467-21kworker/u16:1+efi_rts_wq22:25:130
29896992830,282cyclictest25353-21kworker/u16:3+efi_rts_wq19:40:130
29898992820,281cyclictest6736-21kworker/u16:0+efi_rts_wq23:15:142
29896992820,281cyclictest3467-21kworker/u16:1+efi_rts_wq22:30:140
29897992810,280cyclictest25353-21kworker/u16:3+efi_rts_wq21:30:141
29897992810,280cyclictest23922-21kworker/u16:4+efi_rts_wq23:35:141
29896992810,280cyclictest25353-21kworker/u16:3+efi_rts_wq21:15:150
29896992810,280cyclictest25353-21kworker/u16:3+efi_rts_wq20:30:130
29898992790,278cyclictest3467-21kworker/u16:1+efi_rts_wq21:10:492
29899992770,276cyclictest3467-21kworker/u16:1+efi_rts_wq19:25:143
29898992750,274cyclictest23922-21kworker/u16:4+efi_rts_wq00:20:112
29897992750,274cyclictest25353-21kworker/u16:3+efi_rts_wq19:20:121
29896992720,271cyclictest3467-21kworker/u16:1+efi_rts_wq21:25:520
29896992720,271cyclictest25353-21kworker/u16:3+efi_rts_wq22:20:140
29896992720,271cyclictest25353-21kworker/u16:3+efi_rts_wq22:20:140
29899992710,270cyclictest18030-21kworker/u16:2+efi_rts_wq00:26:133
29898992710,270cyclictest25353-21kworker/u16:3+efi_rts_wq19:50:112
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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