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2026-07-31 - 03:36

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 Fri Jul 31, 2026 00:43:56)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
69022318304,5sleep00-21swapper/019:07:220
70672317303,4sleep10-21swapper/119:09:321
69552316310,4sleep30-21swapper/319:08:043
67722313307,4sleep20-21swapper/219:05:432
7370993000,298cyclictest19116-21kworker/u16:1+efi_rts_wq22:35:123
7368992970,296cyclictest17324-21kworker/u16:3+efi_rts_wq20:25:121
7367992960,293cyclictest19116-21kworker/u16:1+efi_rts_wq20:30:120
7370992950,294cyclictest27791-21kworker/u16:3+efi_rts_wq00:30:133
7367992950,294cyclictest13958-21kworker/u16:2+efi_rts_wq00:15:120
7367992950,294cyclictest13958-21kworker/u16:2+efi_rts_wq00:05:140
7369992940,293cyclictest19116-21kworker/u16:1+efi_rts_wq21:05:112
7367992940,293cyclictest19116-21kworker/u16:1+efi_rts_wq19:55:140
7367992940,293cyclictest19116-21kworker/u16:1+efi_rts_wq19:30:140
7370992930,292cyclictest17324-21kworker/u16:3+efi_rts_wq21:30:143
7368992930,292cyclictest17324-21kworker/u16:3+efi_rts_wq21:00:141
7367992930,292cyclictest17324-21kworker/u16:3+efi_rts_wq20:50:120
7370992920,291cyclictest27791-21kworker/u16:3+efi_rts_wq23:40:143
7370992920,291cyclictest17324-21kworker/u16:3+efi_rts_wq22:25:123
7369992910,290cyclictest19116-21kworker/u16:1+efi_rts_wq21:15:142
7367992910,290cyclictest19116-21kworker/u16:1+efi_rts_wq21:35:150
7369992900,289cyclictest27791-21kworker/u16:3+efi_rts_wq00:26:062
7367992890,288cyclictest19116-21kworker/u16:1+efi_rts_wq23:35:120
7370992880,287cyclictest17324-21kworker/u16:3+efi_rts_wq21:25:133
7368992870,286cyclictest19116-21kworker/u16:1+efi_rts_wq21:15:141
7368992870,286cyclictest17324-21kworker/u16:3+efi_rts_wq21:20:131
7368992850,284cyclictest27791-21kworker/u16:3+efi_rts_wq00:20:131
7368992850,284cyclictest27791-21kworker/u16:3+efi_rts_wq00:01:021
7367992850,284cyclictest17324-21kworker/u16:3+efi_rts_wq22:05:140
7367992850,284cyclictest17324-21kworker/u16:3+efi_rts_wq22:05:130
7367992840,283cyclictest13958-21kworker/u16:2+efi_rts_wq23:15:130
7367992830,282cyclictest19116-21kworker/u16:1+efi_rts_wq20:40:230
7368992820,281cyclictest27791-21kworker/u16:3+efi_rts_wq00:25:141
7370992800,279cyclictest17324-21kworker/u16:3+efi_rts_wq19:10:053
7368992800,279cyclictest19116-21kworker/u16:1+efi_rts_wq23:30:131
7368992790,277cyclictest17324-21kworker/u16:3+efi_rts_wq20:00:121
7367992790,278cyclictest19116-21kworker/u16:1+efi_rts_wq22:10:410
7367992790,278cyclictest19116-21kworker/u16:1+efi_rts_wq22:10:400
7369992780,277cyclictest17324-21kworker/u16:3+efi_rts_wq19:15:012
7368992770,276cyclictest28660-21kworker/u16:2+efi_rts_wq23:00:501
7368992750,274cyclictest19116-21kworker/u16:1+efi_rts_wq19:15:151
7370992740,273cyclictest28660-21kworker/u16:2+efi_rts_wq22:50:133
7367992740,273cyclictest13958-21kworker/u16:2+efi_rts_wq23:25:140
7368992730,272cyclictest19116-21kworker/u16:1+efi_rts_wq19:55:141
7369992720,271cyclictest19116-21kworker/u16:1+efi_rts_wq23:20:122
7367992710,270cyclictest13958-21kworker/u16:2+efi_rts_wq00:21:050
7370992700,269cyclictest17324-21kworker/u16:3+efi_rts_wq20:10:133
7369992700,269cyclictest17324-21kworker/u16:3+efi_rts_wq19:20:062
7367992690,268cyclictest19116-21kworker/u16:1+efi_rts_wq23:00:160
7367992680,267cyclictest27791-21kworker/u16:3+efi_rts_wq00:11:040
7367992670,266cyclictest19116-21kworker/u16:1+efi_rts_wq23:20:120
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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