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2026-05-06 - 01:32

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 Tue May 05, 2026 12:43:53)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
6562317310,5sleep00-21swapper/007:07:170
5452316303,4sleep10-21swapper/107:06:061
8612315308,4sleep30-21swapper/307:09:293
5212313306,5sleep20-21swapper/207:05:482
1168992990,298cyclictest10577-21kworker/u16:3+efi_rts_wq07:10:133
1167992980,297cyclictest16033-21kworker/u16:2+efi_rts_wq09:35:142
1167992970,296cyclictest13885-21kworker/u16:1+efi_rts_wq10:15:082
1168992960,295cyclictest16033-21kworker/u16:2+efi_rts_wq09:00:133
1166992960,295cyclictest16033-21kworker/u16:2+efi_rts_wq09:30:121
1165992960,295cyclictest10577-21kworker/u16:3+efi_rts_wq07:40:110
1167992950,294cyclictest13885-21kworker/u16:1+efi_rts_wq08:00:132
1167992940,293cyclictest1905-21kworker/u16:1+efi_rts_wq12:20:132
1167992930,291cyclictest7588-21kworker/u16:0+efi_rts_wq10:40:132
1166992930,292cyclictest29838-21kworker/u16:0+efi_rts_wq12:35:121
1166992920,291cyclictest16033-21kworker/u16:2+efi_rts_wq09:10:121
1166992920,289cyclictest16033-21kworker/u16:2+efi_rts_wq08:35:111
1168992910,290cyclictest13885-21kworker/u16:1+efi_rts_wq08:15:123
1166992910,290cyclictest25003-21kworker/u16:3+efi_rts_wq10:53:021
1166992910,290cyclictest13885-21kworker/u16:1+efi_rts_wq08:15:131
1165992910,290cyclictest7588-21kworker/u16:0+efi_rts_wq10:25:120
1167992890,288cyclictest16033-21kworker/u16:2+efi_rts_wq08:35:112
1166992870,286cyclictest13885-21kworker/u16:1+efi_rts_wq08:40:131
1168992850,284cyclictest7588-21kworker/u16:0+efi_rts_wq10:35:123
1168992850,284cyclictest7588-21kworker/u16:0+efi_rts_wq10:35:113
1167992850,284cyclictest16307-21kworker/u16:3+efi_rts_wq12:15:112
1165992850,284cyclictest16033-21kworker/u16:2+efi_rts_wq09:20:140
1165992830,282cyclictest16033-21kworker/u16:2+efi_rts_wq09:35:130
1167992820,280cyclictest25003-21kworker/u16:3+efi_rts_wq11:00:132
1166992820,281cyclictest13885-21kworker/u16:1+efi_rts_wq08:00:131
1167992810,279cyclictest28946-21kworker/u16:0+efi_rts_wq07:20:132
1165992810,280cyclictest16033-21kworker/u16:2+efi_rts_wq09:45:110
1165992810,280cyclictest13885-21kworker/u16:1+efi_rts_wq11:05:130
1168992800,279cyclictest13885-21kworker/u16:1+efi_rts_wq10:50:123
1166992800,279cyclictest16033-21kworker/u16:2+efi_rts_wq08:30:121
1165992800,279cyclictest16033-21kworker/u16:2+efi_rts_wq08:20:120
1165992790,278cyclictest25003-21kworker/u16:3+efi_rts_wq11:30:130
1168992780,277cyclictest11738-21kworker/u16:2+efi_rts_wq12:03:173
1165992780,277cyclictest16033-21kworker/u16:2+efi_rts_wq09:10:120
1166992770,276cyclictest7588-21kworker/u16:0+efi_rts_wq10:45:121
1167992760,272cyclictest25003-21kworker/u16:3+efi_rts_wq11:10:132
1166992760,275cyclictest13885-21kworker/u16:1+efi_rts_wq11:23:081
1168992750,274cyclictest25003-21kworker/u16:3+efi_rts_wq11:28:093
1166992750,274cyclictest16033-21kworker/u16:2+efi_rts_wq10:05:121
1168992730,272cyclictest16307-21kworker/u16:3+efi_rts_wq12:05:123
1168992730,272cyclictest16033-21kworker/u16:2+efi_rts_wq09:22:453
1166992720,271cyclictest13885-21kworker/u16:1+efi_rts_wq08:55:131
1168992710,270cyclictest7588-21kworker/u16:0+efi_rts_wq10:42:593
1165992700,269cyclictest16033-21kworker/u16:2+efi_rts_wq10:12:550
1168992680,267cyclictest13885-21kworker/u16:1+efi_rts_wq08:45:123
1167992670,266cyclictest16033-21kworker/u16:2+efi_rts_wq07:47:262
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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