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2026-05-07 - 01:35

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 May 06, 2026 12:43:54)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
289742325318,5sleep30-21swapper/307:05:523
291722317310,4sleep10-21swapper/107:08:231
291262317305,4sleep20-21swapper/207:07:482
290572317306,9sleep00-21swapper/007:06:530
29561993000,297cyclictest24899-21kworker/u16:3+efi_rts_wq08:20:120
29561992990,298cyclictest1548-21kworker/u16:1+efi_rts_wq12:22:480
29561992980,297cyclictest32436-21kworker/u16:2+efi_rts_wq08:50:120
29564992970,295cyclictest24899-21kworker/u16:3+efi_rts_wq09:05:123
29564992960,295cyclictest32436-21kworker/u16:2+efi_rts_wq09:50:113
29563992940,293cyclictest1548-21kworker/u16:1+efi_rts_wq11:55:122
29562992940,293cyclictest32436-21kworker/u16:2+efi_rts_wq09:00:121
29561992920,291cyclictest7306-21kworker/u16:3+efi_rts_wq11:25:110
29564992910,290cyclictest32436-21kworker/u16:2+efi_rts_wq10:47:313
29561992910,290cyclictest4499-21kworker/u16:2+efi_rts_wq11:12:360
29564992900,289cyclictest32436-21kworker/u16:2+efi_rts_wq09:30:123
29563992900,289cyclictest24899-21kworker/u16:3+efi_rts_wq09:47:222
29564992870,286cyclictest24899-21kworker/u16:3+efi_rts_wq10:40:133
29561992870,286cyclictest7306-21kworker/u16:3+efi_rts_wq11:40:120
29561992870,284cyclictest7306-21kworker/u16:3+efi_rts_wq12:25:110
29564992860,285cyclictest1548-21kworker/u16:1+efi_rts_wq12:00:133
29563992840,283cyclictest24899-21kworker/u16:3+efi_rts_wq08:20:132
29563992840,282cyclictest32436-21kworker/u16:2+efi_rts_wq08:35:122
29562992830,282cyclictest32436-21kworker/u16:2+efi_rts_wq08:40:121
29561992830,282cyclictest7306-21kworker/u16:3+efi_rts_wq11:45:130
29564992820,281cyclictest32436-21kworker/u16:2+efi_rts_wq07:50:133
29561992820,281cyclictest24899-21kworker/u16:3+efi_rts_wq09:15:130
29562992810,279cyclictest32436-21kworker/u16:2+efi_rts_wq10:45:131
29561992810,280cyclictest24899-21kworker/u16:3+efi_rts_wq10:20:130
29564992800,279cyclictest24899-21kworker/u16:3+efi_rts_wq07:55:123
29564992800,279cyclictest24899-21kworker/u16:3+efi_rts_wq07:55:123
29562992790,278cyclictest32436-21kworker/u16:2+efi_rts_wq09:35:131
29562992790,278cyclictest32436-21kworker/u16:2+efi_rts_wq08:45:111
29563992780,277cyclictest32436-21kworker/u16:2+efi_rts_wq08:52:102
29562992780,277cyclictest24899-21kworker/u16:3+efi_rts_wq07:31:551
29561992780,277cyclictest32436-21kworker/u16:2+efi_rts_wq10:55:110
29562992770,276cyclictest7306-21kworker/u16:3+efi_rts_wq11:35:131
29561992770,276cyclictest7306-21kworker/u16:3+efi_rts_wq12:05:130
29562992750,273cyclictest1548-21kworker/u16:1+efi_rts_wq11:30:121
29564992730,272cyclictest23621-21kworker/u16:0+efi_rts_wq10:52:313
29563992730,272cyclictest32436-21kworker/u16:2+efi_rts_wq10:15:132
29564992720,271cyclictest32436-21kworker/u16:2+efi_rts_wq08:42:093
29563992720,271cyclictest24899-21kworker/u16:3+efi_rts_wq08:10:112
29561992720,271cyclictest24899-21kworker/u16:3+efi_rts_wq08:00:130
29563992710,270cyclictest32436-21kworker/u16:2+efi_rts_wq10:25:102
29562992710,270cyclictest32436-21kworker/u16:2+efi_rts_wq11:00:121
29562992710,270cyclictest32436-21kworker/u16:2+efi_rts_wq10:25:091
29563992690,267cyclictest23621-21kworker/u16:0+efi_rts_wq11:05:122
29564992680,267cyclictest32436-21kworker/u16:2+efi_rts_wq08:05:113
29562992680,267cyclictest24899-21kworker/u16:3+efi_rts_wq10:20:121
29562992680,267cyclictest24899-21kworker/u16:3+efi_rts_wq07:40:121
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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