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2026-05-05 - 01:03

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 04, 2026 12:43:53)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
292922348326,4sleep10-21swapper/107:05:321
295072317310,5sleep30-21swapper/307:08:183
293652315308,5sleep20-21swapper/207:06:282
294542314306,5sleep00-21swapper/007:07:350
29903993050,302cyclictest23586-21kworker/u16:3+efi_rts_wq11:00:131
29903993020,299cyclictest31799-21kworker/u16:3+efi_rts_wq08:10:121
29905993000,299cyclictest22923-21kworker/u16:2+efi_rts_wq08:45:143
29905992990,298cyclictest13543-21kworker/u16:3+efi_rts_wq11:58:253
29903992990,298cyclictest15817-21kworker/u16:2+efi_rts_wq12:00:101
29902992980,297cyclictest23586-21kworker/u16:3+efi_rts_wq10:48:140
29902992970,296cyclictest22923-21kworker/u16:2+efi_rts_wq07:50:110
29904992960,295cyclictest22923-21kworker/u16:2+efi_rts_wq10:23:092
29904992960,295cyclictest22923-21kworker/u16:2+efi_rts_wq07:45:132
29903992940,293cyclictest31799-21kworker/u16:3+efi_rts_wq09:35:141
29903992940,293cyclictest26896-21kworker/u16:0+efi_rts_wq12:30:141
29905992930,292cyclictest31799-21kworker/u16:3+efi_rts_wq09:58:033
29904992930,292cyclictest31799-21kworker/u16:3+efi_rts_wq08:10:132
29905992920,291cyclictest22923-21kworker/u16:2+efi_rts_wq10:40:133
29905992920,290cyclictest28614-21kworker/u16:1+efi_rts_wq11:05:143
29905992920,290cyclictest28614-21kworker/u16:1+efi_rts_wq11:05:143
29903992920,291cyclictest31799-21kworker/u16:3+efi_rts_wq10:05:121
29903992920,291cyclictest13543-21kworker/u16:3+efi_rts_wq12:20:121
29902992920,291cyclictest22923-21kworker/u16:2+efi_rts_wq07:17:320
29902992910,290cyclictest22923-21kworker/u16:2+efi_rts_wq08:40:140
29905992900,289cyclictest22923-21kworker/u16:2+efi_rts_wq07:40:123
29904992890,288cyclictest22923-21kworker/u16:2+efi_rts_wq07:55:122
29904992880,287cyclictest31799-21kworker/u16:3+efi_rts_wq08:00:132
29902992870,286cyclictest8592-21kworker/u16:0+efi_rts_wq11:23:190
29905992860,285cyclictest8592-21kworker/u16:0+efi_rts_wq11:28:213
29905992860,285cyclictest31799-21kworker/u16:3+efi_rts_wq09:40:123
29904992860,285cyclictest31799-21kworker/u16:3+efi_rts_wq09:07:542
29903992860,285cyclictest31799-21kworker/u16:3+efi_rts_wq10:15:131
29905992850,284cyclictest22923-21kworker/u16:2+efi_rts_wq09:38:003
29903992840,283cyclictest31799-21kworker/u16:3+efi_rts_wq09:10:131
29903992840,282cyclictest31799-21kworker/u16:3+efi_rts_wq08:50:101
29902992830,282cyclictest8592-21kworker/u16:0+efi_rts_wq11:25:120
29904992820,281cyclictest22923-21kworker/u16:2+efi_rts_wq08:45:142
29905992810,280cyclictest22923-21kworker/u16:2+efi_rts_wq07:35:113
29904992810,280cyclictest23586-21kworker/u16:3+efi_rts_wq10:50:122
29904992810,280cyclictest13543-21kworker/u16:3+efi_rts_wq11:43:232
29903992810,280cyclictest31799-21kworker/u16:3+efi_rts_wq07:15:131
29903992810,280cyclictest13543-21kworker/u16:3+efi_rts_wq11:48:231
29905992800,279cyclictest13543-21kworker/u16:3+efi_rts_wq12:10:133
29904992800,279cyclictest22923-21kworker/u16:2+efi_rts_wq10:45:132
29905992780,277cyclictest23586-21kworker/u16:3+efi_rts_wq11:13:173
29904992780,277cyclictest22923-21kworker/u16:2+efi_rts_wq08:55:122
29902992780,277cyclictest22923-21kworker/u16:2+efi_rts_wq07:27:340
29902992780,277cyclictest13543-21kworker/u16:3+efi_rts_wq12:33:310
29905992760,275cyclictest13543-21kworker/u16:3+efi_rts_wq11:40:113
29904992740,273cyclictest31799-21kworker/u16:3+efi_rts_wq07:12:312
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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