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2026-05-07 - 14:51

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 Thu May 07, 2026 00:43:54)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
274382317310,5sleep30-21swapper/319:09:583
273492315302,5sleep00-21swapper/019:08:510
271542315303,9sleep20-21swapper/219:06:202
271432314308,4sleep10-21swapper/119:06:111
27706992990,298cyclictest10550-21kworker/u16:1+efi_rts_wq20:45:132
27704992990,298cyclictest22738-21kworker/u16:1+efi_rts_wq00:11:110
27707992980,297cyclictest15544-21kworker/u16:2+efi_rts_wq23:15:123
27706992980,297cyclictest1430-21kworker/u16:4+efi_rts_wq21:45:112
27704992980,297cyclictest10550-21kworker/u16:1+efi_rts_wq21:04:290
27705992970,294cyclictest25090-21kworker/u16:0+efi_rts_wq00:30:121
27704992960,293cyclictest25090-21kworker/u16:0+efi_rts_wq00:35:120
27704992950,294cyclictest10550-21kworker/u16:1+efi_rts_wq22:09:400
27704992950,294cyclictest10550-21kworker/u16:1+efi_rts_wq19:35:130
27706992940,293cyclictest15544-21kworker/u16:2+efi_rts_wq22:34:462
27705992940,293cyclictest15544-21kworker/u16:2+efi_rts_wq23:40:121
27706992930,292cyclictest1430-21kworker/u16:4+efi_rts_wq20:50:122
27707992900,289cyclictest15544-21kworker/u16:2+efi_rts_wq22:30:133
27706992890,288cyclictest1430-21kworker/u16:4+efi_rts_wq21:00:132
27707992880,287cyclictest1430-21kworker/u16:4+efi_rts_wq22:00:133
27704992870,286cyclictest1430-21kworker/u16:4+efi_rts_wq20:00:110
27707992860,285cyclictest25090-21kworker/u16:0+efi_rts_wq00:26:133
27704992860,285cyclictest1430-21kworker/u16:4+efi_rts_wq20:19:190
27707992840,283cyclictest15544-21kworker/u16:2+efi_rts_wq22:40:123
27707992840,283cyclictest10550-21kworker/u16:1+efi_rts_wq22:15:123
27704992830,282cyclictest1430-21kworker/u16:4+efi_rts_wq21:40:130
27704992830,282cyclictest1430-21kworker/u16:4+efi_rts_wq21:05:130
27704992830,282cyclictest10550-21kworker/u16:1+efi_rts_wq22:19:420
27704992820,281cyclictest1430-21kworker/u16:4+efi_rts_wq21:20:120
27704992820,281cyclictest10550-21kworker/u16:1+efi_rts_wq22:29:450
27704992810,280cyclictest1430-21kworker/u16:4+efi_rts_wq23:30:120
27707992800,279cyclictest15544-21kworker/u16:2+efi_rts_wq23:50:123
27707992800,279cyclictest10550-21kworker/u16:1+efi_rts_wq21:35:123
27706992800,279cyclictest10550-21kworker/u16:1+efi_rts_wq20:30:122
27706992760,275cyclictest1430-21kworker/u16:4+efi_rts_wq21:55:122
27704992760,275cyclictest1430-21kworker/u16:4+efi_rts_wq23:39:590
27704992760,275cyclictest1430-21kworker/u16:4+efi_rts_wq21:55:120
27704992760,274cyclictest15544-21kworker/u16:2+efi_rts_wq23:46:030
27704992750,274cyclictest1430-21kworker/u16:4+efi_rts_wq23:00:120
27707992740,273cyclictest1430-21kworker/u16:4+efi_rts_wq22:05:113
27706992740,273cyclictest22738-21kworker/u16:1+efi_rts_wq00:00:132
27706992740,273cyclictest1430-21kworker/u16:4+efi_rts_wq19:19:042
27705992740,273cyclictest1430-21kworker/u16:4+efi_rts_wq19:30:121
27704992740,272cyclictest15544-21kworker/u16:2+efi_rts_wq22:45:120
27706992730,272cyclictest10550-21kworker/u16:1+efi_rts_wq21:10:122
27707992710,270cyclictest25090-21kworker/u16:0+efi_rts_wq00:30:123
27707992710,270cyclictest10550-21kworker/u16:1+efi_rts_wq19:25:133
27706992710,270cyclictest1430-21kworker/u16:4+efi_rts_wq21:15:132
27707992700,269cyclictest1430-21kworker/u16:4+efi_rts_wq22:55:133
27707992700,269cyclictest10550-21kworker/u16:1+efi_rts_wq19:10:123
27705992700,269cyclictest1430-21kworker/u16:4+efi_rts_wq21:39:341
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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