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2026-05-25 - 06:13

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 25, 2026 00:43:55)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
167432319311,5sleep30-21swapper/319:06:483
169542315309,4sleep20-21swapper/219:09:292
166492315307,5sleep10-21swapper/119:05:351
166382313305,5sleep00-21swapper/019:05:260
17260992990,298cyclictest14876-21kworker/u16:3+efi_rts_wq22:45:131
17260992990,298cyclictest14876-21kworker/u16:3+efi_rts_wq19:19:221
17261992980,297cyclictest14876-21kworker/u16:3+efi_rts_wq20:50:132
17260992970,296cyclictest5475-21kworker/u16:3+efi_rts_wq00:25:101
17261992960,295cyclictest10350-21kworker/u16:0+efi_rts_wq21:25:122
17262992950,293cyclictest13730-21kworker/u16:2+efi_rts_wq23:25:113
17259992950,294cyclictest14876-21kworker/u16:3+efi_rts_wq20:20:110
17262992940,293cyclictest13730-21kworker/u16:2+efi_rts_wq23:30:143
17262992940,293cyclictest10350-21kworker/u16:0+efi_rts_wq20:49:383
17259992940,293cyclictest14876-21kworker/u16:3+efi_rts_wq22:35:130
17261992930,292cyclictest26733-21kworker/u16:0+efi_rts_wq23:40:132
17260992930,292cyclictest5475-21kworker/u16:3+efi_rts_wq00:01:101
17260992930,292cyclictest14876-21kworker/u16:3+efi_rts_wq19:30:121
17261992910,289cyclictest14876-21kworker/u16:3+efi_rts_wq23:10:122
17261992900,289cyclictest7765-21kworker/u16:1+efi_rts_wq00:00:142
17260992900,289cyclictest24376-21kworker/u16:1+efi_rts_wq19:10:131
17261992890,288cyclictest14876-21kworker/u16:3+efi_rts_wq22:25:122
17259992870,286cyclictest10350-21kworker/u16:0+efi_rts_wq21:30:120
17262992860,285cyclictest14876-21kworker/u16:3+efi_rts_wq20:40:133
17259992860,285cyclictest7765-21kworker/u16:1+efi_rts_wq23:55:110
17262992830,282cyclictest14876-21kworker/u16:3+efi_rts_wq19:40:113
17260992830,282cyclictest14876-21kworker/u16:3+efi_rts_wq20:00:111
17260992820,281cyclictest26733-21kworker/u16:0+efi_rts_wq23:35:141
17260992820,281cyclictest14876-21kworker/u16:3+efi_rts_wq21:39:491
17262992810,280cyclictest24376-21kworker/u16:1+efi_rts_wq20:04:293
17259992810,280cyclictest14876-21kworker/u16:3+efi_rts_wq21:49:500
17259992810,280cyclictest13730-21kworker/u16:2+efi_rts_wq23:35:090
17262992800,279cyclictest5475-21kworker/u16:3+efi_rts_wq23:45:123
17260992780,277cyclictest14876-21kworker/u16:3+efi_rts_wq21:29:471
17262992770,276cyclictest14876-21kworker/u16:3+efi_rts_wq19:15:003
17261992770,276cyclictest14876-21kworker/u16:3+efi_rts_wq19:20:122
17259992770,276cyclictest7765-21kworker/u16:1+efi_rts_wq00:20:130
17259992770,275cyclictest10350-21kworker/u16:0+efi_rts_wq21:40:110
17260992750,273cyclictest5475-21kworker/u16:3+efi_rts_wq23:45:111
17260992740,273cyclictest10350-21kworker/u16:0+efi_rts_wq22:15:131
17260992740,273cyclictest10350-21kworker/u16:0+efi_rts_wq22:15:121
17259992740,273cyclictest13730-21kworker/u16:2+efi_rts_wq23:10:120
17260992730,272cyclictest13730-21kworker/u16:2+efi_rts_wq23:30:141
17259992730,272cyclictest10350-21kworker/u16:0+efi_rts_wq22:15:130
17259992730,272cyclictest10350-21kworker/u16:0+efi_rts_wq22:15:120
17260992710,270cyclictest7765-21kworker/u16:1+efi_rts_wq23:50:121
17260992710,270cyclictest13730-21kworker/u16:2+efi_rts_wq23:20:121
17259992700,269cyclictest14876-21kworker/u16:3+efi_rts_wq22:09:540
17262992680,267cyclictest14876-21kworker/u16:3+efi_rts_wq19:35:133
17262992680,267cyclictest10350-21kworker/u16:0+efi_rts_wq21:40:113
17260992670,266cyclictest10350-21kworker/u16:0+efi_rts_wq22:39:591
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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