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2026-04-08 - 19:06

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 Apr 08, 2026 12:43:54)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
160882332309,5sleep20-21swapper/207:09:092
158432319313,4sleep30-21swapper/307:06:023
158462317303,5sleep10-21swapper/107:06:041
16421993140,313cyclictest16811-21kworker/u16:1+efi_rts_wq08:35:133
16421993140,313cyclictest16811-21kworker/u16:1+efi_rts_wq08:35:133
159842314306,5sleep00-21swapper/007:07:470
16420993130,312cyclictest30419-21kworker/u16:4+efi_rts_wq07:55:122
16420993100,309cyclictest16811-21kworker/u16:1+efi_rts_wq08:55:122
16419993100,309cyclictest28445-21kworker/u16:0+efi_rts_wq11:20:111
16419993100,306cyclictest16811-21kworker/u16:1+efi_rts_wq08:45:121
16421993090,308cyclictest16811-21kworker/u16:1+efi_rts_wq10:55:103
16418993080,307cyclictest11925-21kworker/u16:2+efi_rts_wq11:35:120
16421993070,306cyclictest28445-21kworker/u16:0+efi_rts_wq12:37:073
16420993070,306cyclictest30419-21kworker/u16:4+efi_rts_wq07:46:132
16419993060,305cyclictest15119-21kworker/u16:2+efi_rts_wq07:31:091
16418993060,305cyclictest28091-21kworker/u16:0+efi_rts_wq08:00:130
16418993050,304cyclictest30419-21kworker/u16:4+efi_rts_wq09:50:130
16420993020,301cyclictest30419-21kworker/u16:4+efi_rts_wq10:10:122
16421993010,300cyclictest16811-21kworker/u16:1+efi_rts_wq08:46:233
16421993000,299cyclictest16811-21kworker/u16:1+efi_rts_wq10:00:123
16419993000,299cyclictest28091-21kworker/u16:0+efi_rts_wq08:10:131
16421992980,297cyclictest23210-21kworker/u16:1+efi_rts_wq07:25:133
16420992980,297cyclictest30419-21kworker/u16:4+efi_rts_wq08:25:142
16419992970,296cyclictest30419-21kworker/u16:4+efi_rts_wq10:16:411
16418992970,296cyclictest16811-21kworker/u16:1+efi_rts_wq10:31:440
16421992960,293cyclictest16811-21kworker/u16:1+efi_rts_wq09:15:123
16419992960,295cyclictest30419-21kworker/u16:4+efi_rts_wq10:30:121
16419992960,295cyclictest11925-21kworker/u16:2+efi_rts_wq11:46:581
16419992950,294cyclictest30419-21kworker/u16:4+efi_rts_wq09:56:361
16418992950,294cyclictest28091-21kworker/u16:0+efi_rts_wq08:15:110
16419992940,293cyclictest28445-21kworker/u16:0+efi_rts_wq12:25:131
16419992940,293cyclictest16811-21kworker/u16:1+efi_rts_wq11:10:121
16419992940,293cyclictest15119-21kworker/u16:2+efi_rts_wq07:20:111
16421992930,292cyclictest16811-21kworker/u16:1+efi_rts_wq11:25:133
16420992930,292cyclictest16811-21kworker/u16:1+efi_rts_wq09:46:362
16421992920,291cyclictest16811-21kworker/u16:1+efi_rts_wq10:50:113
16419992920,291cyclictest30419-21kworker/u16:4+efi_rts_wq10:21:431
16421992910,290cyclictest16811-21kworker/u16:1+efi_rts_wq11:00:123
16418992910,290cyclictest30419-21kworker/u16:4+efi_rts_wq09:36:320
16421992900,289cyclictest28445-21kworker/u16:0+efi_rts_wq11:50:123
16418992900,289cyclictest15119-21kworker/u16:2+efi_rts_wq07:30:130
16418992890,288cyclictest30419-21kworker/u16:4+efi_rts_wq09:30:120
16419992880,287cyclictest30419-21kworker/u16:4+efi_rts_wq10:05:111
16421992850,284cyclictest28445-21kworker/u16:0+efi_rts_wq11:40:123
16421992850,284cyclictest28091-21kworker/u16:0+efi_rts_wq08:15:133
16421992850,284cyclictest11925-21kworker/u16:2+efi_rts_wq11:55:123
16420992850,284cyclictest16811-21kworker/u16:1+efi_rts_wq10:25:122
16418992850,284cyclictest16811-21kworker/u16:1+efi_rts_wq09:05:130
16418992850,282cyclictest23210-21kworker/u16:1+efi_rts_wq07:25:130
16421992840,283cyclictest30419-21kworker/u16:4+efi_rts_wq09:55:123
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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