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2026-05-11 - 12:08

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, slot #8

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 rack0slot8s.osadl.org (updated Mon May 11, 2026 00:44:42)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
283491890,80ptp4l0-21swapper/119:07:491
94080740,69rtkit-daemon0-21swapper/019:06:220
851827261,9sleep50-21swapper/519:05:357
862226856,10sleep110-21swapper/1119:07:053
788926754,10sleep70-21swapper/719:05:249
875526655,9sleep100-21swapper/1019:09:042
853226554,9sleep60-21swapper/619:05:478
553826554,9sleep40-21swapper/419:05:096
267292500,0sleep70-21swapper/719:30:139
105082490,0sleep333-21ksoftirqd/321:55:255
919599243,16cyclictest0-21swapper/422:55:006
919599242,17cyclictest0-21swapper/423:20:006
921399230,17cyclictest0-21swapper/822:24:5510
919599222,15cyclictest0-21swapper/419:45:016
918699223,11cyclictest0-21swapper/222:30:004
919599211,15cyclictest0-21swapper/423:24:596
918099194,9cyclictest0-21swapper/120:25:011
920499183,9cyclictest0-21swapper/619:15:238
919999185,9cyclictest31304-21kworker/u24:319:15:017
918699184,9cyclictest0-21swapper/222:50:004
918699183,9cyclictest0-21swapper/222:00:254
918699183,10cyclictest0-21swapper/221:20:014
9186991816,1cyclictest25335-21turbostat19:30:014
918099181,16cyclictest0-21swapper/100:05:161
920899171,3cyclictest0-21swapper/721:05:199
918699174,9cyclictest0-21swapper/200:40:004
918699173,10cyclictest0-21swapper/223:55:004
918099173,10cyclictest0-21swapper/121:20:011
62302170,0sleep51009-21runrttasks19:45:147
283491170,0ptp4l0-21swapper/119:45:151
920899164,8cyclictest0-21swapper/720:00:009
920899163,9cyclictest0-21swapper/700:30:009
920899163,8cyclictest0-21swapper/720:25:009
920899163,8cyclictest0-21swapper/719:20:019
920899162,9cyclictest0-21swapper/723:55:239
920499162,8cyclictest0-21swapper/600:00:008
920499161,2cyclictest0-21swapper/619:55:188
918699163,8cyclictest0-21swapper/223:54:594
918699163,8cyclictest0-21swapper/219:45:014
918099164,7cyclictest0-21swapper/121:25:011
918099163,7cyclictest0-21swapper/120:20:001
918099162,9cyclictest0-21swapper/123:15:001
917699162,9cyclictest0-21swapper/019:45:010
283491160,1ptp4l21-21ksoftirqd/121:50:151
283491160,0ptp4l0-21swapper/123:50:211
283491160,0ptp4l0-21swapper/120:45:231
283491160,0ptp4l0-21swapper/100:30:001
921399153,7cyclictest0-21swapper/819:35:0110
921399152,9cyclictest0-21swapper/823:55:0010
920899153,7cyclictest0-21swapper/722:30:259
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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