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2026-08-11 - 04:58

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 Tue Aug 11, 2026 00:44:44)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2834911160,59ptp4l0-21swapper/119:07:451
2834911160,59ptp4l0-21swapper/119:07:451
94080960,91rtkit-daemon0-21swapper/019:06:430
94080960,91rtkit-daemon0-21swapper/019:06:430
2778926756,9sleep110-21swapper/1119:06:293
2778926756,9sleep110-21swapper/1119:06:293
2788626252,8sleep100-21swapper/1019:07:522
2788626252,8sleep100-21swapper/1019:07:522
2785526243,9sleep70-21swapper/719:07:259
2785526243,9sleep70-21swapper/719:07:249
2786626151,8sleep50-21swapper/519:07:357
2786626151,8sleep50-21swapper/519:07:347
2786725543,10sleep60-21swapper/619:07:368
2786725543,10sleep60-21swapper/619:07:358
2687325544,8sleep40-21swapper/419:05:226
2687325544,8sleep40-21swapper/419:05:216
40552500,0sleep60-21swapper/620:40:208
146422490,0sleep20-21swapper/223:00:184
2837499232,7cyclictest0-21swapper/423:40:006
2837499212,14cyclictest0-21swapper/420:00:016
28401991918,1cyclictest0-21swapper/1020:32:182
2839699195,8cyclictest0-21swapper/920:30:0111
2838399193,10cyclictest0-21swapper/621:20:018
2836899192,10cyclictest0-21swapper/300:39:595
2835199193,9cyclictest0-21swapper/021:25:010
2838799181,3cyclictest0-21swapper/723:05:179
2835599173,9cyclictest0-21swapper/121:25:231
2835599173,8cyclictest0-21swapper/120:30:011
283491170,1ptp4l21-21ksoftirqd/123:35:111
2839699163,9cyclictest0-21swapper/920:50:0111
2838799163,7cyclictest0-21swapper/722:50:009
2838399162,9cyclictest0-21swapper/621:50:018
2837899162,9cyclictest0-21swapper/519:35:017
2836899163,8cyclictest0-21swapper/321:05:015
2836899162,9cyclictest0-21swapper/320:20:015
2835599163,7cyclictest0-21swapper/122:30:001
2835199164,7cyclictest0-21swapper/019:45:010
2835199164,7cyclictest0-21swapper/000:15:000
2835199163,8cyclictest0-21swapper/000:15:000
2835199162,8cyclictest0-21swapper/019:20:000
283491160,4ptp4l21-21ksoftirqd/123:54:131
283491160,1ptp4l21-21ksoftirqd/120:35:161
283491160,1ptp4l21-21ksoftirqd/119:30:191
283491160,0ptp4l0-21swapper/123:15:271
279102167,7sleep80-21swapper/819:08:1410
279102167,7sleep80-21swapper/819:08:1410
2840999152,8cyclictest0-21swapper/1122:40:003
2838799153,7cyclictest0-21swapper/719:25:009
2838799152,8cyclictest0-21swapper/721:50:019
2838799151,10cyclictest10209-21kworker/u24:221:05:019
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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