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2026-04-11 - 17:28

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 Sat Apr 11, 2026 12:44:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2834911160,107ptp4l0-21swapper/107:06:221
94080890,84rtkit-daemon0-21swapper/1007:06:242
400527361,10sleep110-21swapper/1107:08:113
391127154,9sleep00-21swapper/007:06:470
381227153,7sleep70-21swapper/707:05:299
195926855,10sleep40-21swapper/407:05:156
206626755,9sleep50-21swapper/507:05:167
403826554,9sleep60-21swapper/607:08:308
39102480,0sleep100-21swapper/1008:30:172
469999400,1cyclictest0-21swapper/1011:10:202
469999370,1cyclictest0-21swapper/1007:35:232
466899212,14cyclictest0-21swapper/411:45:006
76112200,1sleep07614-21latency_hist11:25:010
469099173,8cyclictest0-21swapper/810:20:0110
465999172,10cyclictest0-21swapper/212:30:014
283491170,1ptp4l30306-21latency_hist11:55:011
465999163,9cyclictest0-21swapper/208:30:014
39222167,7sleep80-21swapper/807:06:5510
283491160,1ptp4l21-21ksoftirqd/112:00:131
283491160,1ptp4l21-21ksoftirqd/111:10:111
283491160,0ptp4l0-21swapper/111:00:161
470399154,7cyclictest0-21swapper/1107:50:013
470399154,6cyclictest0-21swapper/1109:00:013
470399153,7cyclictest0-21swapper/1110:00:003
470399153,7cyclictest0-21swapper/1110:00:003
470399153,7cyclictest0-21swapper/1107:30:003
470399152,9cyclictest0-21swapper/1109:05:003
467699153,8cyclictest0-21swapper/508:50:017
467699153,7cyclictest0-21swapper/510:30:017
467699153,7cyclictest0-21swapper/509:00:007
467699151,3cyclictest0-21swapper/511:30:187
465999153,8cyclictest0-21swapper/209:25:004
465999152,9cyclictest0-21swapper/208:55:014
283491150,1ptp4l21-21ksoftirqd/110:50:141
283491150,0ptp4l0-21swapper/112:15:191
283491150,0ptp4l0-21swapper/111:20:191
27212150,0sleep60-21swapper/608:30:128
78582140,0sleep20-21swapper/212:05:194
470399142,8cyclictest0-21swapper/1109:20:253
470399140,9cyclictest0-21swapper/1107:15:013
470399140,7cyclictest0-21swapper/1110:30:183
469099143,8cyclictest0-21swapper/811:40:0010
469099142,8cyclictest0-21swapper/812:05:0010
469099142,7cyclictest0-21swapper/811:50:0110
469099142,7cyclictest0-21swapper/808:35:2510
468599143,6cyclictest0-21swapper/710:30:009
468599142,7cyclictest0-21swapper/711:45:009
467699143,7cyclictest0-21swapper/509:30:017
283491140,1ptp4l21-21ksoftirqd/112:25:341
283491140,1ptp4l21-21ksoftirqd/111:45:131
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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