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2026-07-01 - 07:00

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #4

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.

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rackeslot4s.osadl.org (updated Wed Jul 01, 2026 00:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2875726994943,4cyclictest2979188-21latency_hist20:50:012
2875719994439,3cyclictest335557-21systemd-journal22:20:090
2875726994137,3cyclictest3083021-21gpgv22:30:012
2875723994135,4cyclictest3145709-21latency_hist23:30:011
2875719994024,14cyclictest3214577-21latency_hist00:40:010
2875730993734,2cyclictest2891090-21kworker/u8:3+flush-259:020:00:013
2875730993734,2cyclictest2880346-21kworker/u8:2+flush-259:019:40:003
2875719993428,5cyclictest2989784-21kworker/u8:0+flush-259:021:55:260
2875726993023,5cyclictest3192548-21ntpq00:15:212
2875730992822,4cyclictest2900558-21ntpq19:30:223
2875726992822,4cyclictest2989558-21latency_hist21:00:002
2875723992815,3cyclictest335557-21systemd-journal23:45:101
2875723992813,5cyclictest3004248-21ntpq21:10:221
2875719992823,4cyclictest3156352-21diskstats23:40:130
2875723992721,5cyclictest3209152-21cp00:35:011
2875719992722,4cyclictest2937884-21latency_hist20:10:010
2875730992622,3cyclictest2891090-21kworker/u8:3+flush-259:019:25:183
2875726992623,2cyclictest2901422-21kworker/u8:0+flush-259:019:40:182
2875719992621,4cyclictest2967978-21ntpq20:35:200
2875719992612,3cyclictest3204053-21apt-get00:30:120
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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