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2026-04-07 - 16:35

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #6

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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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 rackeslot6s.osadl.org (updated Tue Apr 07, 2026 12:44:50)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
36466249910611,5cyclictest3673233-21apt-get09:45:013
364662499827,11cyclictest3647441-21munin-node07:15:013
364662199731,24cyclictest24-21ksoftirqd/108:55:181
3646621997110,22cyclictest3681959-21/usr/sbin/munin10:35:201
3646618996761,4cyclictest131ktimers/007:35:010
3646618996761,4cyclictest131ktimers/007:35:010
364661899671,4cyclictest0-21swapper/007:50:010
3646621995724,13cyclictest0-21swapper/108:25:011
3646622995616,11cyclictest3663297-21/usr/sbin/munin08:45:202
364662299551,27cyclictest30-21rcuc/210:20:022
364661899541,42cyclictest3648889-21sh07:20:190
3646618995342,7cyclictest0-21swapper/009:50:010
3646618995342,7cyclictest0-21swapper/009:50:010
364662299522,14cyclictest3657837-21apt-get08:15:012
3646622995137,8cyclictest0-21swapper/211:30:282
3646622995033,8cyclictest0-21swapper/209:55:272
364662199502,3cyclictest0-21swapper/111:20:011
364662199502,13cyclictest24-21ksoftirqd/107:20:011
3646621994929,8cyclictest0-21swapper/107:45:001
3646618994940,4cyclictest167350irq/118-8000000.ethernet-tx011:40:160
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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