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2026-03-15 - 16:00

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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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 50 highest latencies:
System rackeslot4s.osadl.org (updated Sun Mar 15, 2026 12:44:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
535472994741,4cyclictest561654-21cp07:35:002
535472994137,3cyclictest562123-21kworker/u8:2+flush-259:007:40:152
535472994036,3cyclictest530081-21kworker/u8:0+flush-259:009:20:142
535472993833,4cyclictest800552-21apt-get11:25:002
535479993733,2cyclictest530081-21kworker/u8:0+flush-259:009:05:153
535479993530,3cyclictest733055-21latency_hist10:20:013
535458993531,3cyclictest748782-21apt-get10:35:120
535462993428,4cyclictest817155-21/usr/sbin/munin11:40:141
535479993229,2cyclictest676556-21kworker/u8:3+flush-259:010:05:213
535479993227,4cyclictest869419-21apt-get12:30:003
535472993228,3cyclictest530081-21kworker/u8:0+events_unbound07:25:162
535462993228,3cyclictest848747-21kworker/u8:0+flush-259:012:20:001
535462993227,4cyclictest875667-21apt-get12:35:111
535462993227,4cyclictest530081-21kworker/u8:0+flush-259:009:20:001
535479993123,6cyclictest676536-21cp09:25:003
535472993128,2cyclictest530081-21kworker/u8:0+flush-259:007:20:232
535458993125,4cyclictest252-21systemd-journal12:30:000
535462993026,3cyclictest561471-21latency_hist07:35:001
535479992925,3cyclictest838002-21kworker/u8:3+events_unbound12:30:243
535479992925,3cyclictest738221-21kworker/u8:3+events_unbound11:15:173
535472992926,2cyclictest822686-21kworker/u8:3+flush-259:011:50:002
535472992926,2cyclictest800758-21kworker/u8:0+events_unbound11:40:142
535472992926,2cyclictest696991-21kworker/u8:1+flush-259:009:50:152
535462992925,3cyclictest670781-21kworker/u8:2+flush-259:009:30:161
535472992825,2cyclictest795228-21kworker/u8:4+flush-259:011:55:182
535472992824,3cyclictest562123-21kworker/u8:2+events_unbound07:55:172
535458992824,2cyclictest562157-21apt-get07:35:110
535458992824,2cyclictest562157-21apt-get07:35:110
535479992724,3cyclictest670781-21kworker/u8:2+flush-259:009:30:233
535479992724,2cyclictest738221-21kworker/u8:3+flush-259:011:10:223
535479992723,3cyclictest795228-21kworker/u8:4+events_unbound11:55:233
535479992723,3cyclictest530081-21kworker/u8:0+flush-259:008:40:243
535472992723,3cyclictest795228-21kworker/u8:4+flush-259:012:15:212
535479992622,2cyclictest676556-21kworker/u8:3+flush-259:009:55:273
535479992621,3cyclictest660703-21apt-get09:10:103
535472992624,2cyclictest676556-21kworker/u8:3+events_unbound09:35:002
535472992623,2cyclictest629162-21kworker/u8:1+events_unbound08:45:142
535472992622,3cyclictest806144-21apt-get11:30:002
535472992622,3cyclictest676556-21kworker/u8:3+flush-259:010:00:252
535472992621,4cyclictest880547-21latency_hist12:40:012
535462992623,2cyclictest759694-21kworker/u8:1+flush-259:010:45:231
535458992622,3cyclictest1655375-21kworker/u8:3+flush-259:007:10:270
535458992620,4cyclictest806151-21latency_hist11:29:590
535458992620,4cyclictest509-21rs:main0
535479992518,5cyclictest252-21systemd-journal08:40:003
535472992522,2cyclictest822072-21kworker/u8:1+flush-259:012:05:232
535472992522,2cyclictest822072-21kworker/u8:1+flush-259:011:55:002
535472992522,2cyclictest562122-21kworker/u8:1+events_unbound07:50:202
535462992521,3cyclictest1655375-21kworker/u8:3+events_unbound07:25:141
535479992421,2cyclictest727880-21kworker/u8:2+flush-259:010:35:263
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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