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2026-09-02 - 18:54

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 20 highest latencies:
System rackeslot4s.osadl.org (updated Wed Sep 02, 2026 12:44:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1998825994033,5cyclictest2207796-21cat10:30:003
1998817993834,3cyclictest2300832-21kworker/u8:1+events_unbound12:00:241
1998817993530,3cyclictest2123900-21cat09:10:011
1998817993329,3cyclictest2264663-21apt-get11:25:121
1998820993127,3cyclictest2034577-21kworker/u8:3+flush-259:007:55:112
1998825993027,2cyclictest2243300-21kworker/u8:3+flush-259:011:20:253
1998825992923,4cyclictest335557-21systemd-journal09:24:593
1998820992923,4cyclictest2331677-21latency_hist12:30:002
1998820992923,4cyclictest2331677-21latency_hist12:30:002
1998820992923,4cyclictest2175253-21ntpq09:55:232
1998817992926,2cyclictest1988759-21kworker/u8:2+flush-259:007:20:241
1998825992823,3cyclictest2150371-21latency_hist09:35:003
1998820992824,3cyclictest2285087-21kworker/u8:3+flush-259:012:15:272
1998817992825,2cyclictest2034577-21kworker/u8:3+flush-259:008:00:151
1998825992724,2cyclictest1988759-21kworker/u8:2+flush-259:007:30:253
1998820992722,4cyclictest1998780-21kworker/u8:1+flush-259:007:15:122
1998825992622,3cyclictest2108390-21kworker/u8:2+flush-259:009:10:243
1998817992623,2cyclictest2249149-21apt-get11:10:121
1998817992622,3cyclictest2331945-21apt-get12:30:121
1998825992522,2cyclictest2191678-21kworker/u8:2+events_unbound10:40:243
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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