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2026-07-19 - 08:48

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 Sun Jul 19, 2026 00:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1714625995148,2cyclictest75-21kswapd023:15:020
1714634994741,4cyclictest335557-21systemd-journal23:35:003
1714629994437,4cyclictest1850298-21latency_hist21:20:001
1714634994136,3cyclictest2016808-21apt-get00:00:123
1714629994037,2cyclictest75-21kswapd023:15:021
1714634993932,5cyclictest1802566-21latency_hist20:35:013
1714634993827,9cyclictest1694703-21kworker/u8:0+flush-259:019:10:013
1714625993833,3cyclictest1735274-21kworker/u8:1+flush-259:020:15:010
1714634993630,4cyclictest335557-21systemd-journal21:18:253
1714625993531,3cyclictest1969536-21gpgv23:14:590
1714625993527,6cyclictest2000146-21ntpq23:40:220
1714632993428,4cyclictest335557-21systemd-journal19:50:012
1714634993228,3cyclictest1735274-21kworker/u8:1+flush-259:019:55:003
1714632993125,4cyclictest1865801-21latency_hist21:35:002
1714629993126,4cyclictest335557-21systemd-journal20:44:241
1714632993025,3cyclictest1756019-21kworker/u8:0+flush-259:020:15:112
1714629993024,4cyclictest1787112-21latency_hist20:20:011
1714625993023,5cyclictest1995878-21latency_hist23:40:000
1714632992917,10cyclictest1777045-21apt-get20:10:142
1714625992926,2cyclictest1855510-21kworker/u8:0+events_unbound22:25:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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