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2026-06-29 - 11:36

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 Mon Jun 29, 2026 00:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
667079994844,3cyclictest765937-21gpgv20:45:013
667074994643,2cyclictest677346-21kworker/u8:2+events_unbound19:45:150
667079994540,3cyclictest854629-21latency_hist22:10:003
667074994237,4cyclictest911702-21kworker/u8:0+events_unbound23:40:240
667078993934,3cyclictest807637-21/usr/sbin/munin21:25:152
667078993832,4cyclictest745180-21latency_hist20:25:012
667078993831,5cyclictest335557-21systemd-journal22:09:392
667074993835,2cyclictest797359-21kworker/u8:2+events_unbound21:15:150
667074993834,3cyclictest963504-21kworker/u8:3+events_unbound00:33:340
667074993834,3cyclictest667287-21kworker/u8:1+events_unbound19:15:210
667074993832,4cyclictest729576-21apt-get20:10:120
667074993734,2cyclictest932751-21kworker/u8:2+events_unbound00:35:240
667074993733,3cyclictest890640-21kworker/u8:2+events_unbound23:11:400
667074993733,3cyclictest843953-21kworker/u8:0+events_unbound22:30:170
667074993733,3cyclictest771445-21kworker/u8:0+events_unbound20:55:220
667074993733,3cyclictest739625-21kworker/u8:2+events_unbound20:53:390
667074993633,2cyclictest932751-21kworker/u8:2+events_unbound23:59:390
667074993633,2cyclictest843953-21kworker/u8:0+events_unbound22:50:200
667074993633,2cyclictest771445-21kworker/u8:0+events_unbound21:08:400
667074993633,2cyclictest677346-21kworker/u8:2+events_unbound19:40:220
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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