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2025-11-09 - 03:23

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #3

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 rackeslot3s.osadl.org (updated Sat Nov 08, 2025 12:45:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2089374997669,3cyclictest0-21swapper/008:30:030
2089382997028,12cyclictest235-21systemd-journal10:29:262
2089382997028,12cyclictest235-21systemd-journal10:29:262
2089390996630,12cyclictest37-21ksoftirqd/309:20:003
208937799660,45cyclictest0-21swapper/110:55:031
208939099657,11cyclictest37-21ksoftirqd/308:35:013
2089390996335,22cyclictest2102365-21sendmail11:20:013
208939099614,10cyclictest37-21ksoftirqd/307:45:013
2089390995915,4cyclictest131rcu_preempt11:02:263
208939099571,14cyclictest2102292-21latency_hist11:15:023
208939099568,7cyclictest37-21ksoftirqd/311:50:023
208939099562,7cyclictest37-21ksoftirqd/309:50:023
208939099562,7cyclictest37-21ksoftirqd/309:50:013
208939099558,12cyclictest37-21ksoftirqd/310:35:013
2089390995539,12cyclictest235-21systemd-journal08:20:003
208939099551,16cyclictest2095081-21cut09:00:003
208939099547,9cyclictest37-21ksoftirqd/310:10:023
208939099542,12cyclictest37-21ksoftirqd/308:25:023
2089382995437,12cyclictest272-21dbus-daemon07:55:022
208939099536,12cyclictest37-21ksoftirqd/309:40:033
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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