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2026-06-08 - 07:00

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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Data to construct the above plot have been generated using the RT test utility cyclictest.
Unexpectedly long latencies may be caused by SMIs
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 Mon Jun 08, 2026 00:45:21)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
64804998932,13cyclictest72719-21ssh21:13:530
64804998736,47cyclictest16950irq/224-800000020:20:010
64804997625,47cyclictest12-21ksoftirqd/021:40:340
64804997625,47cyclictest12-21ksoftirqd/021:40:340
64804997527,13cyclictest152672-21ssh00:14:370
64804997516,41cyclictest146180-40mandb00:00:030
64804997516,41cyclictest146180-40mandb00:00:030
6480499744,10cyclictest131rcu_preempt22:50:010
6480499721,42cyclictest91320-21ssh21:55:300
64804997130,14cyclictest275-21dbus-daemon23:59:590
64804997029,9cyclictest12-21ksoftirqd/019:40:020
64804997025,20cyclictest16850irq/134-800000022:30:020
64804996829,11cyclictest12-21ksoftirqd/023:46:460
6480499673,4cyclictest131rcu_preempt00:40:000
64812996610,15cyclictest99531-21ssh22:14:211
64804996521,9cyclictest74287-21ssh21:17:150
64812996421,8cyclictest23-21ksoftirqd/121:30:011
6480499641,9cyclictest79409-21ssh21:28:580
64821996331,13cyclictest37-21ksoftirqd/300:00:023
6480499635,41cyclictest70987-21diskmemload22:35:020
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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