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2026-07-14 - 22:15

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, slot #2

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 rack7slot2s.osadl.org (updated Tue Jul 14, 2026 12:48:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
31043499270180,75cyclictest315202-21grep07:36:550
31043499270180,75cyclictest315202-21grep07:36:540
31043499270178,61cyclictest171rcu_preempt11:09:550
31043499269181,73cyclictest310409-21kworker/u10:0+flush-0:4507:25:420
31043499269181,73cyclictest310409-21kworker/u10:0+flush-0:4507:25:420
31043499269151,74cyclictest326278-21kworker/u10:7-rpciod08:45:020
31043499261186,63cyclictest0-21swapper/011:19:020
31043499261186,63cyclictest0-21swapper/011:19:010
31043499259180,61cyclictest370989-21ntpq12:16:290
31043499259180,61cyclictest370989-21ntpq12:16:290
31043499258201,43cyclictest9150irq/87-eth%d11:30:580
31043499258201,43cyclictest9150irq/87-eth%d11:30:570
31043499258162,63cyclictest171rcu_preempt10:56:140
31043499258162,63cyclictest171rcu_preempt10:56:140
31043499257166,64cyclictest171rcu_preempt12:08:030
31043499255167,74cyclictest335114-21diskstats09:30:390
31043499255167,74cyclictest335114-21diskstats09:30:390
31043499254180,59cyclictest339066-21kworker/u9:2+rpciod10:00:040
31043499253177,61cyclictest364463-21ssh11:46:090
31043499253162,61cyclictest171rcu_preempt07:10:160
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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