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2026-03-15 - 10:39

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #a, slot #5

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.

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 rackaslot5s.osadl.org (updated Sun Mar 15, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811240,0rcu_preempt3-21ksoftirqd/000:19:260
811140,0rcu_preempt3-21ksoftirqd/022:21:500
811070,0rcu_preempt3-21ksoftirqd/022:05:390
811020,0rcu_preempt3-21ksoftirqd/019:49:180
81970,0rcu_preempt3-21ksoftirqd/023:10:180
81960,0rcu_preempt3-21ksoftirqd/023:21:590
81960,0rcu_preempt19-21ksoftirqd/123:19:201
81860,0rcu_preempt3-21ksoftirqd/021:46:540
81770,0rcu_preempt851-21rngd00:09:131
81770,0rcu_preempt851-21rngd00:09:131
81770,0rcu_preempt3-21ksoftirqd/023:54:240
81770,0rcu_preempt3-21ksoftirqd/022:59:500
81770,0rcu_preempt3-21ksoftirqd/022:59:500
81760,0rcu_preempt19-21ksoftirqd/123:49:011
81740,0rcu_preempt54-21kswapd020:01:260
81740,0rcu_preempt3-21ksoftirqd/020:19:090
81730,0rcu_preempt3-21ksoftirqd/022:13:510
81730,0rcu_preempt19-21ksoftirqd/123:08:591
81720,0rcu_preempt3-21ksoftirqd/022:24:160
81720,0rcu_preempt3-21ksoftirqd/022:01:050
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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