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2026-03-27 - 16:54

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 Fri Mar 27, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811510,0rcu_preempt3-21ksoftirqd/007:39:250
811260,0rcu_preempt19-21ksoftirqd/109:09:051
811220,0rcu_preempt19-21ksoftirqd/107:29:481
811160,0rcu_preempt18075-21dropbear10:59:001
811120,0rcu_preempt3-21ksoftirqd/009:35:560
811110,0rcu_preempt19-21ksoftirqd/112:24:121
811110,0rcu_preempt19-21ksoftirqd/112:14:141
811110,0rcu_preempt19-21ksoftirqd/109:59:121
811070,0rcu_preempt19-21ksoftirqd/109:21:261
811060,0rcu_preempt3-21ksoftirqd/010:24:010
811050,0rcu_preempt3-21ksoftirqd/007:38:200
811050,0rcu_preempt19-21ksoftirqd/109:47:211
811050,0rcu_preempt19-21ksoftirqd/109:47:211
811030,0rcu_preempt3-21ksoftirqd/010:34:030
811030,0rcu_preempt19-21ksoftirqd/108:19:161
811020,0rcu_preempt3-21ksoftirqd/009:14:160
811010,0rcu_preempt19-21ksoftirqd/111:19:071
811010,0rcu_preempt0-21swapper/111:49:121
81990,0rcu_preempt24976-21kworker/0:108:54:140
81980,0rcu_preempt19-21ksoftirqd/111:31:081
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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