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2025-12-02 - 09:08

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 Tue Dec 02, 2025 00:43:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811090,0rcu_preempt19-21ksoftirqd/122:38:251
811050,0rcu_preempt19-21ksoftirqd/119:39:451
811030,0rcu_preempt19-21ksoftirqd/123:33:141
811000,0rcu_preempt751-21rngd23:14:541
81950,0rcu_preempt19-21ksoftirqd/121:49:411
81940,0rcu_preempt19-21ksoftirqd/100:29:061
81930,0rcu_preempt19-21ksoftirqd/122:13:561
81930,0rcu_preempt19-21ksoftirqd/100:33:201
81920,0rcu_preempt54-21kswapd022:19:401
81920,0rcu_preempt19-21ksoftirqd/100:38:121
81920,0rcu_preempt19-21ksoftirqd/100:24:071
81910,0rcu_preempt751-21rngd00:16:461
81910,0rcu_preempt19-21ksoftirqd/121:22:291
81910,0rcu_preempt19-21ksoftirqd/100:11:161
81900,0rcu_preempt19-21ksoftirqd/123:01:041
81890,0rcu_preempt19-21ksoftirqd/122:18:091
81890,0rcu_preempt0-21swapper/100:02:451
81880,0rcu_preempt19-21ksoftirqd/121:42:421
81870,0rcu_preempt54-21kswapd021:13:531
81870,0rcu_preempt19-21ksoftirqd/122:26:061
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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