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kgouldsk
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A little extra detail.

The ACPI driver is not balancing interrupts across cpus.  This is very similar to how drivers loaded into the console OS in pre 4.0 days would be bound to cpu0 as the console OS was, and when interrupts were shared with devices such as network or storage requiring access by the kernel, the resulting conflict would bottleneck by only being handled on cpu0.

In this case, in addition to being limited to cpu0, the rate of interrupt generation would appear to be some kind of spurious action. 

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