usage accounting inconsistencies

[Danial Thom]

When applying a constant load (v1.5.3-PREVIEW),
usage is categorized differently in UP mode than
n SMP model. 

In UP Mode

CPU-0 state:   0.00% user,   0.00% nice,  0.00%
sys,   32.14% intr,  67.86% idle

In SMP mode:

CPU-0 state:   0.00% user,   0.00% nice,  31.27%
sys,   0.00% intr,  68.73% idle
CPU-1 state:   0.00% user,   0.00% nice,   0.00%
sys,   1.56% intr,  98.44% idle

Is this to be expected? It seems to me that if
the handoff to the receive queue marks the end of
interrupt processing in SMP mode (I assume), that
it also should be measured that way in UP mode.
It would be nice if they were the same so one
could get a better handle on the efficiencies or
inefficiencies of the SMP processing.

DT

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