> I have one machine SMP flooded by network frames, CPU0 handling all

Yes that's the case softirqd is supposed to handle. When you 
spend a significant part of your CPU time in softirq context it kicks
in to provide somewhat fair additional CPU time.

But most systems (like mine) don't do that.

-Andi

-- 
a...@linux.intel.com -- Speaking for myself only.
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