Stephen Hemminger writes:
> I also noticed that you really don't save much by doing TX cleaning at
> hardirq, because in hardirq you need to do dev_kfree_irq and that causes
> a softirq (for the routing case where users=1). So when routing it
> doesn't make much difference, both methods cause the softirq delayed
> processing to be invoked. For locally generated packets which are
> cloned, the hardirq will drop the ref count, and that is faster than
> doing the whole softirq round trip.
Right. Also the other way around, repeated ->poll can avoid TX hardirq's.
Cheers.
--ro
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