[...]> Jumbo frames are a completely different ball game. Ideally you''d
want to
> get the headers seperated off and have the actual data units page
> aligned.
That would require a fair amount of knowledge about the packet, which I would
argue is not the place of the virtual device driver (though it might be for
netback). But, better cross that bridge when we come to it.
> > Sure, but we only have 1 layer (not the 9 that we have room
> > for). All other
> > layers would be encapsulated inside the data of the skb (or am I not
> > understanding the problem correctly).
>
> Other layers of headers and encapsulation could get added when the
> packet arrives in the backend, so having a generous headroom may be
How could their be more than one layer of encapsulation greater than MTU?
When the packet comes into dom0, it is already <= MTU. It gets encapsulated
with another layer of routing data, and sent to its destination. So, it is
at maximum size MTU+24.
> useful. Right now, I can certainly see no downside.
<Shaking fist in air> It is wasteful!!!! </shaking fist in air>
But, if it
doesn''t matter to you, then I''ll move on to something else.
--
Jon Mason
jdmason@us.ibm.com
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