RE: [Xen-devel] [PATCH 2/2] netfront skb padding

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> Jumbo frames can be 16k (or possibly larger), that would be 4 
> pages + 1 
> unnecessary page containing the 200 bytes.

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.

> 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
useful. Right now, I can certainly see no downside.

Ian 


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