> 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.
Dom0 may want to put extra headers on the *front* of the packet. By
having the packet starting a fair way in to the data area of the skb it
should be possible to add them in the same data area rather than create
pre-pend another fragement.
Anyhow, the current situation doesn''t really waste any memory because
skb data areas are all whole pages.
Ian
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