>> I can implement one solution by copying the received packets into skb's
>> with the correct length, but that eliminates the performance gains from
>> simply swapping buffers around (and would definately mean no
zero-copy).
> Generally it is a win to copy rather than swap buffers when the frame
does
> not occupy most of the buffer. Most traffic is very small or MTU sized
> frames (and on TR of course ethernet not TR mtu frames are popular)
Any suggestions on heuristics for this ?
Say maybe copy if skb->len <= eth_max_mtu, skb->len <= skb->truesize * .5,
or just copy the packets no matter what size.
Mike
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