[Xen-devel] question about rx_flip in netback

["Zang Hongyong" <zanghongyong@xxxxxxxxxx>]

hi
In netback netif_be_start_xmit() 
        if (!netif->copying_receiver ||
            ((skb_headlen(skb) + offset_in_page(skb->data)) >= PAGE_SIZE)) {
                struct sk_buff *nskb = netbk_copy_skb(skb);
which calls skb_copy_bits()

it means when rx-flip, the skb data and frags are copied to another buffer. 
then the buffer flip with domU's pages.
so before page flip with domU, copying happens in dom0. Does rx-flip make any 
sense?


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