On Mon, 2015-04-13 at 14:46 +0100, David Vrabel wrote: > > And the proof-of-concept patch for idea (b) I used was: > > > > @@ -552,6 +552,8 @@ static int xennet_start_xmit(struct sk_buff *skb, > > struct net_device *dev) > > goto drop; > > } > > > > + skb_orphan(skb); > > + > > page = virt_to_page(skb->data); > > offset = offset_in_page(skb->data); > > len = skb_headlen(skb); > > No. This a bunch of allocations and a full memcpy of all the frags.
skb_orphan() does nothing like that. But the main concern here is it basically breaks back pressure. And you do not want this, unless there is no other choice. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
