Hi, Tony >> Resolve it by increasing NET_SKB_NET from the default value 16 to 18. > >Typo? You mean NET_SKB_PAD here? > I think so. :-) >But in include/linux/skbuff.h it says: "It must be a power of 2". > >Explain why 18 is ok. It's supposed to add NET_IP_ALIGN when network driver allocs skb with netdev_alloc_skb(). For example, e1000 do like the below, too. struct sk_buff *new_skb = netdev_alloc_skb(netdev, length + NET_IP_ALIGN); In the case of xen, xen-frontend.c also uses __netdev_alloc_skb(), so we need to add 16 + NET_IP_ALIGN for padding. I think we use NET_SKB_PAD=16+NET_IP_ALIGN or we add it to length of __netdev_alloc_skb(). The below is my patch being relative to this. http://xenbits.xensource.com/xen-unstable.hg?cs=797430d25f1b Best Regards, Akio Takebe _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/virtualization
