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Re: [Xen-devel] [PATCH v4 0/10] skb paged fragment destructors

On Tue, Apr 10, 2012 at 03:26:05PM +0100, Ian Campbell wrote:
>               * I can't for the life of me get anything to actually hit
>                 this code path. I've been trying with an NFS server
>                 running in a Xen HVM domain with emulated (e.g. tap)
>                 networking and a client in domain 0, using the NFS fix
>                 in this series which generates SKBs with destructors
>                 set, so far -- nothing. I suspect that lack of TSO/GSO
>                 etc on the TAP interface is causing the frags to be
>                 copied to normal pages during skb_segment().

To enable gso you need to call TUNSETOFFLOAD.


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