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

Michael S. Tsirkin
2012-04-10T14:58:42Z

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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MST