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Message-ID: <20120410145845.GF19556@redhat.com>
Date: Tue, 10 Apr 2012 17:58:47 +0300
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Ian Campbell <Ian.Campbell@...rix.com>
Cc: netdev@...r.kernel.org, David Miller <davem@...emloft.net>,
Eric Dumazet <eric.dumazet@...il.com>,
Wei Liu <wei.liu2@...rix.com>,
David VomLehn <dvomlehn@...co.com>,
Bart Van Assche <bvanassche@....org>,
xen-devel <xen-devel@...ts.xen.org>
Subject: Re: [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.
--
MST
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