netdev - Re: PATCH v2 3/4] Defer skb allocation -- new recvbuf alloc & receive calls

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Date:	Mon, 14 Dec 2009 16:37:15 -0800
From:	Shirley Ma <mashirle@...ibm.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>, Avi Kivity <avi@...hat.com>,
	netdev@...r.kernel.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Anthony Liguori <anthony@...emonkey.ws>
Subject: Re: PATCH v2 3/4] Defer skb allocation -- new recvbuf alloc &
 receive calls

Hello Michael,

On Mon, 2009-12-14 at 14:08 -0800, Shirley Ma wrote:
> > > +
> > > +     err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, 2, skb);
> > > +     if (err < 0)
> > > +             kfree_skb(skb);
> > > +     else
> > > +             skb_queue_head(&vi->recv, skb);
> > 
> > So why are we queueing this still?
> This is for small packet. I didn't change that code since it will
> involve extra copy by using page.

I think I can remove skb link for small packet as well by adding
kfree_skb() in virtio_net_free_bufs for small packet.

Thanks
Shirley

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