netdev - Re: [PATCH v2 2/2] virtio_net: Defer skb allocation in receive path

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Message-Id: <201001170801.12721.rusty@rustcorp.com.au>
Date:	Sun, 17 Jan 2010 08:01:12 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Shirley Ma <mashirle@...ibm.com>
Cc:	"Michael S. Tsirkin" <mst@...hat.com>,
	Amit Shah <amit.shah@...hat.com>, Avi Kivity <avi@...hat.com>,
	netdev@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH v2 2/2] virtio_net: Defer skb allocation in receive path

On Thu, 14 Jan 2010 07:23:38 am Shirley Ma wrote:
> virtio_net receives packets from its pre-allocated vring buffers, then it 
> delivers these packets to upper layer protocols as skb buffs. So it's not
> necessary to pre-allocate skb for each mergable buffer, then frees extra 
> skbs when buffers are merged into a large packet. This patch has deferred 
> skb allocation in receiving packets for both big packets and mergeable buffers
> to reduce skb pre-allocations and skb frees. It frees unused buffers by calling 
> detach_unused_buf in vring, so recv skb queue is not needed.
> 
> Signed-off-by: Shirley Ma <xma@...ibm.com>

Thanks, applied!

After testing I'll send it to DaveM.

Rusty.
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