linux-kernel - Re: [PATCH net-next] virtio-net: avoid unnecessary sg initialzation

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Date:	Thu, 27 Aug 2015 15:52:10 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jasowang@...hat.com
Cc:	mst@...hat.com, virtualization@...ts.linux-foundation.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] virtio-net: avoid unnecessary sg initialzation

From: Jason Wang <jasowang@...hat.com>
Date: Thu, 27 Aug 2015 14:53:06 +0800

> Usually an skb does not have up to MAX_SKB_FRAGS frags. So no need to
> initialize the unuse part of sg. This patch initialize the sg based on
> the real number it will used:
> 
> - during xmit, it could be inferred from nr_frags and can_push.
> - for small receive buffer, it will also be 2.
> 
> Cc: Michael S. Tsirkin <mst@...hat.com>
> Signed-off-by: Jason Wang <jasowang@...hat.com>

This looks fine, thanks Jason.
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