netdev - Re: [PATCH RFC] tun: experimental zero copy tx support

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Message-ID: <20120514095446.3ce307d2@nehalam.linuxnetplumber.net>
Date:	Mon, 14 May 2012 09:54:46 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Joe Perches <joe@...ches.com>,
	Jason Wang <jasowang@...hat.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Ian.Campbell@...rix.com,
	kvm@...r.kernel.org
Subject: Re: [PATCH RFC] tun: experimental zero copy tx support

On Sun, 13 May 2012 18:52:06 +0300
"Michael S. Tsirkin" <mst@...hat.com> wrote:

> +		/* Userspace may produce vectors with count greater than
> +		 * MAX_SKB_FRAGS, so we need to linearize parts of the skb
> +		 * to let the rest of data to be fit in the frags.
> +		 */
Rather than complex partial code, just go through slow path for
requests with too many frags (or for really small requests).
Creating mixed skb's seems too easy to get wrong.
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