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

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Message-ID: <1337016890.3851.20.camel@oc3660625478.ibm.com>
Date:	Mon, 14 May 2012 10:34:50 -0700
From:	Shirley Ma <mashirle@...ibm.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Stephen Hemminger <shemminger@...tta.com>,
	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, 2012-05-13 at 18:52 +0300, Michael S. Tsirkin wrote:
> Let vhost-net utilize zero copy tx when the experimental
> zero copy mode is enabled and when used with tun.  This works on
> top of the patchset 'copy aside frags with destructors' that I posted
> previously. This is not using tcp so doesn't have the
> issue with early skb cloning noticed by Ian.
> 
> For those that wish to test this with kvm, I intend to post a patchset
> +
> git tree with just the necessary bits from the destructor patch
> a bit later.
> 
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com> 

Hello Mike,

Have you tested this patch? I think the difference between macvtap and
tap is tap forwarding the packet to bridge. The zerocopy is disabled in
this case.

Shirley

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