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

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Date:	Tue, 15 May 2012 11:00:00 -0700
From:	Shirley Ma <mashirle@...ibm.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	"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 Mon, 2012-05-14 at 22:31 +0300, Michael S. Tsirkin wrote:
> On Mon, May 14, 2012 at 09:21:47PM +0200, Eric Dumazet wrote:
> > On Mon, 2012-05-14 at 22:14 +0300, Michael S. Tsirkin wrote:
> > 
> > > They seem to be in net-next, or did I miss something?
> > 
> > Yes, you re-introduce in this patch some bugs already fixed in
> macvtap
> 
> Could explain why I see some problems in testing :)
> Maybe common code should go into net/core?
> I couldn't decide whether the increase in kernel
> size is worth it.

Which problem you hit during testing?

The logic of zerocopy_sg_from_iovec should work well. Jason's fix made
the code more clear.

Thanks
Shirley

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