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

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Message-ID: <1337181415.10741.18.camel@oc3660625478.ibm.com>
Date:	Wed, 16 May 2012 08:16:55 -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 Mon, 2012-05-14 at 21:39 +0300, Michael S. Tsirkin wrote:
> > 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
> 
> Testing in progress, but the patchset I pointed to enables
> zerocopy with bridge. 

Hello Mike,

You meant this patch or another patchset for enabling bridge zerocopy?

I remembered we disabled forward skb zerocopy since the user space
program might hold the buffers too long or forever.

In tap/bridge case, when the tx buffers will be released?

Thanks
Shirley

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