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

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Message-ID: <20120516165131.GB10769@redhat.com>
Date:	Wed, 16 May 2012 19:51:32 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Shirley Ma <mashirle@...ibm.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 Wed, May 16, 2012 at 08:16:55AM -0700, Shirley Ma wrote:
> 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

It still fails some tests for me but maybe I'll post the whole
patchset so you can see how it works.
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