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

From: Michael S. Tsirkin
Date: Mon May 14 2012 - 14:39:48 EST

On Mon, May 14, 2012 at 10:34:50AM -0700, Shirley Ma wrote:
> 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@xxxxxxxxxx>
> 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.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at