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

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:

quoted

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@redhat.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

Testing in progress, but the patchset I pointed to enables
zerocopy with bridge.