"Michael S. Tsirkin" [off-list ref] wrote on 05/03/2010 08:56:14 AM:

On Mon, May 03, 2010 at 08:39:08AM -0700, David Stevens wrote:

quoted

"Michael S. Tsirkin" [off-list ref] wrote on 05/03/2010 03:34:11 AM:

quoted

On Wed, Apr 28, 2010 at 01:57:12PM -0700, David L Stevens wrote:

quoted

This patch adds mergeable receive buffer support to vhost_net.

Signed-off-by: David L Stevens <redacted>

I've been doing some more testing before sending out a pull
request, and I see a drastic performance degradation in guest to 

host

quoted

quoted

traffic when this is applied but mergeable buffers are not in used
by userspace (existing qemu-kvm userspace).

        Actually, I wouldn't expect it to work at all;
the qemu-kvm
patch (particularly the feature bit setting bug fix) is required.

Which bugfix is that?

        Actually, I see you put that upstream already--
commit dc14a397812b91dd0d48b03d1b8f66a251542369  in
Avi's tree is the one I was talking about.
        I'll look further.

                                                +-DLS