"Michael S. Tsirkin" <mst@xxxxxxxxxx> wrote on 05/03/2010 08:56:14 AM:
> On Mon, May 03, 2010 at 08:39:08AM -0700, David Stevens wrote:
> > "Michael S. Tsirkin" <mst@xxxxxxxxxx> wrote on 05/03/2010 03:34:11 AM:
> >
> > > On Wed, Apr 28, 2010 at 01:57:12PM -0700, David L Stevens wrote:
> > > > This patch adds mergeable receive buffer support to vhost_net.
> > > >
> > > > Signed-off-by: David L Stevens <dlstevens@xxxxxxxxxx>
> > >
> > > I've been doing some more testing before sending out a pull
> > > request, and I see a drastic performance degradation in guest to
host
> > > 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
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