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Date: Mon, 3 May 2010 09:19:41 -0700 From: David Stevens <dlstevens@...ibm.com> To: "Michael S. Tsirkin" <mst@...hat.com> Cc: kvm@...r.kernel.org, netdev@...r.kernel.org, virtualization@...ts.osdl.org Subject: Re: [PATCHv7] add mergeable buffers support to vhost_net "Michael S. Tsirkin" <mst@...hat.com> 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@...hat.com> 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@...ibm.com> > > > > > > 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 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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