From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: [PATCHv3 0/6] tun zerocopy support Date: Fri, 20 Jul 2012 17:49:02 -0700 (PDT) Message-ID: <20120720.174902.2055189237500355771.davem@davemloft.net> References: Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: jasowang@redhat.com, eric.dumazet@gmail.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, ebiederm@xmission.com To: mst@redhat.com Return-path: In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org From: "Michael S. Tsirkin" Date: Fri, 20 Jul 2012 22:23:03 +0300 > Same as with macvtap, I get single-percentage wins in CPU utilization > on guest to external from this patchset, and a performance regression on > guest to host, so more work is needed until this feature can move out of > experimental status, but I think it's useful for some people already. > > Pls review and consider for 3.6. It doesn't improve performance in one case, and hurts performance in another. You'll have to give me a more compelling argument than that. You've just given me every reason not to include these patches in 3.6