From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755871Ab1GGLIv (ORCPT ); Thu, 7 Jul 2011 07:08:51 -0400 Received: from shards.monkeyblade.net ([198.137.202.13]:41514 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755664Ab1GGLIt (ORCPT ); Thu, 7 Jul 2011 07:08:49 -0400 Date: Thu, 07 Jul 2011 04:08:40 -0700 (PDT) Message-Id: <20110707.040840.809661052978541081.davem@davemloft.net> To: mashirle@us.ibm.com Cc: mst@redhat.com, netdev@vger.kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH V8 0/4 net-next] macvtap/vhost TX zero-copy support From: David Miller In-Reply-To: <1309990525.10209.12.camel@localhost.localdomain> References: <1309990525.10209.12.camel@localhost.localdomain> X-Mailer: Mew version 6.3 on Emacs 23.2 / Mule 6.0 (HANACHIRUSATO) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.2.6 (shards.monkeyblade.net [198.137.202.13]); Thu, 07 Jul 2011 04:08:41 -0700 (PDT) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Shirley Ma Date: Wed, 06 Jul 2011 15:15:25 -0700 > This patchset add supports for TX zero-copy between guest and host > kernel through vhost. It significantly reduces CPU utilization on the > local host on which the guest is located (It reduced about 50% CPU usage > for single stream test on the host, while 4K message size BW has > increased about 50%). The patchset is based on previous submission and > comments from the community regarding when/how to handle guest kernel > buffers to be released. This is the simplest approach I can think of > after comparing with several other solutions. > > This patchset has integrated V3 review comments from community: I'm personally fine with this patch set. Unless there are others who object, please fix the use-after-free bug I reported, respin the patch set, and I'll apply it. Thanks.