From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S270287AbTGMQn3 (ORCPT ); Sun, 13 Jul 2003 12:43:29 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S270283AbTGMQn3 (ORCPT ); Sun, 13 Jul 2003 12:43:29 -0400 Received: from parcelfarce.linux.theplanet.co.uk ([195.92.249.252]:16052 "EHLO www.linux.org.uk") by vger.kernel.org with ESMTP id S270281AbTGMQn1 (ORCPT ); Sun, 13 Jul 2003 12:43:27 -0400 Message-ID: <3F118F99.1020104@pobox.com> Date: Sun, 13 Jul 2003 12:58:01 -0400 From: Jeff Garzik Organization: none User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.2.1) Gecko/20021213 Debian/1.2.1-2.bunk X-Accept-Language: en MIME-Version: 1.0 To: Alan Cox CC: Roland Dreier , "David S. Miller" , Alan Shih , Linux Kernel Mailing List , linux-net@vger.kernel.org, netdev@oss.sgi.com Subject: Re: TCP IP Offloading Interface References: <20030713004818.4f1895be.davem@redhat.com> <52u19qwg53.fsf@topspin.com> <1058113895.554.7.camel@dhcp22.swansea.linux.org.uk> In-Reply-To: <1058113895.554.7.camel@dhcp22.swansea.linux.org.uk> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Alan Cox wrote: > Finally if you are streaming objects by non mapped references (eg > sendfile or see LM's paper from long ago on splice()) then the problem > goes away. As an aside, I really like sendfile's semantics except for * People occasionally want to add a receivefile(2). I disagree... sendfile(2) interface should be really be considered a universal "fdcopy" interface, regardless of what the 'to' and 'from' file descriptors are attached to. File to socket. Socket to file. File to file. socket to socket. All should be supported, even if the fallback is a stupid (but small!) in-kernel copy loop. * Copy-until-EOF semantics are either undefined, or, unclear to me personally. Jeff