From owner-freebsd-net@FreeBSD.ORG Tue Aug 1 13:37:24 2006 Return-Path: X-Original-To: net@FreeBSD.org Delivered-To: freebsd-net@FreeBSD.ORG Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 526AE16A504; Tue, 1 Aug 2006 13:37:24 +0000 (UTC) (envelope-from gallatin@cs.duke.edu) Received: from duke.cs.duke.edu (duke.cs.duke.edu [152.3.140.1]) by mx1.FreeBSD.org (Postfix) with ESMTP id D976243D4C; Tue, 1 Aug 2006 13:37:23 +0000 (GMT) (envelope-from gallatin@cs.duke.edu) Received: from grasshopper.cs.duke.edu (grasshopper.cs.duke.edu [152.3.145.30]) by duke.cs.duke.edu (8.13.6/8.13.6) with ESMTP id k71DbNX7011165 (version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=NO); Tue, 1 Aug 2006 09:37:23 -0400 (EDT) Received: (from gallatin@localhost) by grasshopper.cs.duke.edu (8.12.9p2/8.12.9/Submit) id k71DbI1c061075; Tue, 1 Aug 2006 09:37:18 -0400 (EDT) (envelope-from gallatin) From: Andrew Gallatin MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <17615.22798.24602.160771@grasshopper.cs.duke.edu> Date: Tue, 1 Aug 2006 09:37:18 -0400 (EDT) To: Robert Watson In-Reply-To: <20060801142056.C64452@fledge.watson.org> References: <20060730141642.D16341@fledge.watson.org> <17615.19420.172545.986872@grasshopper.cs.duke.edu> <20060801142056.C64452@fledge.watson.org> X-Mailer: VM 6.75 under 21.1 (patch 12) "Channel Islands" XEmacs Lucid Cc: arch@FreeBSD.org, net@FreeBSD.org Subject: Re: Changes in the network interface queueing handoff model X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 01 Aug 2006 13:37:24 -0000 Robert Watson writes: > > Jack Vogel at Intel has previously talked about having TSO patches for FreeBSD > to use with if_em, but was running into stability/correctness problems on 7.x. > I e-mailed him a few minutes ago to ask to take a look at the patches. Since > I've not yet seen them, I don't know the details of how they work -- I assume > that some amount of tweaking is required not just to TCP so that it passes > down larger segments, but so that larger segments are used in the right ways, > and in keeping with the facilities offered by the underlying interface, > especially before a routing decision has been made. I'm not sure about what stack changes are required for TSO. I do know that NetBSD has had TSO for roughly 2 years, so they might be a good place to look.. Drew