From owner-cvs-all Thu Dec 2 17:10:32 1999 Delivered-To: cvs-all@freebsd.org Received: from ind.alcatel.com (postal.xylan.com [208.8.0.248]) by hub.freebsd.org (Postfix) with ESMTP id 0CCCD14FC2; Thu, 2 Dec 1999 17:10:23 -0800 (PST) (envelope-from wes@softweyr.com) Received: from mailhub.xylan.com (mailhub [198.206.181.70]) by ind.alcatel.com (8.9.3+Sun/8.9.1 (ind.alcatel.com 3.0 [OUT])) with SMTP id RAA18703; Thu, 2 Dec 1999 17:09:50 -0800 (PST) X-Origination-Site: Received: from omni.xylan.com by mailhub.xylan.com (SMI-8.6/SMI-SVR4 (mailhub 2.1 [HUB])) id RAA28422; Thu, 2 Dec 1999 17:09:50 -0800 Received: from softweyr.com (dyn0.utah.xylan.com) by omni.xylan.com (4.1/SMI-4.1 (xylan engr [SPOOL])) id AA26317; Thu, 2 Dec 99 17:09:48 PST Message-Id: <38471864.7CFA54BF@softweyr.com> Date: Thu, 02 Dec 1999 18:09:56 -0700 From: Wes Peters Organization: Softweyr LLC X-Mailer: Mozilla 4.61 [en] (X11; I; FreeBSD 3.3-RELEASE i386) X-Accept-Language: en Mime-Version: 1.0 To: Archie Cobbs Cc: "Justin T. Gibbs" , cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/kern uipc_mbuf.c src/sys/sys mbuf.h References: <199912012327.PAA45003@bubba.whistle.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-cvs-all@FreeBSD.ORG Precedence: bulk Archie Cobbs wrote: > > Justin T. Gibbs writes: > > > > How does this work in a 0 copy system? > > Not sure what a '0 copy system' is.. One that doesn't copy anything, ala the Wind River "zbuf" interface. > Basically all it does is create a completely new mbuf chain containing > the same data as the original. Definitely at least 1 copy :-) Which sucks. Wasting time copying stuff around in memory is a great way to make your network stack slow. > You rarely need this, but 'ipfw tee' is one of those cases. Unless you can queue the same packet to multiple locations. ;^) -- "Where am I, and what am I doing in this handbasket?" Wes Peters Softweyr LLC wes@softweyr.com http://softweyr.com/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message