From owner-freebsd-net Sat Jul 8 22:50:25 2000 Delivered-To: freebsd-net@freebsd.org Received: from panzer.kdm.org (panzer.kdm.org [216.160.178.169]) by hub.freebsd.org (Postfix) with ESMTP id 0F1BF37C0BA for ; Sat, 8 Jul 2000 22:50:22 -0700 (PDT) (envelope-from ken@panzer.kdm.org) Received: (from ken@localhost) by panzer.kdm.org (8.9.3/8.9.1) id XAA12627; Sat, 8 Jul 2000 23:50:14 -0600 (MDT) (envelope-from ken) Date: Sat, 8 Jul 2000 23:50:14 -0600 From: "Kenneth D. Merry" To: Mike Silbersack Cc: net@FreeBSD.ORG Subject: Re: new zero copy sockets and NFS patches Message-ID: <20000708235014.A12542@panzer.kdm.org> References: <20000708232226.A12332@panzer.kdm.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2i In-Reply-To: ; from silby@silby.com on Sun, Jul 09, 2000 at 12:41:01AM -0500 Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On Sun, Jul 09, 2000 at 00:41:01 -0500, Mike Silbersack wrote: > On Sat, 8 Jul 2000, Kenneth D. Merry wrote: > > > http://people.FreeBSD.ORG/~ken/zero_copy/ > > > > Feedback would be very welcome, we haven't gotten much response on this > > yet. > > Please put up graphs showing the performance increase; it's difficult to > understand the results you've posted so far, which may explain the general > lack of excitement. True enough, graphs help. Check out this paper: http://www.cs.duke.edu/ari/publications/end-system.pdf It is linked off the Trapeze publications page: http://www.cs.duke.edu/ari/publications/publications.html The above paper covers the performance benefits of zero copy, checksum offloading, larger MTUs, etc., and includes several graphs demonstrating the effect of those optimizations. The zero copy code used there is pretty much the same as the patches above. Ken -- Kenneth Merry ken@kdm.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message