From owner-freebsd-hackers Tue Jun 5 2:57: 5 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from newsguy.com (perry.pathlink.com [209.155.233.33]) by hub.freebsd.org (Postfix) with ESMTP id EF91D37B401 for ; Tue, 5 Jun 2001 02:56:58 -0700 (PDT) (envelope-from dcs@newsguy.com) Received: from newsguy.com (ppp045-bsace7001.telebrasilia.net.br [200.181.80.45]) by newsguy.com (8.11.0/8.9.1) with ESMTP id f559trq79032; Tue, 5 Jun 2001 02:55:54 -0700 (PDT) Message-ID: <3B1CACDA.96599BD5@newsguy.com> Date: Tue, 05 Jun 2001 06:56:42 -0300 From: "Daniel C. Sobral" X-Mailer: Mozilla 4.77 [en] (Win98; U) X-Accept-Language: en,pt-BR,pt,en-GB,en-US,ja MIME-Version: 1.0 To: Giorgos Keramidas Cc: Bob Willcox , Jesper Skriver , hackers list Subject: Re: How to disable software TCP checksumming? References: <20010529144114.I19771@luke.immure.com> <20010529221107.C49875@skriver.dk> <20010529155212.M19771@luke.immure.com> <20010530045200.A1031@hades.hell.gr> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Giorgos Keramidas wrote: > > There are good reasons why checksumming in upper layers should not be disabled > even if some lower layer does checksumming of its own. I recall reading some > good points on this one at "TCP/IP Illustrated, Volume I" from (now late) > Richard W. Stevens. It seems to me to be kind of moot to check the same value twice, unless you suspect hardware problems. Aren't you talking about two different checks over the same data instead of checksum off-loading? -- Daniel C. Sobral (8-DCS) dcs@newsguy.com dcs@freebsd.org capo@the.secret.bsdconspiracy.net wow regex humor... I'm a geek To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message