From owner-freebsd-hackers Thu Sep 27 7:16:40 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from whizzo.transsys.com (whizzo.TransSys.COM [144.202.42.10]) by hub.freebsd.org (Postfix) with ESMTP id B6C3937B405 for ; Thu, 27 Sep 2001 07:16:38 -0700 (PDT) Received: from whizzo.transsys.com (#6@localhost.transsys.com [127.0.0.1]) by whizzo.transsys.com (8.11.4/8.11.4) with ESMTP id f8REGaZ64624; Thu, 27 Sep 2001 10:16:36 -0400 (EDT) (envelope-from louie@whizzo.transsys.com) Message-Id: <200109271416.f8REGaZ64624@whizzo.transsys.com> X-Mailer: exmh version 2.5 07/13/2001 with nmh-1.0.4 To: Ronald G Minnich Cc: hackers@FreeBSD.ORG X-Image-URL: http://www.transsys.com/louie/images/louie-mail.jpg From: "Louis A. Mamakos" Subject: Re: TCP&IP cksum offload on FreeBSD 4.2 References: In-reply-to: Your message of "Thu, 27 Sep 2001 07:40:53 MDT." Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Thu, 27 Sep 2001 10:16:36 -0400 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 The other type of failure you might not catch are software errors; that is, where a packet is produced by the network stack and then is subsequently stomped on by a random store from some other code. Or a mis-programmed I/O card with scatter/gather capability doesn't pick up what was intended, etc. The Internet checksum is useful for detecting this class of error. Louis Mamakos To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message